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Key facts
- 1 in every 8 people in the world live with a mental disorder
- Mental disorders involve significant disturbances in thinking, emotional regulation, or behaviour
- There are many different types of mental disorders
- Effective prevention and treatment options exist
- Most people do not have access to effective care
Anxiety Disorders
In 2019, 301 million people were living with an anxiety disorder including 58 million children and adolescents (1). Anxiety disorders are characterised by excessive fear and worry and related behavioural disturbances. Symptoms are severe enough to result in significant distress or significant impairment in functioning. There are several different kinds of anxiety disorders, such as: generalised anxiety disorder (characterised by excessive worry), panic disorder (characterised by panic attacks), social anxiety disorder (characterised by excessive fear and worry in social situations), separation anxiety disorder (characterised by excessive fear or anxiety about separation from those individuals to whom the person has a deep emotional bond), and others. Effective psychological treatment exists, and depending on the age and severity, medication may also be considered.
Depression
In 2019, 280 million people were living with depression, including 23 million children and adolescents (1). Depression is different from usual mood fluctuations and short-lived emotional responses to challenges in everyday life. During a depressive episode, the person experiences depressed mood (feeling sad, irritable, empty) or a loss of pleasure or interest in activities, for most of the day, nearly every day, for at least two weeks. Several other symptoms are also present, which may include poor concentration, feelings of excessive guilt or low self-worth, hopelessness about the future, thoughts about dying or suicide, disrupted sleep, changes in appetite or weight, and feeling especially tired or low in energy. People with depression are at an increased risk of suicide. Yet, effective psychological treatment exists, and depending on the age and severity, medication may also be considered.
Bipolar Disorder
In 2019, 40 million people experienced bipolar disorder (1). People with bipolar disorder experience alternating depressive episodes with periods of manic symptoms. During a depressive episode, the person experiences depressed mood (feeling sad, irritable, empty) or a loss of pleasure or interest in activities, for most of the day, nearly every day. Manic symptoms may include euphoria or irritability, increased activity or energy, and other symptoms such as increased talkativeness, racing thoughts, increased self-esteem, decreased need for sleep, distractibility, and impulsive reckless behaviour. People with bipolar disorder are at an increased risk of suicide. Yet effective treatment options exist including psychoeducation, reduction of stress and strengthening of social functioning, and medication.
Post-Traumatic Stress Disorder (PTSD)
The prevalence of PTSD and other mental disorders is high in conflict-affected settings (3). PTSD may develop following exposure to an extremely threatening or horrific event or series of events. It is characterised by all of the following: 1) re-experiencing the traumatic event or events in the present (intrusive memories, flashbacks, or nightmares); 2) avoidance of thoughts and memories of the event(s), or avoidance of activities, situations, or people reminiscent of the event(s); and 3) persistent perceptions of heightened current threat. These symptoms persist for at least several weeks and cause significant impairment in functioning. Effective psychological treatment exists.
Schizophrenia
Schizophrenia affects approximately 24 million people or 1 in 300 people worldwide (1). People with schizophrenia have a life expectancy 10-20 years below that of the general population (4). Schizophrenia is characterised by significant impairments in perception and changes in behaviour. Symptoms may include persistent delusions, hallucinations, disorganised thinking, highly disorganised behaviour, or extreme agitation. People with schizophrenia may experience persistent difficulties with their cognitive functioning. Yet, a range of effective treatment options exist, including medication, psychoeducation, family interventions, and psychosocial rehabilitation.
Eating Disorders
In 2019, 14 million people experienced eating disorders including almost 3 million children and adolescents (1). Eating disorders, such as anorexia nervosa and bulimia nervosa, involve abnormal eating and preoccupation with food as well as prominent body weight and shape concerns. The symptoms or behaviours result in significant risk or damage to health, significant distress, or significant impairment of functioning. Anorexia nervosa often has its onset during adolescence or early adulthood and is associated with premature death due to medical complications or suicide. Individuals with bulimia nervosa are at a significantly increased risk for substance use, suicidality, and health complications. Effective treatment options exist, including family-based treatment and cognitive-based therapy.
Disruptive behaviour and dissocial disorders
40 million people, including children and adolescents, were living with conduct-dissocial disorder in 2019 (1). This disorder, also known as conduct disorder, is one of two disruptive behaviour and dissocial disorders, the other is oppositional defiant disorder. Disruptive behaviour and dissocial disorders are characterised by persistent behaviour problems such as persistently defiant or disobedient to behaviours that persistently violate the basic rights of others or major age-appropriate societal norms, rules, or laws. Onset of disruptive and dissocial disorders, is commonly, though not always, during childhood. Effective psychological treatments exist, often involving parents, caregivers, and teachers, cognitive problem-solving or social skills training.
