Menstruation is a natural process that occurs in the bodies of many women and people assigned female at birth. It involves the shedding of the uterine lining when pregnancy does not happen. This usually happens once a month and lasts for a few days. During this time, some may experience symptoms like cramps, mood swings, or fatigue. The menstrual cycle is typically around 28 days, but it can vary from person to person. It is an important part of reproductive health and signifies that the body is functioning normally. Understanding menstruation helps in managing health and well-being throughout life.