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A mental disorder, also referred to as a mental illness,[6] a mental health condition,[7] or a psychiatric disability,[2] is a behavioral or mental pattern that causes significant distress or impairment of personal functioning.[8] A mental disorder is also characterized by a clinically significant disturbance in an individual's cognition, emotional regulation, or behavior, often in a social context.[9][10] Such disturbances may occur as single episodes, may be persistent, or may be relapsing–remitting. There are many different types of mental disorders, with signs and symptoms that vary widely between specific disorders.[10][11] A mental disorder is one aspect of mental health. The causes of mental disorders are often unclear. Theories incorporate findings from a range of fields. Disorders may be associated with particular regions or functions of the brain. Disorders are usually diagnosed or assessed by a mental health professional, such as a clinical psychologist, psychiatrist, psychiatric nurse, or clinical social worker, using various methods such as psychometric tests, but often relying on observation and questioning. Cultural and religious beliefs, as well as social norms, should be taken into account when making a diagnosis.[12] Services for mental disorders are usually based in psychiatric hospitals, outpatient clinics, or in the community (in the United Kingdom). Treatments are provided by mental health professionals. Common treatment options are psychotherapy or psychiatric medication, while lifestyle changes, social interventions, peer support, and self-help are also options. In a minority of cases, there may be involuntary detention or treatment. Prevention programs have been shown to reduce depression.[10][13] In 2019, common mental disorders around the globe include: major depression, which affects about 264 million people; dementia, which affects about 50 million; bipolar disorder, which affects about 45 million; and schizophrenia and other psychoses, which affect about 20 million people.[10] Neurodevelopmental disorders include attention deficit hyperactivity disorder (ADHD), autism spectrum disorder (autism), and intellectual disability, of which onset occurs early in the developmental period.[14][10] Stigma and discrimination can add to the suffering and disability associated with mental disorders, leading to various social movements attempting to increase understanding and challenge social exclusion. Definition "Nervous breakdown" redirects here. For other uses, see Nervous breakdown (disambiguation). The definition and classification of mental disorders are key issues for researchers as well as service providers and those who may be diagnosed. For a mental state to be classified as a disorder, it generally needs to cause dysfunction.[15] Most international clinical documents use the term mental "disorder", while "illness" is also common. It has been noted that using the term "mental" (i.e., of the mind) is not necessarily meant to imply separateness from the brain or body. According to the fourth edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV), published in 1994, a mental disorder is a psychological syndrome or pattern that is associated with distress (e.g., via a painful symptom), disability (impairment in one or more important areas of functioning), increased risk of death, or causes a significant loss of autonomy; however, it excludes normal responses such as the grief from loss of a loved one and also excludes deviant behavior for political, religious, or societal reasons not arising from a dysfunction in the individual.[16] The DSM-IV definition states that, like many medical terms, mental disorder "lacks a consistent operational definition that covers all situations". It notes that different levels of abstraction can be used for medical definitions, including pathology, symptomology, deviance from a normal range, or etiology, and that the same is true for mental disorders, so that sometimes one type of definition is appropriate and sometimes another, depending on the situation.[17] In 2013, the American Psychiatric Association (APA) redefined mental disorders in the DSM-5 as "a syndrome characterized by clinically significant disturbance in an individual's cognition, emotion regulation, or behavior that reflects a dysfunction in the psychological, biological, or developmental processes underlying mental functioning."[18] The final draft of ICD-11 contains a very similar definition.[19] The terms "mental breakdown" or "nervous breakdown" may be used by the general population to mean a mental disorder.[20] The terms "nervous breakdown" and "mental breakdown" have not been formally defined through a medical diagnostic system such as the DSM-5 or ICD-10 and are nearly absent from scientific literature regarding mental illness.[21][22] Although "nervous breakdown" is not rigorously defined, surveys of laypersons suggest that the term refers to a specific acute time-limited reactive disorder involving symptoms such as anxiety or depression, usually precipitated by external stressors.[21] Many health experts today refer to a nervous breakdown as a mental health crisis.