A period, often referred to as a menstrual cycle, is a natural process that occurs in the bodies of people with uteruses. It typically happens once a month and involves the shedding of the uterine lining when pregnancy does not occur. This process usually lasts between three to seven days and can come with various symptoms, such as cramps and mood changes. During a period, the body goes through hormonal changes that prepare it for potential pregnancy. If no fertilization occurs, the lining is expelled, resulting in menstrual blood. Understanding periods is important for health and can help individuals track their cycles and manage any discomfort associated with them.