Stomach Pain During Pregnancy: Causes and When to Worry

• Most pregnancy stomach pain is benign — round ligament pain, gas, constipation, reflux or a mild stomach bug.
• The cause shifts by trimester: ectopic pregnancy and miscarriage matter most early; preeclampsia, placental abruption and preterm labour matter most later.
• Gallstones and appendicitis are the leading non-obstetric surgical emergencies — and both can be missed in pregnancy because the pain sits in an unusual place.
• Red flags: severe constant pain, any vaginal bleeding, fever, persistent vomiting, reduced fetal movements, or pain with dizziness or fainting.
• Severe one-sided pain in early pregnancy is an ectopic pregnancy until proven otherwise — go to hospital the same hour.
• When in doubt, get checked. Ultrasound, blood tests and even MRI without contrast are safe in pregnancy, so doctors can investigate properly.

Doctors approach pregnancy abdominal pain with a few simple questions, and you can use the same logic at home. First: is the pain linked to the pregnancy itself (obstetric) or a coincidental problem that can happen to anyone (like a stomach bug or appendicitis)? Second: is it the mild, self-limiting kind, or could it be serious? Third: are there warning features alongside it — bleeding, fever, vomiting, reduced fetal movements, or feeling faint — that change how urgently you need to be seen?

The single most useful clue is your trimester, because the likely causes shift as pregnancy progresses. Where the pain sits, how severe it is, what it feels like (sharp and brief versus constant and crushing), and what comes with it complete the picture. None of this replaces a doctor's assessment — but it helps you judge whether to rest, ring your obstetrician, or go straight to hospital.

Early pregnancy (first trimester). The diagnoses that matter most are ectopic pregnancy, threatened or completed Miscarriage: Types, Recovery and Care in India, and ovarian cyst problems such as torsion. Everyday causes include constipation, a stomach bug, and urinary infection. Severe one-sided pelvic pain — especially with shoulder-tip pain, dizziness or vaginal bleeding — is an ectopic pregnancy until proven otherwise and needs same-hour evaluation with a beta-hCG blood test and a transvaginal scan.

Mid pregnancy (second trimester). Pain here is more often benign and driven by your rapidly growing uterus — classic round ligament pain, gentle stretching of the abdominal wall, and pressure on your bladder and bowel. The serious causes not to miss are urinary infection, gallstones, appendicitis, ovarian torsion, and the early start of preeclampsia, which can cause pain under the right ribs.

Late pregnancy (third trimester). Practice tightenings (Braxton Hicks), reflux, gallstones and round ligament pain are common. The emergencies to recognise are placental abruption (severe constant pain, often with bleeding), HELLP syndrome and severe preeclampsia (pain under the right ribs), and preterm labour (regular, rhythmic cramping). Surgical emergencies like appendicitis can still strike at any point.

The good news first: most aches and twinges are nothing to worry about. Here are the usual culprits and how to ease them.

Round ligament pain. The round ligaments run from the top of your uterus down to your groin. As your uterus grows, they stretch — and a sudden move like standing up fast, sneezing, coughing or rolling over in bed can trigger a brief, sharp stab low in the abdomen or groin, usually on one side. It lasts seconds to a minute or two and settles with rest. It is harmless and peaks between weeks 14 and 24. Moving slowly, supporting your bump and a warm pack are usually all you need. Our full guide to round ligament pain in pregnancy explains how to tell it apart from labour.

Constipation. Pregnancy hormones slow the bowel, and iron tablets, low fibre and less activity make it worse. It often causes cramping and a heavy, dragging ache low on the left. Aim for 25–30 g of fibre a day from fruit, vegetables, whole grains like ragi and bajra, and pulses such as moong and chana; drink 2–3 litres of water; and walk daily. If your iron supplement is the problem, ask your doctor about better-tolerated iron forms. For a fuller plan, see our guide to constipation and bloating in pregnancy.

Heartburn and acid reflux. Up to 7 in 10 pregnant women get reflux, especially later on, as hormones relax the valve at the top of the stomach and the growing uterus pushes upward. It burns behind the breastbone or in the upper tummy, worse after meals or lying flat. Eat small, frequent meals, stay upright for 2–3 hours after eating, raise the head of your bed, and go easy on spicy, oily and fried food. Antacids help; H2 blockers and proton pump inhibitors are considered safe under medical advice. See heartburn and acid reflux in pregnancy for an India-specific diet and medicine guide.

Gas and bloating. Slowed digestion traps gas, causing cramps that wander around the abdomen. Indian diets rich in pulses, certain vegetables and dairy can add to it. Eat slowly, avoid fizzy drinks, walk after meals, and learn your personal trigger foods — our pregnancy gas and bloating relief guide has practical fixes.

Mild stomach bug (gastroenteritis). Viral tummy bugs cause crampy pain, diarrhoea and vomiting just as they do outside pregnancy. Hydration is the priority. But if it lasts beyond 24–48 hours, or comes with fever, blood in the stool, signs of dehydration or reduced fetal movements, get reviewed.

