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Mental Illness: Learn the Definition, Tests and Statistics

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
  • 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.

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.

Major depression, bipolar disorder, and schizophrenia are among the U.S.’s
top 10 leading causes of disability.

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:

  • Medication.
  • Psychotherapy.
  • Group therapy.
  • Day treatment or partial hospital treatment.
  • Specific therapies, such as cognitive-behavior therapy and behavior

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


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