Neurodevelopmental disorders
Neurodevelopmental disorders are behavioural and cognitive disorders, that? arise during the developmental period, and involve significant difficulties in the acquisition and execution of specific intellectual, motor, language, or social functions.
Neurodevelopmental disorders include disorders of intellectual development, autism spectrum disorder, and attention deficit hyperactivity disorder (ADHD) amongst others. ADHD is characterised by a persistent pattern of inattention and/or hyperactivity-impulsivity that has a direct negative impact on academic, occupational, or social functioning. Disorders of intellectual development are characterised by significant limitations in intellectual functioning and adaptive behaviour, which refers to difficulties with everyday conceptual, social, and practical skills that are performed in daily life. Autism spectrum disorder (ASD) constitutes a diverse group of conditions characterised by some degree of difficulty with social communication and reciprocal social interaction, as well as persistent restricted, repetitive, and inflexible patterns of behaviour, interests, or activities.
Effective treatment options exist including psychosocial interventions, behavioural interventions, occupational and speech therapy. For certain diagnoses and age groups, medication may also be considered.
Who is at risk from developing a mental disorder?
At any one time, a diverse set of individual, family, community, and structural factors may combine to protect or undermine mental health. Although most people are resilient, people who are exposed to adverse circumstances – including poverty, violence, disability, and inequality – are at higher risk. Protective and risk factors include individual psychological and biological factors, such as emotional skills as well as genetics. Many of the risk and protective factors are influenced through changes in brain structure and/or function.
Determining which mental illness you have
Sometimes it’s difficult to find out which mental illness may be causing your symptoms. But taking the time and effort to get an accurate diagnosis will help determine the appropriate treatment. The more information you have, the more you will be prepared to work with your mental health professional in understanding what your symptoms may represent.
The defining symptoms for each mental illness are detailed in the Diagnostic and Statistical Manual of Mental Disorders (DSM-5), published by the American Psychiatric Association. This manual is used by mental health professionals to diagnose mental conditions and by insurance companies to reimburse for treatment.
- somatic symptom disorder, illness anxiety disorder and factitious disorder.
- Feeding and eating disorders. These disorders include disturbances related to eating that impact nutrition and health, such as anorexia nervosa and binge-eating disorder.
- Elimination disorders. These disorders relate to the inappropriate elimination of urine or stool by accident or on purpose. Bed-wetting (enuresis) is an example.
- Sleep-wake disorders. These are disorders of sleep severe enough to require clinical attention, such as insomnia, sleep apnea and restless legs syndrome.
- Sexual dysfunctions. These include disorders of sexual response, such as premature ejaculation and female orgasmic disorder.
- Gender dysphoria. This refers to the distress that accompanies a person’s stated desire to be another gender.
- Disruptive, impulse-control and conduct disorders. These disorders include problems with emotional and behavioral self-control, such as kleptomania or intermittent explosive disorder.
- Substance-related and addictive disorders. These include problems associated with the excessive use of alcohol, caffeine, tobacco and drugs. This class also includes gambling disorder.
- Neurocognitive disorders. Neurocognitive disorders affect your ability to think and reason. These acquired (rather than developmental) cognitive problems include delirium, as well as neurocognitive disorders due to conditions or diseases such as traumatic brain injury or Alzheimer’s disease.
- Personality disorders. A personality disorder involves a lasting pattern of emotional instability and unhealthy behavior that causes problems in your life and relationships. Examples include borderline, antisocial and narcissistic personality disorders.
- Paraphilic disorders. These disorders include sexual interest that causes personal distress or impairment or causes potential or actual harm to another person. Examples are sexual sadism disorder, voyeuristic disorder and pedophilic disorder.
- Other mental disorders. This class includes mental disorders that are due to other medical conditions or that don’t meet the full criteria for one of the above disorders.
Treatment
Your treatment depends on the type of mental illness you have, its severity and what works best for you. In many cases, a combination of treatments works best.
If you have a mild mental illness with well-controlled symptoms, treatment from your primary care provider may be sufficient. However, often a team approach is appropriate to make sure all your psychiatric, medical and social needs are met. This is especially important for severe mental illnesses, such as schizophrenia.