Stomach pain has dozens of possible causes, ranging from something you ate a few hours ago to a chronic condition that flares up repeatedly. The location, timing, and type of pain all offer clues about what’s going on. Most stomach pain resolves on its own within a day or two, but understanding the pattern helps you figure out whether you’re dealing with something minor or something that needs attention.
Where It Hurts Matters
Your abdomen houses different organs in different zones, so the location of your pain narrows the list of likely causes considerably. Upper-middle pain (right below your ribs and breastbone) points toward your stomach lining, acid reflux, or an ulcer. Pain in the upper right side often involves the gallbladder or liver. Upper left pain can signal problems with the pancreas, spleen, or even the heart in some cases.
Lower abdominal pain follows a similar logic. Pain in the lower right is the classic location for appendicitis, though it can also come from irritable bowel syndrome (IBS), inflammatory bowel disease, or gynecological conditions like ovarian cysts. Lower left pain is the most common spot for diverticulitis, a condition where small pouches in the colon wall become inflamed. Pain that’s hard to pin down to one spot, or that moves around, is more typical of gas, bloating, or a stomach bug working its way through your system.
The Most Common Culprits
For most people searching this question, the answer falls into one of a handful of categories: something you ate, a mild infection, too much stomach acid, or stress.
Gas and bloating are the single most frequent cause of temporary stomach pain. When your gut bacteria ferment certain carbohydrates that your small intestine didn’t fully absorb, they produce gas that stretches the intestinal wall. Foods high in poorly absorbed sugars are the usual triggers: garlic, onions, wheat, beans, dairy (if you’re lactose intolerant), apples, and artificial sweeteners. The pain tends to feel like pressure or cramping that shifts around and improves after passing gas or having a bowel movement.
Acid-related pain feels different. Gastritis (inflammation of the stomach lining) and peptic ulcers both produce a dull or burning sensation in the upper middle abdomen. With ulcers, the pain often worsens between meals or at night when there’s no food to buffer the acid, though some people feel worse right after eating. Bloating, nausea, belching, and heartburn are common companions. Ulcers form when the protective mucus layer of the stomach or upper intestine breaks down, letting acid eat into the tissue underneath. A bacterial infection called H. pylori is one of the main causes, and it’s treatable with a short course of antibiotics.
Pain Medications That Cause Stomach Pain
This one catches a lot of people off guard. Ibuprofen, aspirin, and other common over-the-counter pain relievers (NSAIDs) are a leading cause of stomach pain, especially with regular use. These drugs damage the stomach lining through two routes at once. On contact, they strip away the protective fatty layer that keeps acid from reaching vulnerable tissue. Simultaneously, they block enzymes that maintain blood flow to the stomach wall and help produce protective mucus. The result is erosion, irritation, and sometimes full ulcers. If your stomach consistently hurts and you take ibuprofen or aspirin regularly, that connection is worth investigating.
Food Poisoning and Stomach Bugs
If your stomach pain came on suddenly and is accompanied by nausea, vomiting, or diarrhea, a foodborne illness or viral infection is a strong possibility. The timeline helps identify what you’re dealing with. Norovirus (the most common stomach bug) hits fast, typically 12 to 48 hours after exposure. Salmonella shows up within 6 to 48 hours. E. coli infections take longer, usually one to three days, with some strains taking up to eight days to cause symptoms.
Most food poisoning runs its course in one to three days. The pain is usually crampy and comes in waves, often concentrated around your navel or lower abdomen. Staying hydrated is the main priority since vomiting and diarrhea drain fluids quickly.
When Pain Keeps Coming Back
Stomach pain that recurs over weeks or months suggests something chronic rather than a one-time trigger. IBS is one of the most common explanations. It’s defined by recurring abdominal pain at least one day per week for three months, linked to changes in how often you go to the bathroom or what your stool looks like. Symptoms need to have started at least six months before diagnosis. IBS doesn’t cause visible damage to the gut, but the pain is real. People with IBS have heightened nerve sensitivity in their intestines, meaning normal amounts of gas or stretching trigger pain signals that wouldn’t register for someone else.
This heightened sensitivity, sometimes called visceral hypersensitivity, explains why some people experience genuine pain even when scans and tests look completely normal. Specialized cells in the gut lining detect changes in the intestinal environment and relay amplified signals through the gut’s own nervous system. The threshold for what registers as painful drops, so ordinary digestion can feel uncomfortable or even sharp.
Functional dyspepsia is another chronic condition worth knowing about. It causes persistent pain or discomfort in the upper stomach without an obvious structural cause like an ulcer. Testing for H. pylori infection is a standard first step, since treating the bacteria resolves symptoms for some people. When that’s not the issue, acid-reducing medication is typically effective. Regular aerobic exercise has also shown benefit, though the evidence behind that recommendation is still limited.
Stress and Your Gut
The brain and gut communicate constantly through a dense network of nerves. Stress, anxiety, and lack of sleep can directly increase stomach acid production, speed up or slow down digestion, and lower the pain threshold in your intestines. If your stomach tends to hurt during high-pressure periods at work, before exams, or during emotionally difficult stretches, the connection is probably not coincidental. This doesn’t mean the pain is imaginary. It means your nervous system is physically altering how your gut functions.
Signs That Need Prompt Attention
Most stomach pain is benign, but certain features signal something more serious. A rigid or distended abdomen that’s extremely tender to touch can indicate a perforation or severe infection. Vomiting blood (which can look red or like dark coffee grounds) or black, tarry stools point to bleeding somewhere in the digestive tract. Severe pain that came on suddenly, especially with fainting or lightheadedness, needs immediate evaluation. Fever combined with worsening abdominal pain also raises the urgency, particularly if the pain is localized to one specific area rather than spread across your whole belly.
For women of reproductive age, sudden lower abdominal pain with missed periods or unusual bleeding could signal an ectopic pregnancy, which requires emergency care. And pain in the lower right abdomen that started near the navel and migrated over several hours is the textbook pattern for appendicitis.
Narrowing Down Your Cause
A few questions can help you sort through the possibilities. When does the pain happen relative to eating? Pain that improves with food suggests excess acid hitting an empty stomach. Pain that worsens after meals points toward gallbladder issues, food intolerances, or functional dyspepsia. Is the pain sharp and localized, or dull and spread out? Sharp, fixed pain is more concerning for structural problems. Diffuse cramping is more typical of gas, infections, or IBS.
How long has it been going on? Pain lasting hours to a couple of days is usually acute: an infection, something you ate, or a medication side effect. Pain recurring over weeks likely involves a chronic condition that benefits from a proper workup. Pay attention to what makes it better or worse. If antacids help, acid is probably involved. If passing gas or having a bowel movement brings relief, the issue is more likely in the intestines than the stomach itself.