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  2. Menstruation - Wikipedia

    en.wikipedia.org/wiki/Menstruation

    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 ...

  3. Menstrual cycle - Wikipedia

    en.wikipedia.org/wiki/Menstrual_cycle

    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 ...

  4. Menstrual synchrony - Wikipedia

    en.wikipedia.org/wiki/Menstrual_synchrony

    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.

  5. Why do doctors always ask about your last menstrual period ...

    www.aol.com/lifestyle/why-doctors-always-ask...

    She advises anyone who menstruates to tell their doctor if their cycles are longer than 35 days or shorter than 21 days, they bleed for more than seven days, they soak through one or more tampons ...

  6. Irregular menstruation - Wikipedia

    en.wikipedia.org/wiki/Irregular_menstruation

    Oligomenorrhea generally refers to infrequent menstruation, More strictly, it is menstrual periods occurring at intervals of greater than 35 days, with only four to nine periods in a year. [8] Menstrual periods should have been regularly established before the development of infrequent flow and often (but not always) involves irregular intervals.

  7. Two Periods in One Month? Here’s All the Possible Reasons Why

    www.aol.com/lifestyle/two-periods-one-month...

    Having two periods in one month can happen for a number of reasons. Experts explain what it means and when to see a doctor.

  8. Why do we have a leap year? What would happen if we didn’t ...

    www.aol.com/news/why-leap-happen-didn-t...

    “If you do the math, that five hours, 48 minutes and 56 seconds isn’t exactly six hours, so we’re actually overcompensating,” Craddock said. “We have to make up for that difference too.”

  9. Menstruation (mammal) - Wikipedia

    en.wikipedia.org/wiki/Menstruation_(mammal)

    A few mammals do not experience obvious, visible signs of fertility (concealed ovulation).In humans, while women can learn to recognize their own level of fertility (fertility awareness), whether men can detect fertility in women is debated; recent studies have given conflicting results.