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The first day of menstrual bleeding is the date used for the last menstrual period (LMP). The typical length of time between the first day of one period and the first day of the next is 21 to 45 days in young women, and 21 to 35 days in adults. [2] [3] The average length is 28 days; one study estimated it at 29.3 days. [10]
Menstruation (also called menstrual bleeding, menses or a period) is the first and most evident phase of the uterine cycle and first occurs at puberty. Called menarche, the first period occurs at the age of around twelve or thirteen years. [8] The average age is generally later in the developing world and earlier in the developed world. [42]
Menopause is the opposite of menarche, the time when a girl's periods start. [12] In the years before menopause, a woman's periods typically become irregular, [13] [14] which means that periods may be longer or shorter in duration or be lighter or heavier in the amount of flow. [13]
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 ...
Menopause is a nearly universal experience for women who live to middle age. In the United States, an estimated 1.3 million women enter menopause every year. Around 90% of women experience ...
In modern Western society, women typically have about 450 periods during their lives, as compared to about 160 formerly. [7] Although it was evident that the pill could be used to suppress menstruation for arbitrary lengths of time, the original regimen was designed to produce withdrawal bleeding every four weeks to mimic the menstrual cycle. [8]
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. "For example ...
Officially it's called the moment magnitude scale. It's a logarithmic scale , meaning each number is 10 times as strong as the one before it. So a 5.0 earthquake is ten times stronger than a 4.0.