Gallstones are one of the most important causes of pain under the right ribs in pregnancy and the weeks after birth, and Indian women carry a notably higher risk. Pregnancy itself makes gallstones more likely: oestrogen pushes more cholesterol into bile, progesterone slows gallbladder emptying, and bile becomes more 'stone-forming'. On top of this, dietary patterns high in saturated fat, rising obesity and genetic factors push prevalence higher in many north and west Indian communities.

Gallstone pain (biliary colic) is a severe, steady ache in the upper-right abdomen or just below the breastbone, often spreading to the right shoulder or back, typically lasting 30 minutes to several hours, and frequently after a fatty meal. Nausea and vomiting are common. Crucially, it is steady rather than coming-and-going — which helps separate it from bowel cramps.

Warning signs that a stone has caused a complication — and that you need urgent hospital care — are fever, yellowing of the eyes or skin (jaundice), relentless vomiting, or marked tenderness. These can signal an inflamed gallbladder (cholecystitis), a blocked bile duct, or pancreatitis.

Diagnosis is mainly by abdominal ultrasound, which is safe, accurate and available across India, supported by blood tests (full blood count, liver function, lipase/amylase). CT is avoided because of radiation; MRI without contrast can be used in selected cases after the first trimester. Many uncomplicated cases are managed conservatively — pain relief with paracetamol, fluids, anti-sickness medicines and a low-fat diet — with surgery deferred until after delivery. But recurrent severe colic, cholecystitis, a duct stone or gallstone pancreatitis are reasons to operate during pregnancy. Laparoscopic (keyhole) gallbladder removal is now considered safe in all trimesters, with the second trimester preferred, and Indian tertiary centres perform it routinely when needed.

Appendicitis is the most common non-obstetric surgical emergency in pregnancy, affecting roughly 1 in 1,500 pregnancies. It is harder to spot because the growing uterus pushes the appendix upward and outward — so instead of the classic lower-right pain, you may feel it in the mid-right or upper-right abdomen, especially in the second and third trimesters. To make things trickier, nausea, mild fever and loss of appetite are common in normal pregnancy too, and examination signs can be unreliable. The result: appendicitis is diagnosed late more often in pregnant women, and a burst appendix is dangerous for both mother and baby.

The typical picture is pain that builds over hours — often starting near the navel and shifting to the right — with loss of appetite, nausea, a low-grade fever and tenderness. Blood tests usually show a raised white cell count and inflammatory markers, and a urine test helps rule out infection. Because CT is avoided, doctors rely on ultrasound first and, increasingly in Indian tertiary centres, MRI without contrast, which is both safe and accurate.

The guiding principle, backed by FOGSI and ACOG, is that operating on a normal appendix is far safer than missing an inflamed one that bursts — so surgeons keep a low threshold to operate even with some uncertainty. Laparoscopic appendix removal is safe in all trimesters and is the procedure of choice in many Indian centres.

The practical takeaway: right-sided abdominal pain that persists beyond a few hours — especially with nausea, vomiting, fever or worsening tenderness — needs urgent assessment. Do not wait, and do not assume it is just gas or constipation. Go to a hospital with both obstetric and general surgical facilities. A normal result is reassuring; an early diagnosis followed by prompt surgery has excellent outcomes for mother and baby.

A few causes of pregnancy abdominal pain are true emergencies. Knowing their fingerprints can save your life and your baby's.

Ectopic pregnancy. When the fertilised egg implants outside the uterus — usually in a fallopian tube — it cannot survive and can rupture. It typically shows up at 6–10 weeks with one-sided pelvic or lower abdominal pain, often with vaginal bleeding or spotting. A rupture causes severe pain, shoulder-tip pain, dizziness, fainting and shock. Any woman of reproductive age with abdominal pain should take a pregnancy test, and a positive test with pain means an urgent scan and beta-hCG. Treatment is methotrexate for small, unruptured cases or surgery (usually keyhole) otherwise. Read more in our guide to ectopic pregnancy signs and care in India.

Placental abruption. This is the placenta separating from the womb wall before birth, usually in the second half of pregnancy. It causes sudden, severe, constant pain, often with vaginal bleeding (though bleeding can be hidden), a hard, tense uterus, and signs of fetal distress. Risk factors include high blood pressure, preeclampsia, trauma, twins and a previous abruption. It is an emergency needing immediate transfer, IV access, blood crossmatch and often urgent caesarean — see placental abruption: emergency recognition.

Preeclampsia and HELLP syndrome. Pain under the right ribs or in the upper-middle abdomen in the second half of pregnancy can signal the liver involvement of severe preeclampsia or HELLP syndrome. It is constant and often comes with headache, visual disturbance, vomiting, swelling or reduced urine output. Anyone with this pattern should have their blood pressure checked immediately. Learn the warning signs in our guide to preeclampsia: high BP and warning signs.