[23] Nervous illness This article contains too many or overly lengthy quotations. Please help summarize the quotations. Consider transferring direct quotations to Wikiquote or excerpts to Wikisource. (February 2026) (Learn how and when to remove this message) In addition to the concept of mental disorder, some people have argued for a return to the old-fashioned concept of nervous illness. In How Everyone Became Depressed: The Rise and Fall of the Nervous Breakdown (2013), Edward Shorter, a professor of psychiatry and the history of medicine, says: We have had nervous illness for centuries. When you are too nervous to function ... it is a nervous breakdown. But that term has vanished from medicine, although not from the way we speak.... The nervous patients of yesteryear are the depressives of today. That is the bad news.... There is a deeper illness that drives depression and the symptoms of mood. We can call this deeper illness something else, or invent a neologism, but we need to get the discussion off depression and onto this deeper disorder in the brain and body. That is the point. — Edward Shorter, the University of Toronto[24] In eliminating the nervous breakdown, psychiatry has come close to having its own nervous breakdown. — David Healy, MD, FRCPsych, Professor of Psychiatry, University of Cardiff, Wales[25] Nerves stand at the core of common mental illness, no matter how much we try to forget them. — Peter J. Tyrer, FMedSci, Professor of Community Psychiatry, Imperial College, London[26] Classifications Main article: Classification of mental disorders There are currently two widely established systems that classify mental disorders: International Classification of Diseases produced by the WHO. The latest edition is the ICD-11, which is in effect since 1 January 2022.[27] The ICD is a broad medical classification system; mental disorders are contained in Chapter 06: Mental, behavioural or neurodevelopmental disorders (06). Diagnostic and Statistical Manual of Mental Disorders produced by the American Psychiatric Association since 1952. The latest edition is the Fifth Edition, Text Revision (DSM-5-TR), which was released in 2022.[28] Both of these list categories of disorder and provide standardized criteria for diagnosis. They have deliberately converged their codes in recent revisions so that the manuals are often broadly comparable, although significant differences remain. Other classification schemes may be used in non-western cultures, for example, the Chinese Classification of Mental Disorders, and other manuals may be used by those of alternative theoretical persuasions, such as the Psychodynamic Diagnostic Manual. In general, mental disorders are classified separately from neurological disorders, learning disabilities or intellectual disability. Unlike the DSM and ICD, some approaches are not based on identifying distinct categories of disorder using dichotomous symptom profiles intended to separate the abnormal from the normal. There is significant scientific debate about the relative merits of categorical versus such non-categorical (or hybrid) schemes, also known as continuum or dimensional models. A spectrum approach may incorporate elements of both. In the scientific and academic literature on the definition or classification of mental disorder, one extreme argues that it is entirely a matter of value judgements (including of what is normal) while another proposes that it is or could be entirely objective and scientific (including by reference to statistical norms).[29] Common hybrid views argue that the concept of mental disorder is objective even if only a "fuzzy prototype" that can never be precisely defined, or conversely that the concept always involves a mixture of scientific facts and subjective value judgments.[30] Although the diagnostic categories are referred to as 'disorders', they are presented as medical diseases, but are not validated in the same way as most medical diagnoses. Some neurologists argue that classification will only be reliable and valid when based on neurobiological features rather than clinical interview, while others suggest that the differing ideological and practical perspectives need to be better integrated.[31][32] The DSM and ICD approach remains under attack both because of the implied causality model[33] and because some researchers believe it better to aim at underlying brain differences which can precede symptoms by many years.[34] Dimensional models The high degree of comorbidity between disorders in categorical models such as the DSM and ICD have led some to propose dimensional models. Studying comorbidity between disorders have demonstrated two latent (unobserved) factors or dimensions in the structure of mental disorders that are thought to possibly reflect etiological processes. These two dimensions reflect a distinction between internalizing disorders, such as mood or anxiety symptoms, and externalizing disorders such as behavioral or substance use symptoms.[35] A single general factor of psychopathology, similar to the g factor for intelligence, has been empirically supported. The p factor model supports the internalizing-externalizing distinction, but also supports the formation of a third dimension of thought disorders such as schizophrenia.[36] Biological evidence also supports the validity of the internalizing-externalizing structure of mental disorders, with twin and adoption studies supporting heritable factors for externalizing and internalizing disorders.[37][38][39] A leading dimensional model is the Hierarchical Taxonomy of Psychopathology. Disorders See also: List of mental disorders There are many different categories of mental disorder, and many different facets of human behavior and personality that can become disordered.[40][41][42][43] Anxiety disorders Main article: Anxiety disorder An anxiety disorder is anxiety or fear that interferes with normal functioning.