Seasonal affective disorder (SAD), often known as seasonal depression, is a mood disorder that has a seasonal pattern. It usually occurs each year at the same time, usually starting in autumn/winter and ending in spring, or early summer.
People with seasonal affective disorder may experience:
- feeling tired, or lacking energy
- sleeping too much
- increase in appetite and cravings for carbohydrates
- weight gain
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Last reviewed: October 2016