The uterus is protected by four pairs of ligaments in the pelvic cavity, including the round ligament, broad ligament, main ligament and sacral ligament. The combined action of the four pairs of ligaments keeps the uterus in the center of the pelvis and prevents the uterus from sagging. The main ligament and the sacral ligament work together to pull the cervix backward and upward to maintain the uterus in an anteriorly inclined position, and the round ligament can keep the uterine fundus in an anteriorly inclined position, which helps to keep the whole uterus in an anteriorly inclined and forward-flexed position. The ligaments of the uterus are mainly formed by the thickening of connective tissues. When the ligaments that pull the uterus are relaxed, women will experience uterine prolapse, anterior tilt, and posterior tilt, and may experience lower abdominal pain and lumbar discomfort. When a woman needs to undergo hysterectomy, the ligaments need to be cut together in order to cut down the uterus completely.