A burning sensation in your stomach is almost always caused by acid irritating tissue that isn’t fully protected. Under normal conditions, your stomach lining produces a thick layer of mucus that shields it from the highly acidic digestive juices inside. When that barrier breaks down, or when acid ends up somewhere it doesn’t belong (like your esophagus), you feel the burn. The specific reason your protective barrier failed is what separates a minor annoyance from something that needs treatment.
How Your Stomach’s Defenses Break Down
Your stomach produces hydrochloric acid strong enough to dissolve metal. The only reason it doesn’t dissolve your stomach itself is a mucus lining that acts as a chemical shield. This lining also relies on healthy blood flow to keep regenerating. When something reduces that blood flow or directly damages the mucus layer, raw stomach tissue gets exposed to acid. That contact triggers pain receptors, and you feel a burning or gnawing sensation between your belly button and breastbone.
This is the shared mechanism behind most causes of stomach burning. The difference between conditions comes down to what damaged the lining, where the damage is, and how deep it goes.
The Most Common Causes
Acid Reflux (GERD)
Acid reflux happens when the valve between your esophagus and stomach relaxes at the wrong time, allowing acid to wash upward. Your esophagus has no protective mucus layer, so even brief acid exposure causes a burning sensation in the chest and upper abdomen. Fatty, salty, or spicy foods are common triggers because they relax that valve and slow digestion, letting food sit in the stomach longer. Lying down or bending over after eating makes it worse because gravity stops working in your favor.
Occasional reflux is normal. When it happens regularly (twice a week or more), it’s classified as gastroesophageal reflux disease, or GERD. Over time, repeated acid exposure can damage the esophageal lining.
Gastritis
Gastritis is inflammation of the stomach lining itself. It can develop suddenly after a night of heavy drinking or build gradually over months. The burning tends to sit in the upper middle abdomen and may feel worse after eating. Reactive gastropathy, a related condition, develops when the stomach lining is exposed to irritating substances over a long period, such as alcohol or certain medications.
Peptic Ulcers
When the damage to your stomach or small intestine lining goes deep enough, it creates an open sore called a peptic ulcer. The pain is typically dull or burning and comes and goes over time. For some people, the burning is worst when the stomach is empty or at night, and eating briefly relieves it. For others, eating makes the pain worse. The location is the same general area: upper abdomen, between the belly button and breastbone.
H. Pylori Infection
More than half of all people worldwide carry the bacterium H. pylori at some point in their lives. Most never know it. But in some people, H. pylori damages the stomach’s protective lining, causing gastritis or ulcers. The bacterium can trigger burning and irritation even without creating a visible ulcer. It’s one of the most common underlying causes of stomach burning across all age groups, and it’s treatable with a course of antibiotics combined with acid-reducing medication.
Pain Medications
Over-the-counter pain relievers like ibuprofen, aspirin, and naproxen are a major cause of stomach burning, especially with regular use. These drugs work by blocking enzymes involved in inflammation, but those same enzymes help maintain blood flow to the stomach lining. Without adequate blood flow, the stomach’s protective mechanisms stop working normally, and acid reaches vulnerable tissue. This can lead to erosions, ulcers, and in serious cases, bleeding or perforation. The risk increases with dose and duration, and it’s particularly relevant for adults over 40 who use these medications frequently for chronic pain.
Functional Dyspepsia
Sometimes every test comes back normal and there’s still persistent burning. This is called functional dyspepsia, a condition where the stomach burns or hurts without any visible damage or structural abnormality. To qualify, symptoms need to be present for at least three months, with the pattern starting at least six months before diagnosis. The burning typically occurs at least one day per week and may come with early fullness during meals or a heavy feeling after eating. It’s thought to involve heightened nerve sensitivity in the digestive tract rather than actual tissue damage.
Food and Lifestyle Triggers
Certain foods don’t cause disease but can provoke burning in a stomach that’s already vulnerable. The most reliable triggers are foods high in fat, salt, or spice, particularly chili powder, black pepper, white pepper, and cayenne. These can relax the valve at the top of the stomach and slow digestion. Eating large meals close to bedtime is another reliable trigger, since lying down within two hours of eating makes reflux far more likely.
Stress also plays a role, particularly in younger adults. It doesn’t directly create ulcers the way people once believed, but it can increase acid production and alter digestion patterns enough to cause real burning symptoms.
How Burning Stomach Is Treated
Treatment depends entirely on the cause, which is why persistent symptoms are worth investigating rather than just managing with antacids.
For acid-related conditions, there are three main categories of medication. Antacids neutralize acid that’s already in the stomach and provide fast, short-term relief. H2 blockers (like famotidine, sold as Pepcid) reduce the amount of acid your stomach produces and last longer than antacids. Proton pump inhibitors, or PPIs (like omeprazole, sold as Prilosec), are the strongest acid reducers and are used for more persistent symptoms or confirmed GERD and ulcers.
If testing reveals an H. pylori infection, the standard approach is a combination of antibiotics and acid-reducing medication. This typically clears the infection and allows the stomach lining to heal. For people whose burning is caused by pain medications, the fix may be as straightforward as switching to a different type of pain reliever or adding a stomach-protective medication.
Functional dyspepsia can be trickier. Low-dose acid reducers help some people. Others respond to medications that help the stomach empty more efficiently. Because nerve sensitivity plays a role, some patients benefit from approaches that target how the gut and brain communicate.
When Stomach Burning Might Be Something Else
One important thing to know: burning in the chest and upper abdomen can mimic heart-related pain. Even experienced doctors sometimes can’t tell the difference based on symptoms alone. Heartburn typically occurs after eating, responds to antacids, and may come with a sour taste or mild regurgitation. Heart-related pain more often involves pressure or tightness that spreads to the neck, jaw, or arms, along with shortness of breath, cold sweats, dizziness, or unusual fatigue.
That said, a heart attack can present as what feels like simple indigestion. If burning pain is sudden, severe, doesn’t ease within 30 minutes, or comes with any of those additional symptoms, treat it as an emergency.
Signs That Need Prompt Attention
Most stomach burning is manageable and not dangerous. But certain patterns signal something more serious. Vomiting blood or material that looks like coffee grounds, black or tarry stools, unintentional weight loss, severe pain that doesn’t let up, or continuous vomiting alongside abdominal pain all warrant immediate medical evaluation. These can indicate a bleeding ulcer, perforation, or other conditions that progress quickly without treatment.
The cause of stomach burning also shifts with age. In younger adults, H. pylori, reflux, diet, and stress are the most common culprits. In middle-aged adults, ulcers and medication side effects become more prominent. In adults over 60, the same conditions apply, but stomach cancer enters the list of possibilities that doctors screen for, particularly when symptoms are new or accompanied by weight loss.