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Seasonal affective disorder (SAD)

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Introduction
Seasonal affective disorder (SAD) is a type of depression that has a seasonal pattern.
Symptoms of seasonal affective disorder
The symptoms of seasonal affective disorder (SAD) are similar to those of normal depression. However, unlike non-seasonal depression, they occur on a seasonal basis.
Causes of seasonal affective disorder
The symptoms of seasonal affective disorder (SAD) are thought to be linked to the shorter, winter days when the body has less exposure to sunlight.
Diagnosing seasonal affective disorder
You should visit your GP if you have the symptoms of seasonal affective disorder (SAD). Effective treatments are available if you're diagnosed with the condition.
Treating seasonal affective disorder
Seasonal affective disorder (SAD) can usually be treated using a number of treatments, including cognitive behavioural therapy, light therapy and antidepressants.