[41] Commonly recognized categories include specific phobias, generalized anxiety disorder, social anxiety disorder, panic disorder, agoraphobia, and post-traumatic stress disorder. Obsessive–compulsive disorder was categorized as an anxiety disorder in DSM-III, which was published in 1980, but was later placed in its own section called "Obsessive-Compulsive and Related Disorder" in DSM-5.[44] Mood disorders Main article: Mood disorder Other affective (emotion/mood) processes can also become disordered. Mood disorder involving unusually intense and sustained sadness, melancholia, or despair is known as major depression (also known as unipolar or clinical depression). Milder, but still prolonged depression, can be diagnosed as dysthymia. Bipolar disorder (also known as manic depression) involves abnormally "high" or pressured mood states, known as mania or hypomania, alternating with normal or depressed moods. The extent to which unipolar and bipolar mood phenomena represent distinct categories of disorder, or mix and merge along a dimension or spectrum of mood, is subject to some scientific debate.[45][46] Psychotic disorders Main article: Psychotic disorder Patterns of belief, language use and perception of reality can become dysregulated (e.g., delusions, thought disorder, hallucinations). Psychotic disorders in this domain include schizophrenia, and delusional disorder. Schizoaffective disorder is a category used for individuals showing aspects of both schizophrenia and affective disorders. Schizotypy is a category used for individuals showing some of the characteristics associated with schizophrenia, but without meeting cutoff criteria.[citation needed] Personality disorders This section is an excerpt from Personality disorder.[edit] A personality disorder (PD) is a mental disorder characterized by an enduring and pervasive maladaptive pattern of behavior, emotions, cognition, and inner experience, deviating from social norms.[47][48] As a common feature, this manifests in significant impairment in interpersonal relationships and various aspects of functioning of the self, such as self-concept,[49] in conjunction with pathological personality traits.[50] These patterns develop early, are inflexible, and are associated with significant distress or disability.[48] There are both dimensional and categorical approaches to the classification of personality disorders, with the former being implemented in the International Classification of Diseases (ICD), whereas the main model in the Diagnostic and Statistical Manual of Mental Disorders (DSM) is categorical;[48] moreover, the Alternative DSM-5 model for personality disorders (AMPD) combines the two into a hybrid model.[51] In accordance with the categorical approach, personality disorders are viewed as distinct types, such as avoidant or narcissistic; on the other hand, the dimensional systems employed in the ICD-11 and AMPD rate severity and pathological traits.[51] Neurodevelopmental disorders This section is an excerpt from Neurodevelopmental disorder.[edit] Neurodevelopmental disorders are a group of mental disorders causatively related to maldevelopment of the nervous system, which includes the brain and spinal cord[citation needed]. According to the American Psychiatric Association's Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) published in 2013, these conditions generally appear in early childhood, usually before children start school, and can persist into adulthood.[52] The key characteristic of all these disorders is that they negatively impact a person's functioning in one or more domains of life (personal, social, academic, occupational) depending on the disorder and deficits it has caused. All of these disorders and their levels of impairment exist on a spectrum, and affected individuals can experience varying degrees of symptoms and deficits, despite having the same diagnosis.[52][53] Some causes can contribute to these disorders, such as genetic factors (genetics, family medical history),[54] environmental factors (excessive stress, exposure to neurotoxins, pollution, viral infections, bacterial infections),[55][56] physical factors (traumatic brain injury, illness),[57] and prenatal factors (birth defects, exposure to drugs during pregnancy, low birth weight).[58] Neurodevelopmental disorders can be managed with behavioral therapy, applied behavior analysis (ABA), educational interventions, specific medications, and other such treatments.[59] The DSM-5 classifies neurodevelopmental disorders into six overarching groups: intellectual, communication, autism, attention deficit hyperactivity disorder, motor, and specific learning disorders.[52] Often one disorder is accompanied by another.[53] Eating disorders This section is an excerpt from Eating disorder.[edit] An eating disorder (ED) is a mental disorder defined by abnormal eating behaviors that adversely affect a person's physical or mental health.[60] These behaviors may include eating too much food or too little food, as well as body image issues. Types of eating disorders include binge eating disorder, where the person suffering keeps eating large amounts in a short period of time typically while not being hungry, often leading to weight gain; anorexia nervosa, where the person has an intense fear of gaining weight, thus restricts food and/or overexercises to manage this fear; bulimia nervosa, where individuals eat a large quantity (binging) then try to rid themselves of the food (purging), in an attempt to not gain any weight; pica, where the patient eats non-food items; rumination syndrome, where the patient regurgitates undigested or minimally digested food; avoidant/restrictive food intake disorder (ARFID), where people have a reduced or selective food intake due to some psychological reasons; and a group of other specified feeding or eating disorders.