Constipation in Pregnancy: Why It Happens, What Helps, and When It Needs Attention
Woman experiencing tiredness during early pregnancy.
Constipation in pregnancy is one of those symptoms that affects a large proportion of women — estimates range from 11 to 40% across all trimesters — and is consistently under-addressed at antenatal appointments, partly because it seems minor compared to other pregnancy concerns, and partly because women feel embarrassed to raise it.
It is not minor when it is causing daily discomfort, straining, haemorrhoids, and significant distress. And it has predictable causes and effective solutions that deserve to be discussed openly.
Dr. Shachi Singh, consultant obstetrician at Prakash Hospital, Sector 33, Noida, explains why pregnancy causes constipation, what the evidence actually supports for relief, which medications are safe, and when constipation signals something that needs clinical attention.
Why Pregnancy Causes Constipation
Progesterone: The dominant culprit. Progesterone relaxes smooth muscle throughout the body — including the smooth muscle of the intestinal wall. Intestinal peristalsis (the wave-like contractions that move food through the bowel) slows significantly under progesterone's influence. Food spends longer in the colon, more water is absorbed from it, and the stool becomes harder and more difficult to pass.
The growing uterus: As the uterus enlarges, it physically compresses the sigmoid colon and rectum. This mechanical pressure reduces the space available for stool to move and be expelled.
Iron supplements: A significant contributor that is often overlooked. Iron tablets — which most pregnant women take — cause constipation in a substantial proportion of users. The form of iron matters: ferrous sulphate is the most constipating; ferrous gluconate and ferrous ascorbate are generally better tolerated. If constipation began or worsened after starting iron tablets, this is the most likely culprit.
Reduced activity: Many pregnant women, particularly in the third trimester, are less active than before pregnancy. Physical activity stimulates bowel motility — its reduction contributes to sluggish bowel function.
Dehydration: Inadequate water intake concentrates the stool. In India's climate, women who are not drinking enough water commonly have harder stools.
Prenatal vitamins: Some prenatal vitamin formulations contain high-dose iron that can worsen constipation.
Symptoms and When It Becomes a Problem
Normal bowel frequency varies widely — from three times daily to three times weekly. Constipation is not defined by frequency alone but by the difficulty, straining, and discomfort involved.
Signs that constipation has become significant:
- Fewer than three bowel movements per week
- Hard, dry, difficult-to-pass stools
- Significant straining required
- Feeling of incomplete emptying after defecation
- Abdominal cramping or bloating related to the bowels
- Fresh bright red blood on the toilet paper or surface of stool — usually indicating haemorrhoids or anal fissures from straining
Dietary Changes That Work
1. Increase Fibre
The most effective dietary intervention. Dietary fibre absorbs water and adds bulk to stool, making it softer and easier to pass. The recommended fibre intake during pregnancy is 28 grams per day — most Indian women consume significantly less.
High-fibre Indian foods to increase:
- Fresh fruits with skin: guava (excellent source), pear, apple with skin, papaya, figs, dates
- Vegetables: palak (spinach), lauki (bottle gourd), turai (ridge gourd), beans, peas, sweet potato
- Whole grains: whole wheat atta, oats, brown rice, bajra, jowar
- Legumes: chana, rajma, dal, lentils of all varieties
- Seeds: flaxseed (alsi) — add 1 to 2 teaspoons to dahi, roti atta, or smoothies; high in both fibre and omega-3 fatty acids
- Dry fruits: figs (anjeer), prunes (alu bukhara) — 3 to 5 prunes daily have good evidence for relieving constipation
Prunes deserve specific mention. Prunes (dried plums, alu bukhara) contain sorbitol — a natural laxative — plus fibre and dihydroxyphenyl isatin, which stimulates bowel motility. Studies consistently show prunes are more effective than psyllium husk for constipation. 3 to 5 prunes daily or a small glass of prune juice in the morning is a practical, safe, and effective approach.
2. Stay Well Hydrated
Aim for 8 to 10 glasses of water daily. Warm water, particularly in the morning before eating, stimulates bowel movement in many people. Warm water with lemon first thing in the morning is a widely used and effective home approach.
3. Increase Physical Activity
Walking 20 to 30 minutes daily significantly stimulates bowel motility. Gentle prenatal yoga, particularly poses involving hip and abdominal movement, helps. Even short regular walks are better than staying sedentary.
