menstruation menstruation 612.662 618.172 http://purl.obolibrary.org/obo/GO_0042703 http://purl.obolibrary.org/obo/NCIT_C3232 https://en.wikipedia.org/wiki/Menstruation https://en.wikipedia.org/wiki/Menstruation_(mammal) https://www.wikidata.org/wiki/Q12171 E1.0.2.3.0.0.9 The normal physiologic discharge through the vagina of blood and mucosal tissues from the nonpregnant uterus. The periodic shedding of the endometrium and associated menstrual bleeding in the menstrual cycle of humans and primates. Menstruation is due to the decline in circulating progesterone, and occurs at the late luteal phase when luteolysis of the corpus luteum takes place. desquamation phase menstrual menstrual period menstrual period menstrual phase menstruate menstruated menstruates menstruating menstruations period shark-week menstrual cycle phase menstrual cycle From 'Shark-Week' to 'Mangina': An Analysis of Words Used by People of Marginalized Sexual Orientations and/or Gender Identities to Replace Common Sexual and Reproductive Health Terms Glossary of HIV/AIDS-Related Terms