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A woman counting days on a monthly calendar on a tablet computer.

About Menstruation

  • What is menstruation?

  • What is the menstrual cycle?

  • What happens if a pregnancy occurs?


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  1. Sweet, M. G., Schmidt-Dalton, T. A., Weiss, P. M., & Madsen, K. P. (2012). Evaluation and management of abnormal uterine bleeding in premenopausal women. American Family Physician, 85, 35–43. [top]
  2. Dasharathy, S. S., Mumford, S. L., Pollack, A. Z., Perkins, N. J., Mattison, D. R., Wactawski-Wende, J., & Schisterman, E. F. (2012). Menstrual bleeding patterns among regularly menstruating women. American Journal of Epidemiology, 175, 536–545. [top]
  3. McDowell, M. A., Brody, D. J., & Hughes, J.P. (2007). Has age at menarche changed? Results from the National Health and Nutrition Examination Survey (NHANES) 1999-2004. Journal of Adolescent Health, 40, 227–231. [top]
  4. Krohn, P. L. (1949). Intermenstrual pain (the “Mittelschmerz”) and the time of ovulation. British Medical Journal, 1(4609), 803–805. Retrieved September 27, 2016, from [top]

What are the symptoms of menstruation?

What are menstrual problems or irregularities?

How many women are affected by menstrual irregularities?

What causes menstrual irregularities?

How do health care providers diagnose menstrual irregularities?

What are the common treatments for menstrual irregularities?