Why do women have periods?

The menstrual cycle occurs as the uterus prepares for pregnancy, and when fertilization doesn’t happen, the lining is shed through bleeding.

Women experience periods as a natural function of the reproductive system. Each month, the body prepares for a possible pregnancy. The ovaries release an egg, and the lining of the uterus (endometrium) thickens to host a fertilized egg. If fertilization does not occur, the body ends this preparation, and the thickened lining is shed through bleeding. This process is called menstruation, or a period. Menstruation begins during puberty and continues until menopause. The menstrual cycle is crucial for women’s health, as it maintains hormonal balance. The hormones estrogen and progesterone not only regulate reproductive health but also influence bone strength, skin health, and mood. Menstruation is also a natural sign of fertility. However, periods may cause discomfort such as cramps, fatigue, or mood swings for some women. Despite these challenges, menstruation represents the body’s natural rhythm and a vital part of the ability to reproduce. In short, women have periods because it is the body’s way of preparing for and regulating fertility. / 2025-10-16 00:00:36