Most stomach ulcers trace back to one of two causes: infection with the bacterium H. pylori or regular use of painkillers like ibuprofen and aspirin. Preventing ulcers, then, is less about bland diets and stress management than most people assume, and more about addressing those two specific threats. The science here is more settled than in many areas of medicine, but a few common beliefs about ulcers are flatly wrong, and some lesser-known risk factors deserve attention.
The Two Main Causes, and Why They Matter for Prevention
Your stomach lining faces an aggressive environment every day. It sits in a bath of hydrochloric acid strong enough to dissolve metal, yet a healthy stomach resists that acid thanks to a mucus barrier, bicarbonate secretion, and good blood flow to the tissue. An ulcer forms when something breaks that defense faster than the body can repair it. In the vast majority of cases, that “something” is either an H. pylori infection or chronic use of nonsteroidal anti-inflammatory drugs (NSAIDs).
H. pylori damages the stomach lining through several mechanisms at once. The bacterium attaches to the cells lining the stomach, damages their tiny surface structures, and releases a toxin that punches holes in cells. It also produces enzymes that degrade the protective mucus layer and break down the phospholipid coating on the cell surface, which allows stomach acid to seep back into the tissue and cause further injury.1Gastroenterology. How Does Helicobacter pylori Cause Mucosal Damage? Direct Mechanisms The discovery that a bacterium caused most ulcers was revolutionary when it was confirmed in the 1980s and 1990s; before that, doctors blamed stress and spicy food almost exclusively.2PubMed. The history of the discovery of the Helicobacter pylori
NSAIDs, the other major culprit, work by blocking enzymes called cyclooxygenases. That is what makes them reduce pain and inflammation. But those same enzymes produce prostaglandins, which are critical for maintaining stomach defenses: mucus production, blood flow to the lining, and bicarbonate secretion. Block the prostaglandins and you leave the stomach vulnerable. With chronic NSAID use, ulcer development becomes a serious clinical concern.3PubMed. Prostaglandins, NSAIDs, and gastric mucosal protection: why doesn’t the stomach digest itself?
Dealing With H. pylori
Roughly half the world’s population carries H. pylori, though only a fraction develop ulcers. The infection usually takes hold in childhood and persists for life unless treated with antibiotics. If you have had a peptic ulcer, getting tested for H. pylori is one of the most important steps you can take, because successfully wiping out the infection dramatically reduces the chance of the ulcer coming back. Research going back decades has shown that once the bacterium is eradicated, ulcer recurrence should become rare.4PubMed. The treatment of Helicobacter pylori infection in the management of peptic ulcer disease
Testing is straightforward. A breath test, stool antigen test, or blood antibody test can identify infection. Treatment typically involves a combination of two antibiotics plus an acid-suppressing drug, taken for one to two weeks. Antibiotic resistance is a growing issue globally, so if a first-line regimen fails, your doctor may switch to a different combination. The key preventive message is simple: if you have ulcer symptoms or a history of ulcers, ask about H. pylori testing. Treating the infection is far more effective at preventing recurrence than long-term acid suppression alone.
How to Protect Your Stomach if You Take NSAIDs
Millions of people rely on NSAIDs for arthritis, chronic pain, or cardiovascular protection (low-dose aspirin). If you are one of them, the ulcer risk is real but manageable. The most evidence-backed protective strategy is taking a proton pump inhibitor (PPI) alongside your NSAID. PPIs suppress gastric acid production and have proven effective at both healing NSAID-related ulcers and reducing the risk of new ones forming, even in people who continue taking NSAIDs.5PubMed Central. The use of proton pump inhibitors in treating and preventing NSAID-induced mucosal damage
For people at higher risk of ulcer complications, such as those with a history of ulcer bleeding, the evidence points to a layered approach. A selective COX-2 inhibitor (a type of NSAID designed to be easier on the stomach) combined with a PPI appears to offer the strongest gastrointestinal safety profile in high-risk patients.6PubMed Central. Prevention of NSAID‐induced gastroduodenal ulcers That said, COX-2 inhibitors carry their own concerns, particularly cardiovascular risks, so the decision involves trade-offs your doctor should walk through with you.
