For some people,their depression lasts only from December to February but returns at the same time each year.This is what psychologists call

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Seasonal affective disorder (SAD) is a type of depression that typically occurs during the winter months when there is less sunlight. Symptoms usually start in the fall and continue through the winter, but improve in the spring and summer. It is considered a subtype of major depressive disorder. Bipolar disorder and cyclothymia are not specific to a seasonal pattern of depressive symptoms.

For Some People,their Depression Lasts Only from December to February