Stomach pain that won’t go away usually points to one of a handful of common causes: acid irritation, a food intolerance, stress-driven gut sensitivity, or an underlying condition like irritable bowel syndrome. The key to figuring out which one is paying attention to where it hurts, when it gets worse, and what other symptoms come with it. Pain that persists for three months or longer is classified as chronic abdominal pain, and it almost always warrants investigation beyond just waiting it out.
Acid-Related Causes
The most common reason for persistent upper stomach pain is acid doing damage where it shouldn’t. Gastroesophageal reflux disease (GERD) happens when stomach acid repeatedly flows back into the esophagus, irritating its lining. Over time this causes inflammation, painful swallowing, and a burning sensation in the chest or upper abdomen that many people mistake for simple heartburn. If the acid exposure keeps going, it can create ulcers in the esophageal lining, scarring that narrows the esophagus, and in 5% to 10% of people with long-standing GERD, precancerous cell changes known as Barrett’s esophagus.
Peptic ulcers, which are sores in the stomach lining or the upper part of the small intestine, are another major source. The pain tends to feel like a gnawing or burning between meals or at night. Most people assume ulcers come from a bacterial infection called H. pylori, but recent data tells a different story: only about 1 in 5 peptic ulcers is now linked to H. pylori. The majority are caused by regular use of common anti-inflammatory painkillers like ibuprofen or aspirin. If you’ve been taking these frequently for headaches, joint pain, or anything else, they could be the reason your stomach won’t settle down.
IBS and Inflammatory Bowel Disease
If your pain is lower in the abdomen and comes with changes in how often you go to the bathroom or what your stool looks like, irritable bowel syndrome (IBS) is one of the most likely explanations. IBS causes chronic abdominal pain, bloating, gassiness, and a pattern of constipation alternating with diarrhea. The pain often flares after large meals or during stressful periods, and it typically eases temporarily after a bowel movement. Doctors diagnose IBS when you’ve had abdominal discomfort for at least 12 weeks over the past year, along with changes in stool frequency or consistency. Importantly, IBS doesn’t cause visible inflammation or permanent damage to your intestines. There’s nothing abnormal to see on a colonoscopy.
Inflammatory bowel disease (IBD), which includes Crohn’s disease and ulcerative colitis, is less common but more serious. Unlike IBS, IBD causes destructive inflammation that shows up clearly on imaging and can permanently harm the intestines. The distinguishing symptoms are bleeding, anemia, unexplained weight loss, and fever. If your ongoing stomach pain comes with any of those, the situation is different from IBS and needs diagnostic workup.
Gallbladder Pain
Pain that centers under your right ribcage, especially after eating, may be coming from your gallbladder rather than your stomach. This is called biliary colic, and it happens when gallstones block the ducts that carry bile. The classic trigger is a large or fatty meal: fats in your small intestine signal the gallbladder to squeeze and release bile for digestion, and if a stone is in the way, the result is intense cramping pain in the upper right abdomen. Episodes can last anywhere from 15 minutes to several hours, and they tend to recur. Many people live with mild gallbladder symptoms for months before realizing what’s causing them.
Food Intolerances
If your stomach hurts predictably after eating certain foods, an intolerance is worth considering. Lactose intolerance is the most recognized example. Symptoms, including cramping, bloating, gas, and diarrhea, typically begin within a few hours of consuming dairy. But lactose isn’t the only culprit. Fructose (found in fruit, honey, and many processed foods) and gluten can cause similar patterns. The tricky part is that intolerance symptoms overlap heavily with IBS, and many people have both. Keeping a food diary for two to three weeks, noting what you eat and when pain strikes, is one of the most practical first steps you can take before any medical testing.
How Stress Keeps Your Gut in Pain
If you’ve noticed your stomach hurts more during anxious or stressful periods, that’s not in your head. Your gut and brain are connected through a network of nerves, most notably the vagus nerve, that allows emotional states to directly influence digestion. Stress changes how fast your gut moves, how permeable your intestinal lining is, and even the composition of your gut bacteria. All of these shifts can amplify pain signals.
What makes this especially frustrating is that stress can also lower the threshold at which your gut registers pain in the first place, a phenomenon called visceral hypersensitivity. Essentially, your nervous system turns up the volume on normal digestive sensations until they register as painful. This is a core feature of functional gut disorders like IBS, and it explains why the pain can feel very real and very physical even when scans and blood work come back normal. The nerve pathways involved are also tied to nausea, anxiety, and the general sense of dread that often accompanies gut flare-ups.
What Doctors Look For
When stomach pain persists, doctors typically start with blood work: a complete blood count to check for anemia or signs of infection, an electrolyte and kidney function panel to flag liver issues, and sometimes an albumin test to assess nutritional status. A stool test can reveal microscopic blood, white blood cells, or evidence of food intolerances.
If those initial tests don’t explain your symptoms, imaging and scoping come next. An upper endoscopy lets doctors visually examine the lining of your stomach and esophagus for ulcers, inflammation, or infection. A colonoscopy examines the full length of the colon and is the standard tool for distinguishing IBS from IBD. For harder-to-reach areas of the small intestine, options include a CT scan, a capsule endoscopy (you swallow a pill-sized camera that records as it passes through), or a specialized procedure using a flexible tube with small balloons to pull sections of intestine into view. The specific tests your doctor orders depend on where your pain is, how long it’s lasted, and what other symptoms you have.
When the Pain Is an Emergency
Most persistent stomach pain is not dangerous, but certain patterns require immediate care. If pain is sudden, severe, and doesn’t ease within 30 minutes, that warrants an emergency visit. The same applies to continuous severe pain accompanied by nonstop vomiting. Appendicitis typically presents as escalating pain in the lower right abdomen, often with nausea, loss of appetite, and fever. Acute pancreatitis causes pain in the middle upper abdomen that can last days and worsens after eating, sometimes accompanied by fever and a rapid pulse. Severe abdominal pain with vaginal bleeding can signal an ectopic pregnancy.
Outside of emergencies, pain that has been coming and going for weeks or months deserves medical attention rather than continued self-management. The earlier conditions like ulcers, celiac disease, or IBD are caught, the simpler they are to treat and the less damage they do over time.