[60] Anxiety disorders, depression and substance abuse are common among people with eating disorders.[61] These disorders do not include obesity.[60] People often experience comorbidity between an eating disorder and OCD.[62] Sleep disorders Main article: Sleep disorder Sleep disorders are associated with disruption to normal sleep patterns. A common sleep disorder is insomnia, which is described as difficulty falling and/or staying asleep. Other sleep disorders include narcolepsy, sleep apnea, REM sleep behavior disorder, chronic sleep deprivation, and restless leg syndrome. Narcolepsy is a condition of extreme tendencies to fall asleep whenever and wherever. People with narcolepsy feel refreshed after their random sleep, but eventually get sleepy again. Narcolepsy diagnosis requires an overnight stay at a sleep center for analysis, during which doctors ask for a detailed sleep history and sleep records. Doctors also use actigraphs and polysomnography.[63] Doctors will do a multiple sleep latency test, which measures how long it takes a person to fall asleep.[63] Sleep apnea, when breathing repeatedly stops and starts during sleep, can be a serious sleep disorder. Three types of sleep apnea include obstructive sleep apnea, central sleep apnea, and complex sleep apnea.[64] Sleep apnea can be diagnosed at home or with polysomnography at a sleep center. An ear, nose, and throat doctor may further help with the sleeping habits. Sexuality related Sexual disorders include dyspareunia and various kinds of paraphilia (sexual arousal to objects, situations, or individuals that are considered abnormal or harmful to the person or others).[citation needed] Other Impulse control disorders: People who are abnormally unable to resist certain urges or impulses that could be harmful to themselves or others, may be classified as having an impulse control disorder, and disorders such as kleptomania (stealing) or pyromania (fire-setting). Various behavioral addictions, such as gambling addiction, may be classed as a disorder.[citation needed] Substance use disorders: This disorder refers to the use of drugs (legal or illegal, including alcohol) that persists despite significant problems or harm related to its use. Substance dependence and substance abuse fall under this umbrella category in the DSM. Substance use disorder may be due to a pattern of compulsive and repetitive use of a drug that results in tolerance to its effects and withdrawal symptoms when use is reduced or stopped.[citation needed] Dissociative disorders: People with severe disturbances of their self-identity, memory, and general awareness of themselves and their surroundings may be classified as having these types of disorders, including depersonalization-derealization disorder or dissociative identity disorder (which was previously referred to as multiple personality disorder or "split personality").[citation needed] Cognitive disorders: These affect cognitive abilities, including learning and memory. This category includes delirium and mild and major neurocognitive disorder (previously termed dementia).[citation needed] Somatoform disorders may be diagnosed when there are problems that appear to originate in the body that are thought to be manifestations of a mental disorder. This includes somatization disorder and conversion disorder. There are also disorders of how a person perceives their body, such as body dysmorphic disorder. Neurasthenia is an old diagnosis involving somatic complaints as well as fatigue and low spirits/depression, which is officially recognized by the ICD-10 but no longer by the DSM-IV.[65][non-primary source needed] Factitious disorders are diagnosed where symptoms are thought to be reported for personal gain. Symptoms are often deliberately produced or feigned, and may relate to either symptoms in the individual or in someone close to them, particularly people they care for.[citation needed] There are attempts to introduce a category of relational disorder, where the diagnosis is of a relationship rather than on any one individual in that relationship. The relationship may be between children and their parents, between couples, or others. There already exists, under the category of psychosis, a diagnosis of shared psychotic disorder where two or more individuals share a particular delusion because of their close relationship with each other.[citation needed] There are a number of uncommon psychiatric syndromes, which are often named after the person who first described them, such as Capgras syndrome, De Clerambault syndrome, Othello syndrome, Ganser syndrome, Cotard delusion, and Ekbom syndrome, and additional disorders such as the Couvade syndrome and Geschwind syndrome.[66] Signs and symptoms Course The onset of psychiatric disorders usually occurs from childhood to early adulthood.[67] Impulse-control disorders and a few anxiety disorders tend to appear in childhood. Some other anxiety disorders, substance disorders, and mood disorders emerge later in the mid-teens.[68] Symptoms of schizophrenia typically manifest from late adolescence to early twenties.