What causes uterine laxity, and what are the common contributing factors?

Common factors contributing to uterine laxity include: 1. Childbirth and age: Childbirth, especially vaginal delivery, may lead to uterine laxity or even prolapse. Additionally, with increasing age, declining hormone levels and impaired ovarian function can also contribute to uterine laxity. 2. Surgery and trauma: Direct injury to the uterus during surgery, or damage to pelvic muscles and ligaments caused by trauma, may result in uterine laxity. 3. Hormonal changes: Imbalances in estrogen and progesterone levels or other hormonal fluctuations can affect the growth and contractile capacity of uterine smooth muscle cells, leading to uterine laxity. 4. Inflammation and infection: Chronic inflammation such as cervicitis or endometritis, which continuously irritates the uterus, may also cause uterine laxity. 5. Other factors: Conditions such as cervical insufficiency and uterine fibroids may also lead to uterine laxity. Among these factors, childbirth, advancing age, and hormonal changes are the most common causes of uterine laxity.