Your stomach can hurt, growl, bloat, or burn for dozens of reasons, and the specific sensation you’re feeling is the biggest clue to what’s going on. Most stomach complaints trace back to one of a handful of common causes: excess gas, acid irritation, food moving through your gut, stress, or something you ate. Knowing where the discomfort sits, when it started, and what makes it better or worse helps narrow things down fast.
Why Your Stomach Hurts
Abdominal pain is one of the most common reasons people search for health information, and location matters more than most people realize. Your abdomen houses over a dozen organs, and pain in different quadrants points to different sources.
Upper right pain often involves the gallbladder or liver. Gallstones and gallbladder inflammation are the most frequent culprits in that area, though kidney stones and infections can radiate there too. Upper left pain is more likely tied to your actual stomach: gastritis (inflammation of the stomach lining), ulcers, or pancreatitis. Lower right pain is the classic spot for appendicitis. Lower left pain in adults commonly comes from diverticulitis, where small pouches in the colon wall become inflamed or infected.
Pain that’s hard to pinpoint, sitting vaguely around your belly button or spread across your whole abdomen, is more typical of gas, indigestion, or a stomach bug. That diffuse, crampy quality usually signals something happening inside the intestines rather than a single organ in trouble.
Why Your Stomach Growls
Stomach growling and rumbling happen because your digestive tract is a muscular tube that contracts in rhythmic waves. Your stomach’s smooth muscles cycle through about three contractions per minute, pushing food, fluid, and gas forward. When those contractions squeeze around pockets of air or liquid, you hear it.
Growling doesn’t necessarily mean you’re hungry. It happens between meals because your digestive system runs a “cleaning cycle” that sweeps leftover debris through the intestines. This is completely normal. It also happens after eating, as food gets mixed and moved along. The sounds get louder when there’s more gas in the mix, which is why certain meals (beans, carbonated drinks, high-fiber foods) make your gut noisier.
Persistent, unusually loud gurgling can sometimes signal something worth paying attention to, like a partial bowel obstruction, bacterial overgrowth in the small intestine, or a food intolerance like celiac disease. If the noise comes with pain, bloating that doesn’t resolve, or changes in your bowel habits, that’s a different story than the occasional rumble.
Why Your Stomach Feels Bloated
Bloating comes from three sources: your gut bacteria producing gas, swallowed air, or your intestines not moving things through efficiently. Sometimes it’s a perception issue too. Some people feel bloated with a normal amount of gas because their gut is more sensitive to stretching.
About 74% of the gas in your intestines comes from bacteria fermenting carbohydrates that your small intestine didn’t fully absorb. When undigested sugars, starches, or fiber reach the colon, bacteria break them down and release hydrogen, methane, and carbon dioxide. This is a normal part of digestion, but eating more fermentable carbohydrates than usual (think onions, garlic, wheat, apples, or legumes) ramps up production.
Swallowed air accounts for most of the gas in your upper gut. You swallow small amounts of air every time you eat or drink, but the volume increases noticeably with gum chewing, smoking, drinking through straws, or eating quickly. That air either comes back up as a burp or travels down into the intestines.
Why Your Stomach Burns
A burning feeling in your upper abdomen or behind your breastbone usually involves stomach acid landing where it shouldn’t, or irritating a spot that’s already damaged.
Gastritis, the inflammation of your stomach lining, is one of the most common causes. The leading trigger is a bacterial infection with H. pylori, a bug that roughly half the world’s population carries. Other frequent causes include overuse of anti-inflammatory painkillers like ibuprofen, heavy alcohol use, and physical stress from illness or injury. Gastritis can feel like a gnawing or burning ache in the upper middle part of your abdomen.
Stomach ulcers take this a step further. They’re actual sores in the stomach lining, and the pain typically kicks in soon after eating. Acid reflux (GERD), by contrast, tends to flare after fatty foods, caffeine, or lying down, and the burn sits higher, behind the sternum. That positional difference, worse when you recline versus worse right after a meal, is one of the simplest ways to tell reflux apart from an ulcer.
Why Stress Makes Your Stomach React
The connection between your brain and your gut is direct and powerful. When you’re stressed, your body releases cortisol and adrenaline as part of the fight-or-flight response. These hormones don’t just affect your heart rate and muscles. They change how your digestive system moves, how much acid it produces, and how sensitive your gut nerves are to normal sensations.
Chronic stress does something more lasting. Prolonged cortisol exposure activates immune cells in the gut wall, triggers low-grade inflammation, disrupts the barrier that keeps intestinal contents where they belong, and shifts the balance of gut bacteria. The result is a gut that contracts abnormally and feels pain more intensely. Research in animal models shows that just seven to ten days of repeated stress exposure measurably increases the gut’s sensitivity to stretching and pressure. This is why people with ongoing anxiety or work stress often develop persistent stomach symptoms that don’t have an obvious structural cause.
Why Certain Foods Bother You
Food intolerances are distinct from allergies. An allergy involves your immune system and can cause a reaction within minutes, sometimes life-threatening. An intolerance is a digestive problem: your body can’t properly break down or absorb a particular component of food, and symptoms show up within a few hours as the food moves through your system.
The usual suspects are lactose (the sugar in dairy), fructose (a sugar concentrated in some fruits, honey, and high-fructose corn syrup), and gluten (a protein in wheat, barley, and rye). The symptoms overlap heavily: belly pain, gas, bloating, diarrhea, nausea, and sometimes headaches. Because the symptoms are so similar across different intolerances, identifying your specific trigger usually requires an elimination diet, where you remove suspect foods for a few weeks and reintroduce them one at a time.
Timing can help narrow things down. If your stomach reliably acts up 30 minutes to two hours after dairy, lactose intolerance is a strong possibility. If symptoms are more unpredictable, consider whether you’re reacting to FODMAPs, a group of fermentable carbohydrates found in a wide range of foods from garlic to watermelon.
Quick Relief Options
Over-the-counter stomach remedies work through different mechanisms, so choosing the right one depends on what’s causing your discomfort.
- Antacids (calcium carbonate, magnesium hydroxide, aluminum hydroxide) work by directly neutralizing stomach acid. They also deactivate pepsin, the enzyme that digests protein in your stomach, once they raise the local pH above 4. Relief is fast, often within minutes, but short-lived.
- H2 blockers reduce acid production at the source rather than neutralizing what’s already there. They take 30 to 60 minutes to kick in but last several hours, making them better for preventing symptoms you know are coming, like nighttime reflux.
- Proton pump inhibitors (PPIs) shut down acid production more completely and are designed for daily use over days or weeks. They’re the strongest option but take one to three days of regular use before reaching full effect.
For bloating and gas, simethicone helps break up gas bubbles but won’t prevent new gas from forming. If your bloating is driven by bacterial fermentation of certain carbohydrates, reducing those foods will do more than any medication.
Signs That Need Urgent Attention
Most stomach discomfort is benign, but certain combinations of symptoms signal something that needs immediate evaluation. Severe abdominal pain with a rigid or distended belly, vomiting bile (green or yellow fluid), signs of internal bleeding like vomiting blood or dark tarry stools, or pain accompanied by fever and an inability to keep fluids down all warrant a trip to the emergency room.
For people over 50, new or unusual abdominal pain deserves extra caution because it can occasionally indicate an abdominal aortic aneurysm, especially if the pain radiates to the back or flank. Sudden, intense lower-right pain in anyone warrants evaluation for appendicitis. And for anyone who could be pregnant, abdominal pain in early pregnancy should always be assessed to rule out an ectopic pregnancy.