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What causes irregular menstrual cycles? First, age is a factor. After menarche (a person’s first period) ...
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 ...
Diagram illustrating how the uterus lining builds up and breaks down during the menstrual cycle 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. The menstrual cycle is characterized by the rise and fall of hormones. Menstruation is triggered by falling progesterone ...
Menstrual synchrony, also called the McClintock effect, [1] or the Wellesley effect, [2] is a contested process whereby women who begin living together in close proximity would experience their menstrual cycle onsets (the onset of menstruation or menses) becoming more synchronized together in time than when previously living apart.
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The term metrorrhagia is often used for irregular menstruation that occurs between the expected menstrual periods. [9] [10] Oligomenorrhea is the medical term for infrequent, often light menstrual periods (intervals exceeding 35 days). [11] Polymenorrhea is the medical term for cycles with intervals of 21 days or fewer.
Mammals that have menstrual cycles shed the endometrium through menstruation instead. Humans, elephant shrews , and a few other species have menstrual cycles rather than estrous cycles. Humans, unlike most other species, have concealed ovulation , a lack of obvious external signs to signal estral receptivity at ovulation (i.e., the ability to ...
Luu explains that “knowing the first day of your last menstrual period is generally about tracking your menstrual cycles and understanding what is normal for you.