Menstruation, also known illness, haemorrhage, rules, menstruation or menses, is simply a cyclical bleeding from the vagina, which prevents any mature woman.
The first menstruation is called menarche, menopause last. Menstruation is based on the death of the endometrium, with blood vessels that result in mucous membrane, open. The divested endometrium is often identified as a flaky mass. Menstruation usually lasts three to five days, the menstrual cycle twenty-six to thirty days. During the fertile period, a menstruating woman about 450 times. With an average of four days at a time, so it comes down to about five years of a lifetime.