Oligomenorrhea

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What Wikipedia says

Oligomenorrhea is an abnormal bleeding pattern where menstrual bleeding occurs at intervals of greater than 35 days, with fewer than 9 periods in a year. The period may be light in flow, short in duration or occur at irregular intervals.

Excerpt from the Wikipedia article “Oligomenorrhea”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Teixeira, J., Rueda, B.R., and Pru, J.K., Uterine Stem cells (September 30, 2008), StemBook, ed. The Stem Cell Research Community, StemBook, doi/10.3824/stembook.1.16.1, http://www.stembook.org., CC BY 3.0, via Wikimedia Commons.