About 20% of Americans are depressed; however, one-third receives medical or psychiatric help for their depression. Depression is characterized by mood changes and loss of interest in normal activities. Patients who are depressed might have insomnia, fatigue, a feeling of despair, and an inability to concentrate. Some may have suicidal thoughts. Depression is associated with two-third of all suicides.
Depression is caused by a number of factors including genetic predisposition, social and environmental factors, and biologic conditions such as insufficient monoamine neurotransmitter (norepinephrine and serotonin).
There are three types of depression:
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