What is Seasonal Affective Disorder? Have you noticed changes in your mood and general well-being with the change of the seasons? For many people the changing of the seasons has a significant impact on their mental health. Seasonal Affective Disorder (SAD) is a type of depression that occurs at the same time annually. It is estimated that approximately 15% of Canadians will report a mild case of SAD each year, while 2-3% will report more serious symptoms. Symptoms include (b