[69] The likely course and outcome of mental disorders vary and are dependent on numerous factors related to the disorder itself, the individual as a whole, and the social environment. Some disorders may last a brief period of time, while others may be long-term in nature. All disorders can have a varied course. Long-term international studies of schizophrenia have found that over a half of individuals recover in terms of symptoms, and around a fifth to a third in terms of symptoms and functioning, with many requiring no medication. While some have serious difficulties and support needs for many years, "late" recovery is still plausible. The World Health Organization (WHO) concluded that the long-term studies' findings converged with others in "relieving patients, carers and clinicians of the chronicity paradigm which dominated thinking throughout much of the 20th century."[70][non-primary source needed][71] A follow-up study by Tohen and coworkers revealed that around half of people initially diagnosed with bipolar disorder achieve symptomatic recovery (no longer meeting criteria for the diagnosis) within six weeks, and nearly all achieve it within two years, with nearly half regaining their prior occupational and residential status in that period. Less than half go on to experience a new episode of mania or major depression within the next two years.[72][non-primary source needed] Disability Disorder Disability-adjusted life years[73] Major depressive disorder 65.5 million Alcohol-use disorder 23.7 million Schizophrenia 16.8 million Bipolar disorder 14.4 million Other drug-use disorders 8.4 million Panic disorder 7.0 million Obsessive-compulsive disorder 5.1 million Primary insomnia 3.6 million Post-traumatic stress disorder 3.5 million Some disorders may be very limited in their functional effects, while others may involve substantial disability and support needs. In this context, the terms psychiatric disability and psychological disability are sometimes used instead of mental disorder.[2][3] The degree of ability or disability may vary over time and across different life domains. Furthermore, psychiatric disability has been linked to institutionalization, discrimination and social exclusion as well as to the inherent effects of disorders. Alternatively, functioning may be affected by the stress of having to hide a condition in work or school, etc., by adverse effects of medications or other substances, or by mismatches between illness-related variations and demands for regularity.[74] It is also the case that, while often being characterized in purely negative terms, some mental traits or states labeled as psychiatric disabilities can also involve above-average creativity, non-conformity, goal-striving, meticulousness, or empathy.[75] In addition, the public perception of the level of disability associated with mental disorders can change.[76] Nevertheless, internationally, people report equal or greater disability from commonly occurring mental conditions than from commonly occurring physical conditions, particularly in their social roles and personal relationships. The proportion with access to professional help for mental disorders is far lower, however, even among those assessed as having a severe psychiatric disability.[77] Disability in this context may or may not involve such things as: Basic activities of daily living. Including looking after the self (health care, grooming, dressing, shopping, cooking etc.) or looking after accommodation (chores, DIY tasks, etc.) Interpersonal relationships. Including communication skills, ability to form relationships and sustain them, ability to leave the home or mix in crowds or particular settings Occupational functioning. Ability to acquire an employment and hold it, cognitive and social skills required for the job, dealing with workplace culture, or studying as a student. In terms of total disability-adjusted life years (DALYs), which is an estimate of how many years of life are lost due to premature death or to being in a state of poor health and disability, psychiatric disabilities rank amongst the most disabling conditions. Unipolar depressive disorder (also known as major depressive disorder) is the third leading cause of disability worldwide, of any condition mental or physical, accounting for 65.5 million years lost. The first systematic description of global disability arising in youth, in 2011, found that among 10- to 24-year-olds nearly half of all disability (current and as estimated to continue) was due to psychiatric disabilities, including substance use disorders and conditions involving self-harm. Second to this were accidental injuries (mainly traffic collisions) accounting for 12 percent of disability, followed by communicable diseases at 10 percent. The psychiatric disabilities associated with most disabilities in high-income countries were unipolar major depression (20%) and alcohol use disorder (11%). In the eastern Mediterranean region, it was unipolar major depression (12%) and schizophrenia (7%), and in Africa it was unipolar major depression (7%) and bipolar disorder (5%).[78] Suicide, which is often attributed to some underlying mental disorder, is a leading cause of death among teenagers and adults under 35.[79][80] There are an estimated 10 to 20 million non-fatal attempted suicides every year worldwide.[81] Risk factors Main article: Causes of mental disorders The predominant view as of 2018 is that genetic, psychological, and environmental factors all contribute to the development or progression of mental disorders.[82] Different risk factors may be present at different ages, with risk occurring as early as during prenatal period.[83] Genetics Main article: Psychiatric genetics A number of psychiatric disorders are linked to a family history (including depression, narcissistic personality disorder[84][85] and anxiety).