Are You Depressed? Take the Quiz

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Studies show that about 20 million Americans suffer from recurrent bouts with major depression. It's estimated that the economic costs in the U.S. alone are more than $53 billion a year.

The news gets worse: Depression is now considered the leading cause of absenteeism at work. According to Mental Health: A Report of the Surgeon General, major depression disorders account for as many as one in three suicides.

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From genetic influence to personality and environmental factors, the causes of depression are varied. Experts say the most effective treatment appears to be a combination of medication and psychotherapy.

It's a sad fact that, without treatment, up to 90 percent of those who suffer a single episode of serious depression will have a second attack within two years. The bottom line: This is a serious and relatively common problem that needs attention.

What follows is a short checklist of typical symptoms of depression. Anyone who believes five or more of these items are true should consult a professional for assistance.

1. I have deep feelings of sadness.

2. I have lost interest and pleasure in things I used to enjoy.

3. I have had changes in my weight and appetite.

View more: Mind & Body