What Is Seasonal Affective Disorder (SAD)?

It could be more than just the “winter blues” — be aware of winter-onset SAD. SAD is a type of depression tied to the seasons, with the most common form (winter-onset SAD) occurring during the fall and winter months and thought to be a result of shorter days with reduced natural light. Common symptoms, alongside typical symptoms of depression, include oversleeping, overeating and social withdrawal. Learn more about SAD symptoms and treatment options.