4. Review Iron Supplements
If constipation began after starting iron tablets, discuss with your doctor whether switching to a less constipating formulation (ferrous gluconate, ferrous ascorbate, or a different preparation) is appropriate. Do not stop iron supplementation without medical guidance — anaemia in pregnancy is dangerous — but the formulation can sometimes be changed.
Safe Laxatives in Pregnancy
When dietary changes alone are not sufficient, several laxatives are safe in pregnancy:
Isabgol (psyllium husk): A bulk-forming laxative. Absorbs water in the colon, softening and bulking the stool. Safe throughout pregnancy. Must be taken with adequate water — insufficient hydration can make it counterproductive. Available at any pharmacy in India. 1 to 2 teaspoons stirred into water or dahi, once or twice daily.
Lactulose: An osmotic laxative. Draws water into the colon, softening the stool. Safe in pregnancy. Available as a syrup (Duphalac and similar brands). Takes 24 to 48 hours to work — not an immediate solution.
Polyethylene glycol (PEG / Movicol): An osmotic laxative. Safe in pregnancy. Soft bulking effect.
Glycerine suppositories: Provide local rectal stimulation for immediate effect. Safe in pregnancy for occasional use.
Senna (stimulant laxative): Generally considered safe for occasional short-term use in pregnancy, though some guidelines recommend caution in the third trimester. Discuss with your doctor.
Castor oil: Avoid. Can trigger uterine contractions and is not appropriate in pregnancy.
Haemorrhoids: The Consequence of Constipation
Haemorrhoids (piles) are common in pregnancy — both because of constipation and straining, and because the growing uterus increases pressure on the rectal venous drainage. Symptoms include:
- Bright red blood on the toilet paper or stool surface after defecation
- Itching or discomfort around the anus
- A feeling of something prolapsing at the anal opening
Haemorrhoids in pregnancy are managed with stool softening (so straining is minimised), topical preparations (lignocaine-containing creams such as Anovate for symptomatic relief, haemorrhoid creams), and sitz baths (soaking in warm water for 10 to 15 minutes). Most haemorrhoids improve after delivery when the pressure on the rectal veins is relieved.
Warning Signs That Need Medical Assessment
Most constipation in pregnancy is straightforward. See your doctor if:
- Constipation is severe and not responding to dietary measures and safe laxatives
- You have abdominal pain that is severe, cramping, and not clearly bowel-related
- You are passing blood in the stool (not just on the toilet paper from haemorrhoids, but mixed within the stool)
- You have significant bloating with complete absence of gas or stool passage — possible bowel obstruction
- Constipation alternates with sudden diarrhoea
Antenatal Care in Noida and Greater Noida
Dr. Shachi Singh at Prakash Hospital, Sector 33, Noida, addresses all pregnancy symptoms including constipation as part of comprehensive antenatal care for women across Noida and Greater Noida.
To book a consultation with Dr. Shachi Singh, call: +91 97023 46853
Clinic Hours: Monday to Saturday, 9 AM – 6 PM | Sunday, 10 AM – 2 PM
Clinic Address: D-12A, 12B, Sector-33, G.B. Nagar, Noida, Uttar Pradesh 201301
Frequently Asked Questions
1. Is constipation normal in pregnancy?
Yes — progesterone slows bowel motility throughout pregnancy. It is very common. Normal does not mean untreatable — dietary changes and safe laxatives resolve most cases.
2. Is it safe to take lactulose (Duphalac) during pregnancy?
Yes — lactulose is safe throughout pregnancy. It is an osmotic laxative that draws water into the colon and does not have systemic absorption.
3. Can straining at the toilet harm the baby?
Straining itself does not directly harm the baby. However, it worsens haemorrhoids and is uncomfortable. Consistent efforts to soften the stool remove the need for straining.
4. Are prunes safe in pregnancy?
Yes — prunes are a whole food with excellent evidence for constipation relief. They contain sorbitol, fibre, and natural bowel-stimulating compounds. 3 to 5 prunes daily or a small glass of prune juice is safe and effective.
This blog is written for educational and informational purposes only. Please consult Dr. Shachi Singh or a qualified obstetrician for guidance specific to your pregnancy.
