What is menstruation cycle?

The menstrual cycle is the monthly series of changes a woman's body goes through in preparation for a possible pregnancy. It involves the shedding of the uterine lining, which results in bleeding known as menstruation. The cycle typically lasts about 28 days, although it can vary from woman to woman. The menstrual cycle is controlled by hormones produced by the ovaries and pituitary gland, and it involves the release of an egg from the ovaries (ovulation) and the thickening of the uterine lining in preparation for a fertilized egg to implant. If pregnancy does not occur, the uterine lining is shed during menstruation, and the cycle begins again.