Menstruation »
What is menstruation?
Menstruation is a woman's monthly bleeding, also called a period. When you
menstruate, your body is shedding the lining of the
uterus (womb). Menstrual
blood flows from the uterus through the small opening in the
cervix, and passes
out of the body through the vagina. Most menstrual periods last from three to
five days.
What is the menstrual cycle?
Menstruation is part of the menstrual cycle, which prepares your body for
pregnancy each month. A cycle is counted from the first day of one period to the
first day of the next period. The average menstrual cycle is 28 days long.
Cycles can range anywhere from 21 to 35 days in adults and from 21 to 45 days in
young teens.
Body chemicals called hormones rise and fall during the month to make the
menstrual cycle happen.
What happens during the menstrual cycle?
In the first half of the cycle, levels of estrogen (the &q...
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