Seasonal affective disorder, or SAD, is a type of depression that’s related to the changes in seasons. Symptoms typically appear in the fall, worsen through the winter months and eventually go away in the spring or summer. The answers to these questions should help you better understand SAD and determine if you should seek care.

What are the possible causes of SAD?

While the exact cause is unknown, it may be linked to reduced sunlight, which reacts with the natural chemicals in your body, like serotonin and melatonin, that determine mood and energy levels and regulate sleep.

SAD isn’t just a case of the winter blues, a condition that is milder and more common. SAD symptoms can make it difficult to function at home, work and in social settings.

Who is most at risk for experiencing sympt

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