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Mental illness is any disease or condition that influences the way a person thinks, feels, behaves, and/or relates to others and to his or her surroundings. Although the symptoms of mental illness can range from mild to severe and are different depending on the type of mental illness, a person with an untreated mental illness often is unable to cope with life's daily routines and demands.
What Causes Mental Illness?
Although the exact cause of most mental illnesses is not known, it is becoming clear through research that many of these conditions are caused by a combination of genetic, biological, psychological, and environmental factors -- not personal weakness or a character defect -- and recovery from a mental illness is not simply a matter of will and self-discipline.
- Heredity (genetics): Many mental illnesses run in families, suggesting they may be passed on from parents to children through genes. Genes contain instructions for the function of each cell in the body and are responsible for how we look, act, think, etc. However, just because your mother or father may have or had a mental illness doesn't mean you will have one. Hereditary just means that you are more likely to get the condition than if you didn't have an affected family member. Experts believe that many mental conditions are linked to problems in multiple genes -- not just one, as with many diseases -- which is why a person inherits a susceptibility to a mental disorder but doesn't always develop the condition. The disorder itself occurs from the interaction of these genes and other factors -- such as psychological trauma and environmental stressors -- which can influence, or trigger, the illness in a person who has inherited a susceptibility to it.
- Biology: Some mental illnesses have been linked to an abnormal balance of brain chemicals called neurotransmitters. Neurotransmitters help nerve cells in the brain communicate with each other. If these chemicals are out of balance or are not working properly, messages may not make it through the brain correctly, leading to symptoms of mental illness. In addition, defects in or injury to certain areas of the brain also have been linked to some mental conditions.
- Psychological trauma: Some mental illnesses may be triggered by psychological trauma suffered as a child, such as severe emotional, physical, or sexual abuse; a significant early loss, such as the loss of a parent; and neglect.
- Environmental stressors: Certain stressors -- such as a death or divorce, a dysfunctional family life, changing jobs or schools, and substance abuse -- can trigger a disorder in a person who may be at risk for developing a mental illness.
Quick GuideWhat's Your Biggest Fear? Phobias
Can Mental Illness Be Prevented?
Unfortunately, most mental illnesses are caused by a combination of factors and cannot be prevented.
How Common Is Mental Illness?
Mental illnesses are very common. In fact, they are more common than cancer, diabetes, or heart disease. According to the National Institute of Mental Health, about 25% of American adults (those ages 18 and older) and about 13% of American children (those ages 8 to 15) are diagnosed with a mental disorder during a given year.
Mental illness does not discriminate. It can affect people of any age, income or educational level, and cultural background. Although mental illness affects both males and females, certain conditions -- such as eating disorders -- tend to occur more often in females, and other disorders -- such as attention deficit hyperactivity disorder (ADHD) -- more commonly occur in children.
How Is Mental Illness Treated?
A mental illness, like many chronic illnesses, requires ongoing treatment. Fortunately, much progress has been made in the last two decades in treating mental illnesses. As a result, many mental conditions can be effectively treated with one or a combination of the following therapies:
- Group therapy.
- Day treatment or partial hospital treatment.
- Specific therapies, such as cognitive-behavior therapy and behavior modification.
Other treatments available include:
What Is the Outlook for People with Mental Illness?
When diagnosed early and treated properly, many people fully recover from their mental illness or are able to successfully control their symptoms. Although some people become disabled because of a chronic or severe mental illness, many others are able to live full and productive lives. In fact, as many as 8 in 10 people suffering from a mental illness can effectively return to their normal activities if they receive appropriate treatment.
WebMD Medical Reference
Mental Health Resources
Reviewed by Joseph Goldberg, MD on February 14, 2012
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DepressionDepression is an illness that involves the body, mood, and thoughts and affects the way a person eats and sleeps, the way one feels about oneself, and the way one thinks about things. The principal types of depression are major depression, dysthymia, and bipolar disease (also called manic-depressive disease).
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Dissociative Identity DisorderDissociative identity disorder (formerly known as multiple personality disorder or split personality disorder) is a mental illness in which a person has at least two distinct personalities. Symptoms and signs include lapses in memory, feeling unreal, blackouts in time, hearing voices in their head that are not their own, not recognizing themselves in the mirror, and finding items in one's possession but not recalling how they were acquired. Treatment usually involves psychotherapy, medications, and sometimes hypnosis.
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The definition of a genetic disease is a disorder or condition caused by abnormalities in a person's genome. Some types of genetic inheritance include single inheritance, including cystic fibrosis, sickle cell anemia, Marfan syndrome, and hemochromatosis. Other types of genetic diseases include multifactorial inheritance. Still other types of genetic diseases include chromosome abnormalities (for example, Turner syndrome, and Klinefelter syndrome), and mitochondrial inheritance (for example, epilepsy and dementia).
ParaphiliaParaphilias are characterized by sexual fantasies, urges, and behaviors involving unusual objects or activities. Exhibitionism, fetishism, frotteurism, pedophilia, sadism, transvestitism, voyeurism, and sexual masochism are examples of paraphilias. Counseling, therapy, and medications are used in the treatment of paraphilias.
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SchizophreniaSchizophrenia is a disabling brain disorder that may cause hallucinations and delusions and affect a person's ability to communicate and pay attention. Symptoms of psychosis appear in men in their late teens and early 20s and in women in their mid-20s to early 30s. With treatment involving the use of antipsychotic medications and psychosocial treatment, schizophrenia patients can lead rewarding and meaningful lives.
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Symptoms of Serious Diseases and Health ProblemsLearn how to recognize early warning signs and symptoms of serious diseases and health problems, for example, chronic cough, headache, chest pain, nausea, stool color or consistency changes, heartburn, skin moles, anxiety, nightmares, suicidal thoughts, hallucinations, delusions, lightheadedness, night sweats, eye problems, confusion, depression, severe pelvic or abdominal pain, unusual vaginal discharge, and nipple changes.
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