What is Seasonal Affective Disorder
What exactly is Seasonal Affective Disorder? Our medical encyclopedia can get you started in your journey to learn more about this condition. Continue your research by clicking a new category in the left navigation.

SAD may be caused by fluctuations in hormones and brain chemicals.
© 2009 Nucleus Medical Media, Inc.
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Seasonal Affective Disorder 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.

SAD may be caused by fluctuations in hormones and brain chemicals.
© 2009 Nucleus Medical Media, Inc.
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