Read more about symptoms and treatments for seasonal affective disorder (SAD). Reviewed 12/1/2023 Sources American Psychiatric Association. "Seasonal Affective Disorder (SAD)." https://www.psychiatry.org/Patients-Families/Seasonal-Affective-Disorder. American Psychological Association. "Seasonal Affective Disorder: More Than the Winter Blues." https://www.apa.org/topics/depression/seasonal-affective-disorder. Related stories