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Some people experience symptoms severe enough to affect quality of life, and 6 percent require hospitalization.Many people with SAD report at least one close relative with a psychiatric disorder, most frequently a severe depressive disorder (55 percent) or alcohol abuse (34 percent).Another theory is that people with SAD may have trouble regulating their levels of serotonin, which is a major neurotransmitter involved in mood.Finally, research has suggested that people with SAD also may produce less Vitamin D, which is believed to play a role in serotonin activity.
The age of onset is estimated to be between the age of 18 and 30.
The most common seasonal pattern is for depressive episodes to being in the fall or winter and diminish in the spring.
A less common type of SAD, known as summer depression, usually begins in the late spring or early summer.
Vitamin D insufficiency may be associated with clinically significant depression symptoms.
There are several known risk factors that increase an individuals chance of developing SAD.Seasonal Affective Disorder, or SAD, is a type of recurrent major depressive disorder in which episodes of depression occur during the same season each year.