Mental Illness Basics
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.
Reviewed on 2/14/2012
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