abnormal menstruation irregular menstruation http://purl.obolibrary.org/obo/NCIT_C35219 https://en.wikipedia.org/wiki/Irregular_menstruation https://www.wikidata.org/wiki/Q6073603 Deviations from the normal process of menstruation; e.g. delayed, difficult, profuse, scanty, unusual bleeding, etc. irregular menstruation, unspecified menstrual irregularity menstruation irregular