menstrual cycle diagram

August 03, 2026

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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. As you age, your menstrual cycles typically become shorter and more regular. Your menstrual cycle might be regular -- about the same length every month -- or somewhat irregular. Your period might be light or heavy, painful or pain-free, long or short and still be considered typical. Within a broad range, "typical" is what's typical for you. Menstrual cycle The menstrual cycle is a series of natural changes in hormone production and the structures of the uterus and ovaries of the female reproductive system that makes pregnancy possible. The ovarian cycle controls the production and release of eggs and the cyclic release of estrogen and progesterone. The uterine cycle governs the preparation and maintenance of the lining of the ... The menstrual cycle is the monthly series of changes your body undergoes to prepare for a potential pregnancy. This cycle is controlled by a complex system of hormones that cause physical changes in your reproductive system. Menstrual cycle, recurring fluctuations in hormone levels that produce physical changes in the uterus and ovaries to prepare the female body for pregnancy. In adult women, the menstrual cycle lasts anywhere from 21 to 40 days. Learn about the phases and hormonal control of the menstrual cycle. For related background details, please refer to our report on trailer wiring for lights. Knowing the stages of the menstrual cycle can help put you in control of your body and empower you to know when to speak with a doctor. We’ll tell you all about the menstrual, follicular ...