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Definition

By Mayo Clinic staff

Depression is a medical illness that causes a persistent feeling of sadness and loss of interest. Depression can cause physical symptoms, too.

Also called major depression, major depressive disorder and clinical depression, it affects how you feel, think and behave. Depression can lead to a variety of emotional and physical problems. You may have trouble doing normal day-to-day activities, and depression may make you feel as if life isn't worth living.

More than just a bout of the blues, depression isn't a weakness, nor is it something that you can simply "snap out" of. Depression is a chronic illness that usually requires long-term treatment, like diabetes or high blood pressure. But don't get discouraged. Most people with depression feel better with medication, psychological counseling or other treatment.

References
  1. Depressive disorders. In: Diagnostic and Statistical Manual of Mental Disorders DSM-IV-TR. 4th ed. Arlington, Va.: American Psychiatric Association; 2000. http://www.psychiatryonline.com. Accessed Jan. 12, 2009.
  2. Depression. National Institute of Mental Health. http://www.nimh.nih.gov/health/publications/depression/index.shtml. Accessed Jan. 12, 2010.
  3. Loosen PT, et al. Mood disorders. In: Ebert MH, et al. Current Diagnosis and Treatment: Psychiatry. 2nd ed. New York, N.Y.: McGraw Hill; 2008. http://www.accessmedicine.com/content.aspx?aid=3285019. Accessed Jan. 12, 2010.
  4. Espinoza RT, et al. Diagnosis and management of late-life depression. http://www.uptodate.com/home/index.html. Accessed Jan. 12, 2010.
  5. Lyness JM. Depression: Epidemiology and pathogenesis. http://www.uptodate.com/home/index.html. Accessed Jan. 12, 2010.
  6. Hall-Flavin, DK (expert opinion). Mayo Clinic, Rochester, Minn. January 19, 2009.
  7. Katon W, et al. Initial treatment of depression in adults. http://www.uptodate.com/home/index.html. Accessed Jan. 12, 2010.
  8. Martinez M, et al. Psychopharmacology. In: Hales RE. Textbook of Psychiatry. Arlington, Va.: American Psychiatric Publishing; 2008. http://www.psychiatryonline.com/content.aspx?aID=320111. Accessed Jan. 12, 2009.
  9. van der Watt G, et al. Complementary and alternative medicine in the treatment of anxiety and depression. Current Opinion in Psychiatry. 2008;2:37.
  10. Mischoulon D. Update and critique of natural remedies as antidepressant treatments. Obstetrics & Gynecology Clinics of North America. 2009;36:789.
  11. Wahner-Roedler D. Treating 20 common conditions. In: Bauer B. Mayo Clinic Book of Alternative Medicine. New York, N.Y.: Time Inc.; 2007:174.
DS00175 Feb. 11, 2010

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