Menstruation (also known as a period, among other colloquial terms) is the regular discharge of blood and mucosal tissue from the inner lining of the uterus through the vagina. [1]

Menstruation — aka having your period — is when blood and tissue from your uterus comes out of your vagina. It usually happens once every month.

Dec 9, 2022 · Your menstrual cycle begins on the first day of your period. Your cycle prepares your body for a possible pregnancy. The average cycle lasts between 24 and 38 days.

Jul 27, 2025 · The menstrual phase is your actual period, or when you’re shedding your uterine lining and bleeding. It usually lasts 3 to 5 days, and often overlaps with the follicular phase.

Jan 11, 2026 · Menstruation (or period) happens monthly. As the uterus sheds its lining, vaginal bleeding follows. Menstrual blood is made of blood and tissue.

Apr 22, 2023 · What's typical? The menstrual cycle is counted from the first day of one period to the first day of the next. The cycle isn't the same for everyone. Menstrual bleeding might happen every 21 to …

Sep 4, 2025 · Menstruation is period bleeding, which is casually referred to as “having your period.” This happens monthly (for most females) during your fertile years, except during pregnancy.

Jan 13, 2025 · A menstrual cycle begins with the first day of your period, or menstruation [MEN-stroo-AY-shuhn] and starts over again when the next period begins. Throughout a monthly menstrual …

Learn everything about the menstrual cycle with Flo: luteal and follicular phases, ovulation, periods, fertility, symptoms, cramps, and much more!

Apr 21, 2023 · Menstruation occurs when the lining of the uterus sheds, turning into blood. This blood then flows out of the body through the vagina. It is also known as a period. Periods happen due to the...