Some people suffer from symptoms of depression during the winter months, with symptoms subsiding during the spring and summer months. These symptoms may be a sign of seasonal affective disorder.
The mood disorder is associated with depression and related to seasonal variations of light. It affects half a million people every winter between September and April, peaking in December, January and February.
Three out of four sufferers are women. The main age of onset of the disorder is between 18 and 30 years of age. It occurs in both northern and southern hemispheres but is extremely rare in those living within 30 degrees latitude of the equator.
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