"Depression may be described as feeling sad, blue, unhappy, miserable, or down in the dumps. Most of us feel this way at one time or another for short periods.
True clinical depression is a mood disorder in which feelings of sadness, loss, anger, or frustration interfere with everyday life for weeks or longer.
Causes, incidence, and risk factors
The exact cause of depression is not known. Many researchers believe it is caused by chemical changes in the brain. This may be due to a problem with your genes, or triggered by certain stressful events. More likely, it"s a combination of both.
Some types of depression run in families. But depression can also occur if you have no family history of the illness. Anyone can develop depression, even kids.
The following may play a role in depression:
Alcohol or drug abuse
Certain medical conditions, including underactive thyroid, cancer, or long-term pain
Certain medications such as steroids
Sleeping problems
Stressful life events, such as:
Breaking up with a boyfriend or girlfriend
Failing a class
Death or illness of someone close to you
Divorce
Childhood abuse or neglect
Job loss
Social isolation (common in the elderly)"
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