Some practical steps you can take on your own:
- Use the lowest effective dose: Take NSAIDs at the smallest dose that controls your symptoms, and for the shortest time possible.
- Avoid stacking painkillers: Taking ibuprofen and aspirin together, or adding a second NSAID, multiplies the risk.
- Consider alternatives: Acetaminophen (paracetamol) does not carry the same stomach risk, though it has its own limitations for inflammation.
- Talk to your doctor about a PPI: If you need daily NSAIDs for weeks or longer, co-prescribing a PPI is a well-supported strategy.
Smoking and Ulcer Risk
Cigarette smoking is one of the more underappreciated ulcer risk factors. Smokers are more likely to develop peptic ulcers, more likely to have them recur, and slower to heal once an ulcer forms.7PubMed. The role of smoking in peptic ulcer disease The mechanisms are extensive. Smoking reduces blood flow to the stomach lining, suppresses prostaglandin production (the same protective chemicals that NSAIDs block), slows the growth of new cells needed to repair damage, and interferes with the effectiveness of acid-suppressing medications like H2 blockers.8PubMed. Effects of cigarette smoking on gastric ulcer formation and healing: possible mechanisms of action
Nicotine specifically decreases mucus secretion and reduces levels of epidermal growth factor, a molecule involved in tissue repair.9Gastroenterology. Effects of smoking and nicotine on the gastric mucosa: A review of clinical and experimental evidence So smoking attacks stomach defenses from multiple angles at once: less mucus, less blood flow, less repair capacity, and weaker response to ulcer medications. If you smoke and are concerned about ulcers, quitting is one of the most effective preventive measures available, and it has the added benefit of improving how well ulcer treatments work if you do develop one.
The Alcohol Question
Heavy drinking damages the stomach lining. That is well established. Alcohol disrupts the mucosal barrier, and anyone who has had a rough morning after too many drinks has felt the gastric irritation firsthand. But the relationship between alcohol and actual peptic ulcer disease is surprisingly weak in the epidemiological data. A national survey examining the association found that alcohol consumption only minimally increased the odds of peptic ulcer, offering little support for a strong link between the two.10PubMed. An examination of the alcohol consumption and peptic ulcer association–results of a national survey
This does not mean alcohol is harmless to your stomach. It means that moderate drinking, for most people, is not a major independent driver of ulcer formation the way H. pylori infection or daily NSAID use is. Heavy and chronic alcohol use is a different story, as it can cause direct mucosal damage and compound the effects of other risk factors. The practical takeaway: cutting back on heavy drinking is wise for many health reasons, but moderate alcohol intake alone is unlikely to be the cause of an ulcer.
What About Stress?
The old belief that stress causes ulcers is half wrong and half right, and the distinction matters. Everyday psychological stress, like job pressure or relationship problems, has not been shown to cause peptic ulcers on its own. The discovery of H. pylori as the primary infectious cause essentially demolished the “stress ulcer” model that dominated medicine for decades.
But there is a separate and genuinely dangerous category called stress-related mucosal disease, which occurs in critically ill patients in intensive care. The physiological stress of severe burns, head injuries, major surgery, or sepsis can trigger ulceration and serious gastrointestinal bleeding. In ICU settings, suppressing acid production is a standard part of preventing these stress-related ulcers.11PubMed. Pathophysiology and prophylaxis of stress ulcer in intensive care unit patients Older research has also shown that chronic administration of stress hormones like cortisol can increase gastric acidity and pepsin levels enough to contribute to ulceration.12JAMA. Chronic Stress and Peptic Ulcer: I. Effect of Corticotropin (ACTH) and Cortisone on Gastric Secretion
So the picture is nuanced. If you are otherwise healthy, your daily stress is not going to give you an ulcer. But chronic psychological stress can affect your behavior, including smoking more, drinking more, reaching for NSAIDs for tension headaches, and eating poorly, all of which do raise ulcer risk indirectly. Managing stress is good for your stomach, but more because of what stress makes you do than because of what cortisol does to your stomach lining under normal conditions.
