How common is seasonal affective disorder?

Pretty Common: Depends on where you live & the amount of sunlight there. One recent survey in toronto showed a 3 percent rate in the general population.

Not too: Classic sad isnt that common in my experience but many clinically depressed pts feel worse on overcast days & better when it's sunny--many feel that light therapy helps them.

SAD: SAD is now referred to as Depressive Disorder with Seasonal Pattern in DSM 5. It is a subtype of major depression. In the US – 1 to 10% of adults experience SAD but prevalence depends on which geographic area you live in.