Seasonal Affective Disorder (SAD) Seasonal affective disorder
(SAD) is a condition in which a person feels depressed at a
certain time each year. Most people experience SAD during the
fall and winter months when days are shorter and there is less
light. The cause of SAD is not clearly known. It may be related
to changes in the amount and intensity of sunlight in the
different seasons. Seasonal affective disorder is sometimes
called "the winter blues." Treatment of SAD includes light
therapy and, if necessary, medicines. eMedicineHealth Medical
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