How long does a period last

How long does a period last

How long does a period last

This might sound like an odd question for something called Grammar Girl to ask, but I think it deserves a post. It came up in a few places in the last few weeks and my answer remains the same: periods last a whole second, and words that end with a period are pronounced with a short "i," not an "e".This article is about biological aspects of the reproductive cycle in humans. For information specific to monthly periods, see menstruation and menstruation (mammal).


Each cycle occurs in phases based on events in the ovary (ovarian cycle) or the uterus (uterine cycle). The ovarian cycle consists of the follicular phase, ovulation, and the luteal phase; the uterine cycle consists of the menstrual, proliferative and secretory phases. Day one of the menstrual cycle is the first day of the period, which lasts for about five days. Around day fourteen, an egg is usually released from the ovary. Menarche (the onset of the first period) usually occurs around the age of twelve years.

At around 20 weeks into gestation some 7 million immature eggs have already formed in an ovary. This decreases to around 2 million by the time a girl is born, and 300,000 by the time she has her first period. On average, one egg matures and is released during ovulation each month after menarche. 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. (Source:en.wikipedia.org)


The menstrual cycle can cause some women to experience problems that disrupt daily lives. These can include cramps, tender breasts, tiredness, and premenstrual syndrome. More severe problems such as premenstrual dysphoric disorder are experienced by 3–8% of women. The menstrual cycle can be modified by hormonal birth control. whereas the uterine cycle describes changes in the endometrial lining of the uterus. Both cycles can be divided into phases. The ovarian cycle consists of alternating follicular and luteal phases, and the uterine cycle consists of menstruation, the proliferative phase, and the secretory phase.

Stimulated by gradually increasing amounts of estrogen in the follicular phase, discharges of blood flow stop and the uterine lining thickens. Follicles in the ovary begin developing under the influence of a complex interplay of hormones, and after several days one, or occasionally two, become dominant, while non-dominant follicles shrink and die. About mid-cycle, some 10–12 hours after the luteinizing hormone (LH) surges, (Source:en.wikipedia.org)



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