Frequent or intense stomach pain has dozens of possible causes, ranging from something as simple as eating too fast to conditions that need medical attention. The location of your pain, when it happens, and what other symptoms come with it are the biggest clues to what’s going on. Here’s a practical guide to sorting through the most likely explanations.
Where It Hurts Matters
Your abdomen contains many organs packed into a relatively small space, and each one produces pain in a slightly different spot. Paying attention to where your pain concentrates can narrow the possibilities significantly.
Pain in the upper right side, just below your ribs, often points to gallbladder problems, liver inflammation, or an ulcer. Pain in the upper left can signal intestinal issues or, less commonly, problems with the spleen. Lower right pain is the classic location for appendicitis. Lower left pain is more commonly linked to diverticulitis, colitis, kidney stones, or in women, ovarian cysts or pelvic inflammation.
Pain that’s hard to pinpoint, spreading across the middle of your belly or shifting around, often comes from the intestines or stomach itself. This diffuse quality is typical of gas, bloating, food reactions, and functional gut disorders like irritable bowel syndrome.
Common Causes That Come and Go
If your stomach hurts a lot but the pain isn’t constant, appearing after meals or during stressful periods and then fading, the cause is likely one of these recurring triggers.
Gas and bloating: Certain short-chain carbohydrates (found in foods like onions, garlic, wheat, beans, and some fruits) are poorly absorbed in the small intestine. They attract extra water as they pass through, then get fermented by bacteria in the large intestine, producing gas. The combination of water and gas stretches the intestinal wall. For most people this causes mild discomfort, but for those with a sensitive gut, that stretching produces real, sometimes severe pain.
Food intolerances: Lactose intolerance and gluten sensitivity are two of the most common. Both cause cramping, bloating, and sometimes diarrhea within a few hours of eating the trigger food. The pattern (eating a specific food, then pain) is the key diagnostic clue.
Gallbladder attacks: If your pain is in the upper right abdomen and tends to hit after large or fatty meals, gallstones may be the issue. Fats in your small intestine trigger your gallbladder to squeeze out bile for digestion. If a stone blocks the duct during that squeeze, you get what’s called biliary colic: a steady, intense pain that lasts anywhere from 20 minutes to a few hours, then gradually eases.
Acid reflux and ulcers: A burning or gnawing pain in the upper middle abdomen, sometimes worse on an empty stomach or at night, can indicate excess acid irritating the stomach lining or an actual ulcer. Ulcers are frequently caused by a specific type of bacteria that’s treatable.
Constipation: It’s easy to overlook, but backed-up stool causes real abdominal pain, particularly cramping in the lower left. If you haven’t had a bowel movement in a few days and your belly feels tight or tender, this is a likely culprit.
When Your Gut Overreacts to Normal Digestion
Some people experience frequent stomach pain without any visible damage or disease in their digestive tract. This is often caused by visceral hypersensitivity, a condition where your pain threshold for internal organs is lower than normal. Your digestive system has its own extensive network of nerves, sometimes called the “second brain,” with nerve endings in every layer of the digestive organs. These nerves respond to stretching, bacteria, digestive contents, inflammation, and stress signals.
In people with visceral hypersensitivity, the normal processes of digestion, things like food moving through the intestines or mild gas production, register as pain. The nervous system has essentially been trained into a heightened alert state, possibly by repeated physical stress, infection, or emotional stress. This is one of the core mechanisms behind irritable bowel syndrome (IBS), which affects roughly 10 to 15 percent of the population and causes recurring cramping, bloating, diarrhea, constipation, or a mix of both.
If your stomach hurts “a lot” but tests keep coming back normal, this nervous system sensitivity is a very common explanation. It’s a real physiological process, not something imagined, and it responds to specific treatments including dietary changes, stress management, and medications that calm the gut’s nerve signaling.
Stress, Anxiety, and Stomach Pain
The connection between your brain and your gut runs in both directions. Stress and anxiety increase the sensitivity of those gut nerve endings, speed up or slow down digestion, and can trigger cramping, nausea, and diarrhea even when nothing is physically wrong with your digestive organs. If your stomach pain gets noticeably worse during high-stress periods, before exams, during conflicts, or when you’re anxious, the gut-brain connection is likely amplifying your symptoms. Addressing the stress often reduces the pain, sometimes dramatically.
Pain That Needs Urgent Attention
Most stomach pain resolves on its own or responds to straightforward treatment. But certain patterns signal something more serious. Get to an emergency room if you experience:
- Pain so severe it’s hard to move, eat, or drink
- Sudden onset of intense pain that wasn’t building gradually
- High fever alongside abdominal pain
- Blood in your stool or vomit
- Pain after abdominal trauma from an accident or injury
One pattern worth knowing: appendicitis typically starts as a vague ache around the belly button, then within 12 to 18 hours migrates to the lower right side and becomes sharper and more localized. If you notice that migration pattern, especially with fever or nausea, don’t wait it out.
It’s also worth noting that heart problems, including heart attacks, can sometimes present as severe nausea or pain in the upper abdomen under the rib cage, particularly in women. If the pain feels unusual and you can’t explain it, err on the side of getting checked.
How Doctors Figure Out the Cause
If you go in for evaluation, the process usually starts with your description of the pain: where it is, when it started, what makes it better or worse, and what other symptoms you have. That history narrows the possibilities more than any single test.
Ultrasound is typically the first imaging step for upper right abdominal pain or suspected gallbladder problems, since it’s highly accurate for gallstones and doesn’t involve radiation. For suspected appendicitis, ultrasound catches about 83 percent of cases, but if results aren’t clear, a CT scan follows because it’s more sensitive. Kidney stones are generally evaluated with CT rather than ultrasound, since ultrasound has limited ability to detect stones in the urinary tract. For women of reproductive age with pelvic pain, ultrasound is the standard starting point because it effectively identifies ovarian cysts, ectopic pregnancy, and pelvic inflammatory disease.
Blood work, stool tests, and sometimes endoscopy (a camera into the stomach or colon) round out the diagnostic toolkit depending on the suspected cause.
Practical Steps to Reduce Frequent Pain
While the right approach depends on the cause, a few strategies help across many of the most common conditions. Eating smaller meals reduces the workload on your digestive system and decreases the gas and stretching that trigger pain. Keeping a simple food diary for two weeks, noting what you ate and when pain occurred, often reveals patterns that aren’t obvious in the moment.
Reducing high-FODMAP foods (a category that includes wheat, dairy, certain fruits, onions, and legumes) has strong evidence behind it for people with IBS or unexplained bloating. Monash University’s research program has mapped which foods are highest in these fermentable carbohydrates, and a structured elimination diet guided by a dietitian is one of the most effective non-drug treatments available.
Staying hydrated, managing stress through exercise or relaxation techniques, and avoiding large fatty meals if gallbladder pain is suspected are all low-risk steps you can start immediately while working toward a diagnosis.