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Menstrual irregularities can have a variety of causes, including pregnancy, hormonal imbalances, infections, diseases, trauma, and certain medications.1,2,3,4,5,6
Causes of irregular periods (generally light) include:2
Perimenopause (generally in the late 40s and early 50s)
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.
Master-Hunter, T., & Heiman, D. L. (2006). Amenorrhea: Evaluation and treatment. American Family Physician, 73, 1374–1382.
Apgar, B. S., Kaufman, A. H., George-Nwogu, U., & Kittendorf, A. (2007). Treatment of menorrhagia. American Family Physician, 75, 1813–1819.
Practice Committee of the American Society for Reproductive Medicine. (2008). Current evaluation of amenorrhea [Review]. Fertility and Sterility, 90, S219–S225.
French, L. (2005). Dysmenorrhea. American Family Physician, 71, 285–291.
Godfrey, E. M., Folger, S. G., Jeng, G., Jamieson, D. J., & Curtis, K. M. (2013). Treatment of bleeding irregularities in women with copper-containing IUDs: A systematic review. Contraception, 87(5), 549–566. Retrieved August 2, 2016, from http://www.contraceptionjournal.org/article/S0010-7824(12)00816-5/abstract