Dec 28, 2012 12:23 PM by NBC News
Winter is in full swing, which for one in five Americans means their mood is about to take a dive.
Experts at the Mayo Clinic say seasonal affective disorder usually occurs during the cold, dark months of winter. Symptoms include sleepiness, social withdrawal and difficulty concentrating.
It affects women more than men, and is more common in northern climates.
Researchers say taking a walk outside, or using light therapy, can be enough to help people with the condition; however, professional help may be needed for those who feel hopeless or are suicidal.
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