Shortening of the menstrual cycle following light therapy in seasonal affective disorder

Psychiatry Res. 2007 Sep 30;153(1):93-5. doi: 10.1016/j.psychres.2006.12.016. Epub 2007 Jun 26.


A significantly earlier onset of menstruation by 1.2 days, on average, was found following light therapy in 38 winter depressives; in two of them it could be classified as a minor side effect. There was no association between this shortening and depression improvement. A direct action of light on the hypothalamic-pituitary-gonadal axis is suggested.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Adult
  • Female
  • Humans
  • Menstrual Cycle / psychology
  • Menstrual Cycle / radiation effects*
  • Middle Aged
  • Phototherapy*
  • Reference Values
  • Seasonal Affective Disorder / therapy*