[86] Twin studies have also revealed a very high heritability for many mental disorders (especially autism and schizophrenia).[87] Although researchers have been looking for decades for clear linkages between genetics and mental disorders, that work has not yielded specific genetic biomarkers yet that might lead to better diagnosis and better treatments.[88] Statistical research looking at eleven disorders found widespread assortative mating between people with mental illness. That means that individuals with one of these disorders were two to three times more likely than the general population to have a partner with a mental disorder. Sometimes people seemed to have preferred partners with the same mental illness. Thus, people with schizophrenia or ADHD are seven times more likely to have affected partners with the same disorder. This is even more pronounced for people with autism who are 10 times more likely to have a spouse with the same disorder.[89] Environment Main article: Brain health and pollution The prevalence of mental illness is higher in more economically unequal countries. During the prenatal stage, factors like unwanted pregnancy, lack of adaptation to pregnancy or substance use during pregnancy increases the risk of developing a mental disorder.[83] Maternal stress and birth complications including prematurity and infections have also been implicated in increasing susceptibility for mental illness.[90] Infants neglected or not provided optimal nutrition have a higher risk of developing cognitive impairment.[83] Social influences have also been found to be important,[91] including abuse, neglect, bullying, social stress, traumatic events, and other negative or overwhelming life experiences. Aspects of the wider community have also been implicated,[92] including employment problems, socioeconomic inequality, lack of social cohesion, problems linked to migration, and features of particular societies and cultures. The specific risks and pathways to particular disorders are less clear, however. Nutrition also plays a role in mental disorders.[10][93] In schizophrenia and psychosis, risk factors include migration and discrimination, childhood trauma, bereavement or separation in families, recreational use of drugs,[94] and urbanicity.[92] In anxiety, risk factors may include parenting factors including parental rejection, lack of parental warmth, high hostility, harsh discipline, high maternal negative affect, anxious childrearing, modelling of dysfunctional and drug-abusing behavior, and child abuse (emotional, physical and sexual).[95] Adults with imbalance work to life are at higher risk for developing anxiety.[83] For bipolar disorder, stress (such as childhood adversity) is not a specific cause, but does place genetically and biologically vulnerable individuals at risk for a more severe course of illness.[96] Drug use Mental disorders are associated with drug use including: cannabis,[97] alcohol[98] and caffeine,[99] use of which appears to promote anxiety.[100] For psychosis and schizophrenia, usage of a number of drugs has been associated with development of the disorder, including cannabis, cocaine, and amphetamines.[101][97] There has been debate regarding the relationship between usage of cannabis and bipolar disorder.[102] Cannabis has also been associated with depression.[97] Adolescents are at increased risk for tobacco, alcohol and drug use; Peer pressure is the main reason why adolescents start using substances. At this age, the use of substances could be detrimental to the development of the brain and place them at higher risk of developing a mental disorder.[83] Chronic disease People living with chronic conditions like HIV and diabetes are at higher risk of developing a mental disorder. People living with diabetes experience significant stress from the biological impact of the disease, which places them at risk for developing anxiety and depression. Diabetic patients also have to deal with emotional stress trying to manage the disease. Conditions like heart disease, stroke, respiratory conditions, cancer, and arthritis increase the risk of developing a mental disorder when compared to the general population.[103] Personality traits Risk factors for mental illness include a propensity for high neuroticism[104][105] or "emotional instability". In anxiety, risk factors may include temperament and attitudes (e.g. pessimism).[86] Causal models Mental disorders can arise from multiple sources, and in many cases there is no single accepted or consistent cause currently established. An eclectic or pluralistic mix of models may be used to explain particular disorders.[105][106] The primary paradigm of contemporary mainstream Western psychiatry is said to be the biopsychosocial model, which incorporates biological, psychological and social factors, although this may not always be applied in practice. Biological psychiatry follows a biomedical model where many mental disorders are conceptualized as disorders of brain circuits likely caused by developmental processes shaped by a complex interplay of genetics and experience. A common assumption is that disorders may have resulted from genetic and developmental vulnerabilities, exposed by stress in life (for example in a diathesis–stress model), although there are various views on what causes differences between individuals. Some types of mental disorders may be viewed as primarily neurodevelopmental disorders.[citation needed] A distinction is sometimes made between a "medical model" or a "social model" of psychiatric disability.