Seasonal affective disorder (SAD) is a type of depression with a recurring seasonal pattern, with symptoms most often starting in the late fall and early winter and going away in the spring and summer. The risk of SAD is higher in people who live far from the equator and those with a personal or family history of depression. Women are more likely than men to develop SAD, and younger people have a higher risk than older ones.
Types of treatment that have been studied for SAD include medication (antidepressants), psychotherapy (such as cognitive behavioral therapy, CBT), light therapy, and dietary supplements (such as vitamin D).
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Last Updated: June 2019
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