The most telling sign of a peptic ulcer is a dull or burning pain in your upper abdomen, between your belly button and breastbone. This pain often comes and goes over days or weeks rather than hitting once and disappearing. But ulcers don’t always announce themselves with textbook symptoms, and some cause no pain at all, which makes them tricky to identify on your own.
The Most Common Ulcer Symptoms
Ulcer pain tends to sit in a specific spot: the upper middle part of your abdomen. It can feel like a dull ache, a gnawing sensation, or a burning that radiates through your midsection. For some people, the pain flares when the stomach is empty or in the middle of the night, then fades after eating. For others, eating actually makes it worse. That variability is part of what makes ulcers hard to pin down without testing.
Beyond the pain, ulcers commonly cause a cluster of digestive symptoms that overlap with general indigestion:
- Feeling full too quickly when eating, even small meals
- Uncomfortable fullness that lingers after eating
- Nausea or vomiting
- Bloating and belching
None of these symptoms alone confirms an ulcer. Plenty of other conditions cause upper abdominal discomfort. What sets ulcer pain apart is its persistence: it tends to cycle, improving for a few days and then returning, sometimes for weeks.
Ulcer Pain vs. Heartburn and Acid Reflux
Ulcers and acid reflux (GERD) are easy to confuse because both involve stomach acid and both cause burning sensations. The key difference is location and direction. GERD happens when acid escapes upward into your esophagus, causing heartburn behind your breastbone, regurgitation, difficulty swallowing, and sometimes bad breath. The problem is a weak valve between your esophagus and stomach.
An ulcer, by contrast, is an open sore in the lining of your stomach or the first part of your small intestine. The pain sits lower, in the abdomen rather than the chest, and doesn’t typically involve the throat-burning or regurgitation that GERD produces. Ulcers are also more likely to cause bleeding you’d notice in your stool. That said, it’s possible to have both conditions at the same time, which is one reason testing matters more than guessing.
What Causes Ulcers in the First Place
Two things cause the vast majority of peptic ulcers: a bacterial infection and painkillers.
The bacterium H. pylori burrows into the protective mucus lining of the stomach, weakening its defenses against acid. It disrupts the cells that regulate acid production, essentially telling the stomach to make more acid while simultaneously stripping away the barrier that protects against it. About half the world’s population carries H. pylori, but only a fraction develop ulcers. Why some people get ulcers and others don’t isn’t fully understood, but the infection is a necessary trigger in many cases.
The other major cause is regular use of NSAIDs, the category that includes ibuprofen, naproxen, and aspirin. These drugs block a chemical that helps maintain the stomach’s protective lining. Clinical data shows that 3% to 4.5% of people taking NSAIDs develop upper digestive tract problems, and the risk of a serious event is roughly two to six times higher than in people who don’t take them. Even occasional use can contribute if you’re already vulnerable, but daily or near-daily use is where the real risk sits.
How Ulcers Are Diagnosed
You can’t diagnose an ulcer from symptoms alone. Two straightforward, noninvasive tests can identify H. pylori, the most common underlying cause.
A urea breath test has you drink a solution and then breathe into a collection bag. If H. pylori is present, the bacteria break down the solution in a way that changes the composition of your breath. This test picks up the infection about 92% to 94% of the time. A stool antigen test looks for H. pylori proteins in a stool sample and catches about 83% of infections. Both tests are widely available and can be ordered by a primary care doctor.
One important detail: proton pump inhibitors (common acid-reducing medications) and antibiotics can interfere with both tests and produce false negatives. If you’re taking either, your doctor will likely ask you to stop them temporarily before testing.
If your symptoms include weight loss, difficulty swallowing, anemia, or bleeding, or if you’re over 45 with new digestive symptoms, doctors typically recommend an upper endoscopy. This involves a thin, flexible camera passed through your mouth to directly examine the stomach and upper intestine. It’s the most definitive way to see an ulcer, take a tissue sample, and rule out other conditions.
Warning Signs That Need Immediate Attention
Most ulcers are manageable, but some develop complications that require emergency care. A bleeding ulcer can cause black, tarry stools with a distinctly strong, unpleasant odor. This appearance comes from blood being partially digested as it moves through your intestinal tract. You might also vomit blood, which can look bright red if the bleeding is active or dark brown and grainy (often compared to coffee grounds) if it has slowed.
A perforated ulcer, where the sore erodes completely through the stomach or intestinal wall, causes sudden, severe abdominal pain that doesn’t let up. If you experience any combination of black stools, vomiting blood, dizziness, weakness, heart palpitations, or shortness of breath, these point to significant blood loss and warrant an emergency room visit.
What Treatment Looks Like
If H. pylori is the cause, treatment centers on eliminating the infection. Current guidelines from the American College of Gastroenterology recommend a 14-day course that combines an acid-suppressing medication with antibiotics and bismuth (the active ingredient in Pepto-Bismol). This combination clears the infection in most people. If the first round doesn’t work, alternative drug combinations are available.
If NSAIDs caused your ulcer, the first step is stopping the drug or switching to an alternative that’s easier on the stomach. Your doctor will typically prescribe an acid-reducing medication for several weeks to let the ulcer heal. Most uncomplicated ulcers close within four to eight weeks once the irritant is removed and acid is controlled.
After treatment, a follow-up breath or stool test can confirm the infection is gone. Reinfection rates are low in developed countries, and once the underlying cause is addressed, most ulcers don’t come back.
Tracking Your Symptoms Before a Visit
If you suspect an ulcer, keeping a brief record of your symptoms for a week or two gives your doctor useful information. Note when pain occurs relative to meals, whether it wakes you at night, and what makes it better or worse. Write down any NSAIDs you take, how often, and for how long. Mention any family history of H. pylori or ulcers. This kind of detail helps your doctor choose the right test quickly rather than working through a long process of elimination.