How does pregnancy increase hemorrhoid risk, supported by hormonal and vascular changes, and how do outcomes differ between women who undergo vaginal delivery and those with cesarean section?

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How does pregnancy increase hemorrhoid risk, supported by hormonal and vascular changes, and how do outcomes differ between women who undergo vaginal delivery and those with cesarean section?

Pregnancy significantly increases hemorrhoid risk due to a combination of hormonal and vascular changes, as well as the physical pressure of the growing fetus. The outcomes of hemorrhoids often differ between women who undergo a vaginal delivery versus a cesarean section, with vaginal delivery carrying a higher risk of developing new or worsening existing hemorrhoids during labor. However, hemorrhoids can still occur with a C-section, as the risk factors during pregnancy itself remain.

How Pregnancy Increases Hemorrhoid Risk

The increased risk of hemorrhoids during pregnancy is a result of a perfect storm of physiological changes that put added pressure on the veins in the rectal area.

Hormonal Changes: The body produces higher levels of the hormone progesterone during pregnancy. Progesterone has a relaxing effect on the body’s smooth muscles, including the walls of the blood vessels. This makes the veins more prone to swelling and distension, which can lead to hemorrhoid formation. Additionally, progesterone slows down the digestive system, which contributes to constipation.
Vascular and Circulatory Changes: Pregnancy causes a significant increase in total blood volume to support the growing fetus. This added volume puts extra strain on the entire circulatory system. At the same time, the inferior vena cavathe large vein that receives blood from the lower bodyis compressed by the growing uterus. This compression impairs the return of blood from the lower extremities and the rectal area back to the heart, causing blood to pool in the veins and leading to swelling.
Physical Pressure and Constipation: As the uterus and fetus grow, they exert increasing pressure on the pelvis and the intestines. This physical pressure can slow down bowel movements and, combined with the hormonal effects of progesterone, can lead to chronic constipation. Straining during bowel movements is one of the most common causes of hemorrhoids.

Outcomes: Vaginal Delivery vs. Cesarean Section

The method of delivery has a direct impact on the risk of developing hemorrhoids, particularly in the immediate postpartum period.

Vaginal Delivery: Vaginal delivery significantly increases the risk of developing or worsening hemorrhoids. The intense straining and pushing during labor place immense and prolonged pressure on the veins in the rectal area. This pressure can cause existing hemorrhoids to prolapse or thrombose (form a blood clot), and it can also cause new hemorrhoids to form. A large-scale prospective cohort study found that straining during delivery for more than 20 minutes was an independent risk factor for postpartum hemorrhoids.
Cesarean Section: A cesarean section bypasses the straining of vaginal delivery. While women who have a C-section may still have hemorrhoids from the pregnancy itself, they are less likely to experience the dramatic worsening of symptoms that can occur with a vaginal birth. However, a C-section does not provide complete protection. Women who undergo a C-section are still at risk for hemorrhoids due to the hormonal and vascular changes of pregnancy, as well as the constipation that can occur in the postpartum period due to pain medication or a fear of bowel movements after surgery.

In conclusion, pregnancy is a major risk factor for hemorrhoids due to a combination of hormonal, circulatory, and physical factors. While the intense straining of a vaginal delivery significantly increases the risk of new or worsened hemorrhoids, a cesarean section does not completely eliminate that risk, as the underlying risk factors from the pregnancy remain.

I’m Mr.Hotsia, sharing 30 years of travel experiences with readers worldwide. This review is based on my personal journey and what I’ve learned along the way. Learn more