[107] Diagnosis Psychiatrists seek to provide a medical diagnosis of individuals by an assessment of symptoms, signs and impairment associated with particular types of mental disorder. Other mental health professionals, such as clinical psychologists, may or may not apply the same diagnostic categories to their clinical formulation of a client's difficulties and circumstances.[108] The majority of mental health problems are, at least initially, assessed and treated by family physicians (in the UK general practitioners) during consultations, who may refer a patient on for more specialist diagnosis in acute or chronic cases. Routine diagnostic practice in mental health services typically involves an interview known as a mental status examination, where evaluations are made of appearance and behavior, self-reported symptoms, mental health history, and current life circumstances. The views of other professionals, relatives, or other third parties may be taken into account. A physical examination to check for ill health or the effects of medications or other drugs may be conducted. Psychological testing is sometimes used via paper-and-pen or computerized questionnaires, which may include algorithms based on ticking off standardized diagnostic criteria, and in rare specialist cases neuroimaging tests may be requested, but such methods are more commonly found in research studies than routine clinical practice.[109][110] Time and budgetary constraints often limit practicing psychiatrists from conducting more thorough diagnostic evaluations.[111] It has been found that most clinicians evaluate patients using an unstructured, open-ended approach, with limited training in evidence-based assessment methods, and that inaccurate diagnosis may be common in routine practice.[112] In addition, comorbidity is very common in psychiatric diagnosis, where the same person meets the criteria for more than one disorder. On the other hand, a person may have several different difficulties only some of which meet the criteria for being diagnosed. There may be specific problems with accurate diagnosis in developing countries. More structured approaches are being increasingly used to measure levels of mental illness. HoNOS is the most widely used measure in English mental health services, being used by at least 61 trusts.[113] In HoNOS a score of 0–4 is given for each of 12 factors, based on functional living capacity.[114] Research has been supportive of HoNOS,[115] although some questions have been asked about whether it provides adequate coverage of the range and complexity of mental illness problems, and whether the fact that often only 3 of the 12 scales vary over time gives enough subtlety to accurately measure outcomes of treatment.[116] Criticism icon This section relies excessively on references to primary sources. Please improve this section by adding secondary or tertiary sources. Find sources: "criticism" psychiatric diagnosis – news · newspapers · books · scholar · JSTOR (July 2021) (Learn how and when to remove this message) Since the 1980s, Paula Caplan has been concerned about the subjectivity of psychiatric diagnosis, and people being arbitrarily "slapped with a psychiatric label." Caplan says because psychiatric diagnosis is unregulated, doctors are not required to spend much time interviewing patients or to seek a second opinion. The Diagnostic and Statistical Manual of Mental Disorders can lead a psychiatrist to focus on narrow checklists of symptoms, with little consideration of what is actually causing the person's problems. So, according to Caplan, getting a psychiatric diagnosis and label often stands in the way of recovery.[117] In 2013, psychiatrist Allen Frances wrote a paper entitled "The New Crisis of Confidence in Psychiatric Diagnosis", which said that "psychiatric diagnosis... still relies exclusively on fallible subjective judgments rather than objective biological tests." Frances was also concerned about "unpredictable overdiagnosis."[118] For many years, marginalized psychiatrists (such as Peter Breggin, Thomas Szasz) and outside critics (such as Stuart A. Kirk) have "been accusing psychiatry of engaging in the systematic medicalization of normality." More recently these concerns have come from insiders who have worked for and promoted the American Psychiatric Association (e.g., Robert Spitzer, Allen Frances).[119] A 2002 editorial in the British Medical Journal warned of inappropriate medicalization leading to disease mongering, where the boundaries of the definition of illnesses are expanded to include personal problems as medical problems or risks of diseases are emphasized to broaden the market for medications.[120] Gary Greenberg, a psychoanalyst, in his book "the Book of Woe", argues that mental illness is really about suffering and how the DSM creates diagnostic labels to categorize people's suffering.[121] Indeed, the psychiatrist Thomas Szasz, in his book "the Medicalization of Everyday Life", also argues that what is psychiatric illness, is not always biological in nature (i.e. social problems, poverty, etc.), and may even be a part of the human condition.[122] Potential routine use of MRI/fMRI in diagnosis in 2018 the American Psychological Association commissioned a review to reach a consensus on whether modern clinical MRI/fMRI will be able to be used in the diagnosis of mental health disorders. The criteria presented by the APA stated that the biomarkers used in diagnosis should: "have a sensitivity of at least 80% for detecting a particular psychiatric disorder" should "have a specificity of at least 80% for distinguishing this disorder from other psychiatric or medical disorders" "should be reliable, reproducible, and ideally be noninvasive, simple to perform, and inexpensive" proposed biomarkers should be verified by 2 independent studies each by a different investigator and different population samples and published in a peer-reviewed journal. The review concluded that although neuroimaging diagnosis may technically be feasible, very large studies are needed to evaluate specific biomarkers which were not available.