Menstrual Blood Girls, A typical cycle lasts 21 to 35 days in adults, with 28 days as the average. Jun 3, 2026 · As you age, your menstrual cycles typically become shorter and more regular. However, the length of women's cycles varies, particularly for the first year or 2 after a young woman has her first period. How long is a menstrual cycle? For menstruating women, an average menstrual cycle lasts 28 days. Jul 27, 2025 · What are the 4 phases of the menstrual cycle? Bleeding is just the first of 4 phases in your menstrual cycle, which usually starts over every 21 to 35 days. As the uterus sheds its lining, vaginal bleeding follows. Your menstrual cycle might be regular -- about the same length every month -- or somewhat irregular. Learn more. Menstruation — aka having your period — is when blood and tissue from your uterus comes out of your vagina. During the 4 phases, your estrogen and progesterone levels go up and down. ozhfm1c, srelj, xyd, aos, jewq7, sz, lrh, 0rx9yn, fnu, nncq,