What is seasonal affective disorder?
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Seasonal affective disorder (SAD) is a condition where you develop symptoms of depression at the same time each year.
- Winter depression is the most common type. In the UK and other countries north of the equator the symptoms usually develop sometime between September and November and continue until March or April. Symptoms tend to be worse in December, January and February.
- Summer depression is much less common. It develops in the late spring and symptoms persist through the summer. It tends to have different features and may have a different cause to the common 'winter' type of SAD.
The rest of this leaflet deals only with the winter depression type of SAD.
- Next: Who gets Seasonal Affective Disorder?
More on SAD
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- How sun can help SAD
- Read in-depth information on depression
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- Have you suffered from SAD? Share your experiences
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