Menstruation: MedlinePlus
A service of the U.S. National Library of Medicine
National Institutes of Health New on the MedlinePlus Menstruation page:
07/15/2012 08:00 PM EDT
Source: Dept. of Health and Human Services, Office on Women's Health
07/15/2012 08:00 PM EDT
Source: Dept. of Health and Human Services, Office on Women's Health
A service of the U.S. National Library of Medicine
National Institutes of Health
National Institutes of Health Menstruation
Also called: Menses, Menstrual period, Period
Menstruation, or period, is a woman's monthly bleeding. Every month, your body prepares for pregnancy. If no pregnancy occurs, the uterus sheds its lining. The menstrual blood is partly blood and partly tissue from inside the uterus, or womb. It passes out of the body through the vagina. Periods usually start around age 12 and continue until menopause, at about age 51. Most periods last from three to five days.
You should consult your health care provider if
You should consult your health care provider if
- You haven't started menstruating by age 16
- Your period suddenly stops
- You bleed excessively, or for more days than usual
- You suddenly feel sick after using tampons
- You bleed between periods
- You have severe pain during your period
Dept. of Health and Human Services Office on Women's Health
MEDICAL ENCYCLOPEDIA
National Institutes of Health
- The primary NIH organization for research on Menstruation is the National Institute of Child Health and Human Development
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