What causes vaginal wall prolapse in the late stages of pregnancy?

Vaginal wall prolapse in pregnant women during the late stages of pregnancy is generally caused by factors such as fetal engagement, vulvar varicose veins, and excessive pressure on the lower body. A detailed analysis is as follows:

1. Fetal Engagement

During the late stages of pregnancy, the fetus typically assumes a "head-down, buttocks-up" position, especially as labor approaches, to allow the fetal head to enter the pelvis for easier delivery. As the fetus descends, it exerts pressure on the mother's genital area and sacrum, causing a sensation of heaviness or dragging in the vaginal region. The larger the fetus, the more pronounced this sensation and pressure become, increasing the strain on the vaginal walls and making vaginal wall prolapse more likely.

2. Vulvar Varicose Veins

In late pregnancy, the growing fetus impedes venous blood return from the lower limbs, leading to sustained elevation of venous pressure in the vulvar region. Additionally, blood volume increases during late pregnancy while venous walls become thinner, which can result in vulvar varicose veins and contribute to vaginal wall prolapse.

3. Excessive Pressure on the Lower Body

For women who have given birth two or more times, repeated deliveries may reduce vaginal elasticity. Combined with continuous pressure from the enlarged uterus, the weakened and relaxed vaginal walls are more prone to prolapse.

Besides the above factors, pelvic floor muscle relaxation can also lead to these symptoms. Pregnant women are advised to pay close attention to their health and ensure the well-being of both themselves and their babies. If any discomfort occurs, prompt medical consultation is recommended.