The menstrual cycle is not the same for every woman. Normal menstrual flow occurs about every 28 days, lasts about 4 days, and produces a total blood loss of 30 to 80 milliliters (2 tablespoons to about 1 cup). Periods may be regular, irregular, light, heavy, painful, pain-free, long, or short, and still be normal. Variation in the menstrual cycle is medically less significant than bleeding, pain, or discharge between periods. Bleeding may be something to worry about for women over age 50 (postmenopausal). The risk of malignancy increases with age. Make sure that bleeding is coming from the vagina and not from the rectum or in the urine. This can be accomplished by inserting a tampon into the vagina to confirm that the vagina is the source of the bleeding. A serious problem can best be detected by a health care provider.
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