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Results 1 - 1 of 1 for Abnormal sadness
  1. Seasonal affective disorder 
    ... disorder. Major depressive disorder is characterized by prolonged sadness and a general lack of interest, while bipolar ... the brain that it is time to sleep.Abnormal regulation of circadian rhythms likely contribute to an ...
    https://medlineplus.gov/.../condition/seasonal-affective-disorder - Genetics