Preterm labour. Labour before 37 weeks shows up as regular, rhythmic abdominal tightening — often with low backache, pelvic pressure, a watery discharge or light bleeding — that grows more frequent over time. Regular cramps every 10–15 minutes or less in the second or third trimester mean you should contact your obstetrician or go to hospital, because early treatment with steroids and other measures protects the baby. See preterm labour: warning signs and care.

Urinary infections are among the most common causes of lower abdominal and pelvic pain in pregnancy, affecting up to 1 in 10 women. Pregnancy hormones widen and slow the urinary tract, sugar appears in urine more easily, and immunity shifts — all of which invite infection. Look for burning when you pass urine, going more often, urgency, pain low down, and sometimes blood in the urine. A simple urine test and culture (routine in Indian antenatal care) confirm it, and a 5–7 day course of a pregnancy-safe antibiotic clears it. Left untreated, a bladder infection can climb to the kidneys and is linked to preterm labour and low birth weight. Our guide to urinary tract changes in pregnancy explains what is normal and what is not.

Pyelonephritis (kidney infection) is more serious and needs hospital admission. It brings high fever, one-sided flank pain, nausea, vomiting and sometimes signs of sepsis, and raises the risk of preterm labour. Treatment is IV antibiotics, fluids and obstetric monitoring, usually for 3–5 days, followed by oral antibiotics to complete the course.

Kidney stones cause severe, cramping flank pain that can spread to the lower abdomen or groin, often with blood in the urine and vomiting. Diagnosis is by ultrasound (MRI in difficult cases; CT is avoided). Most are managed conservatively with hydration and pain relief, with stenting reserved for obstruction or infection.

The practical message: never ignore urinary symptoms or flank pain. Burning urine deserves a urine test; high fever with flank pain deserves a hospital visit. To lower your risk, stay well hydrated, pass urine regularly and don't hold on for long. If infections keep recurring, our guide to recurrent UTIs in Indian women covers prevention and when a urology referral helps.

• Severe pain anywhere in the abdomen lasting more than 30 minutes, or pain that doubles you over or wakes you from sleep
• Any vaginal bleeding with pain, at any stage of pregnancy
• Severe one-sided pelvic pain in early pregnancy, especially with shoulder-tip pain, dizziness or fainting (possible ectopic pregnancy)
• High fever above 38°C, particularly with flank pain or urinary symptoms
• Persistent vomiting when you cannot keep fluids down
• Reduced or absent fetal movements after 24 weeks
• Sudden severe pain under the right ribs in the second half of pregnancy, especially with headache, visual changes, swelling or breathlessness — have your blood pressure checked
• Regular tightening or cramping every 10 minutes or less in the second or third trimester (possible preterm labour)
• Any pain after a fall, road accident or blow to the abdomen, even if it seems mild (risk of placental abruption)

• Round ligament pain: move slowly when standing or turning, support your bump with one hand, and use a warm pack. A maternity support belt helps if it is frequent.
• Constipation: more fibre (ragi, bajra, fruit, pulses), 2–3 litres of water, daily walking, and never postpone the urge. Bulk-forming laxatives like isphagula husk are safe.
• Reflux: small frequent meals, stay upright after eating, raise the head of the bed, and cut spicy, oily and fried food; antacids give quick relief.
• Gas and bloating: eat slowly, skip fizzy drinks, walk 10–15 minutes after meals, and learn your trigger foods. Curd and lassi may help some women.
• Stay active safely: gentle, regular movement eases constipation, gas and backache — see our trimester-by-trimester pregnancy exercise guide.

A myth worth dropping: that pregnancy stops doctors from properly investigating your pain. It does not. Evaluation starts with a careful history (timing, site, character, severity and any bleeding, fluid loss or reduced movements) and an examination of your vital signs, abdomen and uterus. After about 24–26 weeks, the baby's heartbeat is monitored too.

Blood and urine tests are tailored to the suspected cause — full blood count, urine analysis and culture, liver and kidney function, lipase or amylase, inflammatory markers, clotting and, in early pregnancy, beta-hCG. A blood group and crossmatch are arranged if surgery or transfusion might be needed.

Imaging is chosen carefully but is far from off-limits. Ultrasound is the workhorse — safe at every stage and widely available across India — for the uterus, placenta, gallbladder, kidneys, ovaries and free fluid. MRI without contrast is increasingly used in Indian tertiary centres for tricky cases like suspected appendicitis, especially later in pregnancy. CT is generally avoided because of radiation but can be used in critical situations when the benefit clearly outweighs the small fetal risk. In complex cases, obstetrics, surgery, gastroenterology and urology teams review you together, with the shared aim of a fast diagnosis that protects both you and your baby.

• ACOG — Practice guidance on abdominal pain and surgery in pregnancy
• NHS — Stomach pain in pregnancy
• RCOG — Ectopic pregnancy and management guidance
• FOGSI — Federation of Obstetric and Gynaecological Societies of India
• ICMR-NIN — Dietary Guidelines for Indians
• WHO — Recommendations on antenatal care for a positive pregnancy experience