Severe stomach pain has dozens of possible causes, ranging from something as simple as trapped gas to conditions that need emergency surgery. The location of your pain, when it started, and what other symptoms you have are the biggest clues to what’s going on. Here’s how to narrow it down.
Where the Pain Is Matters Most
Your abdomen contains many different organs packed into a relatively small space, and each one produces pain in a somewhat predictable spot. Paying attention to exactly where it hurts can point you (and a doctor) toward the right cause faster than almost any other detail.
Upper right side: The liver, gallbladder, and right kidney live here. Pain in this area, especially after a fatty meal, often signals gallstones. Gallstone pain typically radiates to your back or under your right shoulder blade and comes with nausea.
Upper middle or left side: This is classic territory for stomach and pancreas problems. A burning or gnawing sensation between meals or at night often points to gastritis (inflammation of the stomach lining) or an ulcer. If you feel intensely hungry one to three hours after eating, that pattern is more typical of an ulcer.
Around the belly button: Pain centered here usually involves the small intestine. It’s also the starting point for appendicitis, which begins as a vague ache near the navel before migrating to the lower right side over several hours.
Lower right side: The appendix sits here, along with the right ovary and fallopian tube in women. Appendicitis pain that has settled into this spot tends to sharpen and worsen when you move, cough, or press on it.
Lower left side: Severe pain here, particularly in adults over 40, may signal diverticulitis, an infection in small pouches that form along the colon wall.
Lower abdomen and pelvis (women): Ovarian cysts, ectopic pregnancy, pelvic inflammatory disease, endometriosis, and uterine fibroids can all cause intense pain in this region. If there’s any chance you could be pregnant and you’re having sharp, one-sided lower abdominal pain, that needs urgent evaluation.
Common Causes That Hit Fast
When pain comes on suddenly and severely, the timeline and accompanying symptoms help sort out what’s happening.
Food poisoning typically strikes two to six hours after eating contaminated food. It comes on fast, hits hard with nausea, vomiting, and diarrhea, and usually passes relatively quickly. A stomach virus (viral gastroenteritis) takes longer to develop, with a 24- to 48-hour incubation period before symptoms start. It generally lasts about two days, sometimes longer.
Gallstones cause pain in your mid-upper abdomen that can radiate to your back or right shoulder. The pain often builds to a peak over minutes and may be accompanied by nausea, vomiting, fever, or yellowing of the skin.
Kidney stones produce sharp pain in your lower back or side that radiates down toward your groin. You might notice blood in your urine, painful urination, or an urgent need to go more frequently. The pain often comes in waves as the stone moves.
Appendicitis follows a distinctive pattern. It starts as a dull ache around your belly button, hovers or comes and goes for several hours, then intensifies as nausea and vomiting develop. After the nausea passes, the pain shifts to your lower right abdomen and becomes constant and sharp. This progression can unfold over 12 to 24 hours.
Pain That Keeps Coming Back
If your stomach has been hurting repeatedly for weeks or months, two of the most common explanations are irritable bowel syndrome (IBS) and inflammatory bowel disease (IBD), and they’re very different conditions despite the similar names.
IBS is a syndrome, meaning it’s defined by a pattern of symptoms rather than visible damage. The hallmarks are chronic abdominal pain, bloating, gas, and constipation alternating with diarrhea. Pain often improves after a bowel movement. To meet the diagnostic threshold, you’d typically have abdominal discomfort for at least 12 weeks out of the past year, along with changes in how often you go or what your stool looks like. Colonoscopies and imaging come back normal in IBS because there’s no structural damage to the intestines.
IBD (which includes Crohn’s disease and ulcerative colitis) causes actual inflammation that shows up on scans and scopes. It can permanently damage the intestines and carries an increased risk of colon cancer. Red flags that point toward IBD rather than IBS include unexplained weight loss, anemia, bloody stool, and fever.
Foods That Trigger Severe Cramping
Certain short-chain carbohydrates called FODMAPs are notoriously difficult to digest. When bacteria in your gut ferment them, they produce hydrogen gas, leading to bloating, cramps, pain, and either constipation or diarrhea. If your pain consistently follows meals, these foods are worth examining.
High-FODMAP foods include apples, pears, peaches, honey, high fructose corn syrup, milk, yogurt, ice cream, onions, garlic, broccoli, mushrooms, asparagus, beans, lentils, barley, rye, beer, wine, fruit juices, and soft drinks. People with IBS are especially sensitive to these, and a temporary low-FODMAP elimination diet supervised by a dietitian is one of the most effective ways to identify your personal triggers.
Over-the-Counter Relief and Its Limits
For mild to moderate stomach pain, OTC options like antacids, gas-relief tablets, and pink bismuth liquid can help. Bismuth-based products (the active ingredient in Pepto-Bismol) should not be given to children under 12 or to kids and teens recovering from the flu or chickenpox. They’re also not appropriate if you have a bleeding disorder, kidney disease, gout, or a known stomach ulcer, since the salicylate component can worsen all of these. If you’re breastfeeding, skip bismuth products entirely.
Anti-inflammatory painkillers like ibuprofen and aspirin can actually make stomach pain worse by irritating the lining of the stomach. If you need pain relief while your stomach is hurting, acetaminophen is generally a safer choice for the stomach itself, though it won’t reduce inflammation.
When Stomach Pain Is an Emergency
Sudden, severe abdominal pain that doesn’t let up is sometimes a sign you need urgent care. Clinicians describe this as an “acute abdomen,” and it can indicate a condition requiring surgery. Specific warning signs that warrant an ER visit include:
- A rigid or distended abdomen that’s visibly swollen and hard to the touch
- Pain that worsens when you lightly press on your belly or when you cough, suggesting inflammation of the abdominal lining
- Vomiting blood or bile (green or yellow vomit)
- Blood in your stool or black, tarry stools
- Fever with severe pain
- Fainting or dizziness with abdominal pain
- Pain following abdominal trauma
For adults over 50, severe abdominal, flank, or back pain deserves extra caution. An abdominal aortic aneurysm, a dangerous bulge in the body’s largest artery, becomes more common with age and can mimic other causes of stomach pain. Elderly patients presenting with abdominal pain have a 14% mortality rate in emergency settings because symptoms are often vague and the body’s tolerance for physiological stress is lower.
If you’re a woman of childbearing age with sudden, severe lower abdominal pain, especially on one side, an ectopic pregnancy (where a fertilized egg implants outside the uterus) needs to be ruled out quickly, as it can become life-threatening if it ruptures.
What to Expect at the Doctor
When you seek care for severe stomach pain, the first priority is identifying whether the situation is urgent. A doctor will check your vital signs, press on different areas of your abdomen, and ask about the timeline, location, and character of the pain. They’ll want to know about vomiting, changes in bowel habits, blood in your stool or urine, fever, and for women, your menstrual cycle and any possibility of pregnancy.
Depending on what the exam suggests, imaging and lab work help confirm a diagnosis. An ultrasound is often the first step for suspected gallstones or kidney stones. A CT scan provides a more detailed look and is commonly used to identify appendicitis, diverticulitis, bowel obstructions, or internal bleeding. Blood tests can reveal signs of infection, inflammation, anemia, or pancreas problems. A urine test can flag kidney stones or urinary tract infections.
For chronic or recurring pain, the workup may eventually include a colonoscopy or upper endoscopy to look directly at the lining of your digestive tract, especially if IBD, ulcers, or celiac disease are suspected.