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Seasonal affective disorder (SAD) Mental Health Related Definition

Definition: Seasonal affective disorder (SAD) is a form of depression that appears related to fluctuations in the exposure to natural light. It usually strikes during autumn and often continues through the winter when natural light is reduced. Researchers have found that people who have SAD can be helped with the symptoms of their illness if they spend blocks of time bathed in light from a special full-spectrum light source, called a "light box."

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