When it's more than 'winter blues'

Story highlights

  • About 5% of the population meets the criteria for seasonal affective disorder
  • Symptoms usually begin in the fall as the days shorten
  • Light boxes, antidepressants and psychotherapy can all help
  • Sufferers can also travel or, in extreme cases, move to sunnier climes

Dr. Charles Raison, CNNhealth's mental health expert, is an associate professor of psychiatry at the University of Arizona in Tucson.

(CNN)I grew up in a place where the sun shone every day from May through October. These sun-drenched days were the happiest times of my life.

But in winter a dense fog would often blanket my hometown for weeks at a time, leaving the world gray and featureless and leaving me down and dreary. These seasons were so definite, so unchanging, that I just cam