Pregnant women develop piles due to increased uterine pressure on pelvic veins, progesterone effects on vein walls and pregnancy-related constipation. Learn all the causes.
Why Piles Are Common During Pregnancy
Piles (haemorrhoids) affect an estimated 25–35% of pregnant women, most commonly in the second and third trimesters. The high prevalence is not coincidental — pregnancy creates several simultaneous physiological conditions that directly promote haemorrhoidal development.
The 5 Reasons Pregnancy Causes Piles
**1. Increased Uterine Pressure on Pelvic Veins** As the uterus grows — particularly in the second and third trimesters — it exerts direct mechanical pressure on the inferior vena cava and iliac veins. This reduces venous return from the lower body, causing blood to pool in the pelvic and anorectal veins, engorging haemorrhoidal cushions.
**2. Progesterone Effects on Vein Walls** Progesterone, which rises significantly during pregnancy, relaxes smooth muscle including the walls of blood vessels. This reduces venous tone, allowing haemorrhoidal veins to dilate more easily with increased blood flow.
**3. Pregnancy-Related Constipation** Progesterone also slows intestinal motility — constipation affects 40–50% of pregnant women. Iron supplementation (routinely prescribed in India for anaemia during pregnancy) worsens constipation further. Hard stools require straining, which directly engorges haemorrhoidal veins.
**4. Increased Blood Volume** Pregnancy increases total blood volume by 30–50%. This increased circulating blood volume is distributed throughout the body, including the haemorrhoidal venous plexus.
**5. Increased Intra-Abdominal Pressure** The growing uterus increases intra-abdominal pressure — the same mechanism by which obesity and heavy lifting cause piles. This pressure is transmitted to rectal veins continuously.
When in Pregnancy Are Piles Most Common?
- **First trimester:** Less common — uterus not yet large enough to compress pelvic veins significantly. However, progesterone effects begin from conception.
- **Second trimester (13–28 weeks):** Increasing uterine pressure begins. Constipation often peaks.
- **Third trimester (28–40 weeks):** Maximum uterine pressure on pelvic veins. Piles most symptomatic.
- **During and immediately after labour:** Pushing during vaginal delivery creates intense Valsalva pressure — many women who had no previous symptoms develop piles immediately after delivery.
Frequently Asked Questions
**Q: Will pregnancy piles go away after delivery?** A: Many piles that develop during pregnancy reduce significantly within 4–6 weeks of delivery as uterine pressure resolves and hormones normalise. Grade I–II postpartum piles often fully resolve. Grade III–IV may persist and require post-delivery treatment.
**Q: Can piles harm the baby?** A: Haemorrhoids are in the mother's circulation and do not affect the baby's blood supply or development. They are a maternal discomfort condition, not a fetal risk.
Book a Safe Pregnancy Piles Consultation
At RectoRelief Hospital, piles during pregnancy are managed with safe, non-surgical approaches. Book a consultation with Dr. Sudhanshu Chaudhary for pregnancy-appropriate treatment.