How many women are affected by menstrual irregularities?

Menstrual irregularities occur in an estimated 14% to 25% of women of childbearing age.1

Estimates of the number of women with menstrual irregularities may differ by the cause or nature of the irregularity. For example, if a woman experiences severe cramps, she might be included in the tally of women with endometriosis rather than in the tally of women with menstrual irregularities.


  1. Whitaker, L., & Critchley, H. O. D. (2016). Abnormal uterine bleeding. Best Practice & Research Clinical Obstetrics & Gynaecology, 34, 54–65. Retrieved December 2, 2016, from external link.
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