Definition

Seasonal affective disorder (SAD) is a type of depression that corresponds to seasonal changes in light. It most commonly occurs in late fall and lasts through the winter and into spring. It's not uncommon to feel "down" during the winter months. But people with SAD are not able to function normally during these months. It often begins during adolescence or young adulthood.

Brain—Psychological Organ

SAD may be caused by fluctuations in hormones and brain chemicals.

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