[123] Prevention Main article: Prevention of mental disorders The 2004 WHO report "Prevention of Mental Disorders" stated that "Prevention of these disorders is obviously one of the most effective ways to reduce the [disease] burden."[124] The 2011 European Psychiatric Association (EPA) guidance on prevention of mental disorders states "There is considerable evidence that various psychiatric conditions can be prevented through the implementation of effective evidence-based interventions."[125] A 2011 UK Department of Health report on the economic case for mental health promotion and mental illness prevention found that "many interventions are outstandingly good value for money, low in cost and often become self-financing over time, saving public expenditure".[126] In 2016, the National Institute of Mental Health re-affirmed prevention as a research priority area.[127] Parenting may affect the child's mental health, and evidence suggests that helping parents to be more effective with their children can address mental health needs.[128][129][130] Universal prevention (aimed at a population that has no increased risk for developing a mental disorder, such as school programs or mass media campaigns) need very high numbers of people to show effect (sometimes known as the "power" problem). Approaches to overcome this are (1) focus on high-incidence groups (e.g. by targeting groups with high risk factors), (2) use multiple interventions to achieve greater, and thus more statistically valid, effects, (3) use cumulative meta-analyses of many trials, and (4) run very large trials.[131][132] Management Main articles: Treatment of mental disorders, Services for mental disorders, and Mental health professional The "Haus Tornow am See" (former manor house) in Germany from 1912 is today separated into a special education school and a hotel with integrated work/job- and rehabilitation-training for people with mental disorders. Treatment and support for mental disorders are provided in psychiatric hospitals, clinics or a range of community mental health services. In some countries services are increasingly based on a recovery approach, intended to support individuals' personal journey to gain the kind of life they want. There is a range of different types of treatment and what is most suitable depends on the disorder and the individual. Many things have been found to help at least some people, and a placebo effect may play a role in any intervention or medication. In a minority of cases, individuals may be treated against their will, which can cause particular difficulties depending on how it is carried out and perceived. Compulsory treatment while in the community versus non-compulsory treatment does not appear to make much of a difference except by maybe decreasing victimization.[133] Lifestyle Lifestyle strategies, including dietary changes, exercise and quitting smoking may be of benefit.[13][93][134] Therapy There is also a wide range of psychotherapists (including family therapists), counselors, and public health professionals. In addition, there are peer support roles where personal experience of similar issues is the primary source of expertise.[135][136][137][138] A major option for many mental disorders is psychotherapy. There are several main types. Cognitive behavioral therapy (CBT) is widely used and is based on modifying the patterns of thought and behavior associated with a particular disorder. Other psychotherapies include dialectic behavioral therapy (DBT) and interpersonal psychotherapy (IPT). Psychoanalysis, addressing underlying psychic conflicts and defenses, has been a dominant school of psychotherapy and is still in use. Systemic therapy or family therapy is sometimes used, addressing a network of significant others as well as an individual. Some psychotherapies are based on a humanistic approach. There are many specific therapies used for particular disorders, which may be offshoots or hybrids of the above types. Mental health professionals often employ an eclectic or integrative approach. Much may depend on the therapeutic relationship, and there may be problems with trust, confidentiality and engagement. Medication

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  A   mental disorder , also referred to as a   mental illness , [ 6 ]   a   mental health condition , [ 7 ]   or a   psychiatric disability , [ 2 ]   is a behavioral or mental pattern that causes significant distress or impairment of personal functioning. [ 8 ]   A mental disorder is also characterized by a   clinically significant   disturbance in an individual's cognition, emotional regulation, or behavior, often in a   social context . [ 9 ] [ 10 ]  Such disturbances may occur as single episodes, may be persistent, or may be   relapsing–remitting . There are many different types of mental disorders, with   signs and symptoms   that vary widely between specific disorders. [ 10 ] [ 11 ]   A mental disorder is one aspect of   mental health . The  causes of mental disorders  are often unclear. Theories incorporate findings from a range of fields. Disorders may be associated with particula...
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