Seasonal affective disorder

Seasonal Affective Disorder (SAD) is a type of depression that occurs at specific times of the year, often during the fall and winter months when there is less natural sunlight. It is considered a subtype of major depressive disorder (MDD) or bipolar disorder, with a clear seasonal pattern. The primary characteristic of SAD is that the symptoms of depression, such as low mood, fatigue, irritability, and lack of interest in activities, tend to appear during the same seasons each year, most commonly in late autumn or early winter, and resolve during the spring or summer months.

The exact cause of SAD is not fully understood, but there are several theories that may explain its occurrence. One prominent theory suggests that the reduced exposure to sunlight during ______ ________ _______ _____ __________ ______ _______ ________.
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