A member asked:

What causes seasonal depression?

9 doctors weighed in across 2 answers

Changes in light: Most researchers believe that exposure to sunlight can impact mood. People with this disorder tend to find that the problem is worse during winter months when sunlight is less. There has been success with particular kinds of artificial lights that mimic sunlight. Medications are also effective for this kind of depression.

Answered 9/13/2015

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Seasonal Depression: Seasonal affective disorder is hypothesized as lower levels of serotonin in certain parts of the brain secondary to decreased exposure to sunlight. This is the basis for phototherapy.

Answered 3/13/2014

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