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What causes depression in the winter?

I'm 24 and female. I get really sad in the winter. Why is this? Just a lack of sunshin?
What you are experiencing may be something called seasonal affective disorder. Seasonal affective disorder is a form of depressive disorder that cycles with the seasons. People with this disorder tend to have episodes of depression in the darkest winter months, and their moods tend to improve in summer months. The exact cause of seasonal affective disorder is not entirely known. It is thought that in part it does have something to do with lack of sufficient sunshine, because sunshine is linked both subjectively to better mood and also objectively to changes in some of the brain's chemicals. Other factors may include changes in the body's natural internal clock, or day-night rhythm, associated with imbalance in the body's melatonin levels. If you feel you have seasonal affective disorder, you should talk to your primary care doctor or your psychiatrist. Seasonal affective disorder can be effectively treated. Sometimes, light therapy is a sufficient form of treatment. Other times anti depression medications can be taken, either year round or just for the months surrounding the time in the winter when the symptoms are at their worst. Your doctor can help you decide what the best form of treatment for your case will be.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under Zocdoc’s Terms of Service.

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