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The syndrome of winter depression, is called seasonal affective disorder (SAD), is specifically related to the changes in the length of daylight from the seasons. It begins to lift as spring approaches with daylight hours becoming longer. SAD is rare in the tropics, but is measurably present at latitude of 30 degrees N (or S) and higher. People who live in the Arctic region are especially susceptible due to the effects of polar night. Prolonged periods of overcast weather can also intensify SAD. Although doctors don’t know the causes of seasonal affective disorder, but heredity, age and your body's chemical makeup all can play a role. Research has showed various possibilities for having SAD. The two possibilities is the lack of serotonin and the other theory is that melatonin produced in the pineal gland is the primary cause.

While its exact cause is unknown, the disorder has been linked to a malfunction in the body’s biological clock that controls temperature and......

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Approximate Pages: 4 (250 words per double-spaced page)

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