Light therapy is a way to treat seasonal affective disorder (SAD) and certain other conditions by exposure to artificial light. SAD is a type of depression that occurs at a certain time each year, usually in the fall or winter.
During light therapy, you sit or work near a device called a light therapy box. The box gives off bright light that mimics natural outdoor light.
Light therapy is thought to affect brain chemicals linked to mood and sleep, easing SAD symptoms. Using a light therapy box may also help with other types of depression, sleep disorders and other conditions. Light therapy is also known as bright light therapy or phototherapy.
Feb. 08, 2017
- AskMayoExpert. Seasonal affective disorder (SAD). Rochester, Minn.: Mayo Foundation for Medical Education and Research; 2015.
- Martensson B, et al. Bright white light therapy in depression: A critical review of the evidence. Journal of Affective Disorders. 2015;182:1.
- Lam RW, et al. Efficacy of bright light treatment, fluoxetine, and the combination in patients with nonseasonal major depressive disorder: A randomized clinical trial. JAMA Psychiatry. 2016;73:56.
- Racz E, et al. Phototherapy and photochemotherapy for psoriasis. Dermatologic Clinics. 2015;33:79.
- Van Maanen A, et al. The effects of light therapy on sleep problems: A systematic review and meta-analysis. Sleep Medicine Reviews. 2016;29:52.
- Avery D. Seasonal affective disorder: Treatment. http://www.uptodate.com/home. Accessed Feb. 8, 2016.
- Sanassi LA. Seasonal affective disorder: Is there light at the end of the tunnel? JAAPA. 2014;27:18.
- Melrose S. Seasonal affective disorder: An overview of assessment and treatment approaches. Depression Research and Treatment. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4673349/. Accessed Feb. 8, 2016.
- Kurlansik SL, et al. Seasonal affective disorder. American Family Physician. 2012;86:1037.
- O'Leary RE, et al. Update on tanning: More risks, fewer benefits. Journal of the American Academy of Dermatology. 2014;70:562.
- Seasonal affective disorders (SAD) — Treatment. NHS Choices. http://www.nhs.uk/Conditions/Seasonal-affective-disorder/Pages/Treatment.aspx. Accessed Feb. 15, 2016.
- Hall-Flavin DK (expert opinion). Mayo Clinic, Rochester, Minn. Feb. 15, 2016.