Diet and Fiber
For decades, doctors put ulcer patients on bland diets: milk, soft foods, nothing spicy. That approach has largely been abandoned because there is no strong evidence that bland food heals ulcers or prevents new ones. Spicy food can irritate an existing ulcer and make symptoms worse, but it does not appear to cause ulcers in a healthy stomach.
What does seem to help is a diet rich in fiber. Research has found that patients with peptic ulcers tend to eat less fiber and fewer antioxidant-rich foods. Fiber acts as a buffer in the digestive tract, helps regulate bile acid concentrations, and may reduce bloating and discomfort.13PubMed Central. Nutritional care in peptic ulcer Fruits, vegetables, whole grains, and legumes are all reasonable choices. Certain dietary components, including polyphenols (found in berries, tea, and dark chocolate), polysaccharides, and probiotics, have shown protective effects on the stomach lining in laboratory and some human studies.14PubMed. Exploring the Underlying Mechanisms of Preventive Treatment Related to Dietary Factors for Gastric Diseases
Probiotics deserve a specific mention. They do not appear to eradicate H. pylori on their own, but they may help reduce the bacterial load and, perhaps more usefully, reduce the side effects of antibiotic treatment when you are being treated for the infection.13PubMed Central. Nutritional care in peptic ulcer Yogurt, kefir, sauerkraut, and other fermented foods are easy ways to include these in your diet, though probiotic supplements offer higher doses.
Ulcers in Older Adults
Age brings compounding risk factors. Older adults are more likely to take daily NSAIDs or aspirin for arthritis and heart protection. They are more likely to have acquired H. pylori decades ago and never been treated. And their stomach lining may be less resilient to begin with. In one study of patients aged 80 and over who underwent endoscopy, peptic ulcers were found in about 17% of cases. Complications occurred in roughly 69% of those patients, and NSAID or aspirin users had complications more often than non-users.15PubMed. Peptic ulcer in the very old patients
Interestingly, the majority of ulcers in that very elderly group were H. pylori negative, suggesting that NSAID use was the dominant driver. This flips the pattern seen in younger adults, where H. pylori is more often the culprit. For older adults, the preventive priorities shift accordingly: careful review of whether each NSAID or aspirin is truly necessary, co-prescribing a PPI when NSAIDs cannot be stopped, and awareness that ulcer symptoms can be atypical in older people, sometimes presenting as vague nausea or unexplained anemia rather than classic burning pain.
Genetic Susceptibility
Not everyone exposed to H. pylori or NSAIDs develops ulcers, and part of the reason is genetic. Some people produce higher baseline levels of pepsinogen I, a precursor to the digestive enzyme pepsin. Elevated pepsinogen I has been associated with a subgroup of duodenal ulcer patients, and the trait runs in families.16PubMed. Genetic and evolutionary implications in peptic ulcer disease Blood type may also play a small role; type O has historically been linked to slightly higher ulcer rates, though the effect is modest.
You cannot change your genetics, but knowing your family history is useful. If a parent or sibling had peptic ulcers, you might want to be more cautious about chronic NSAID use and more proactive about H. pylori testing if symptoms arise.
Zinc-L-Carnosine and Other Supplements
Among supplements, zinc-L-carnosine (also known as polaprezinc) has the most interesting evidence base. It is actually approved as an anti-ulcer drug in Japan. The compound sticks to damaged areas of the stomach lining and stays there longer than either zinc or L-carnosine alone, which may explain its protective effect.17PubMed. Residence time of polaprezinc (zinc L-carnosine complex) in the rat stomach and adhesiveness to ulcerous sites Research supports its safety and potential for maintaining and protecting mucosal tissue in the upper gastrointestinal tract.18PubMed Central. A Review of Zinc-L-Carnosine and Its Positive Effects on Oral Mucositis, Taste Disorders, and Gastrointestinal Disorders
Other supplements sometimes mentioned for stomach health include deglycyrrhizinated licorice (DGL), mastic gum, and slippery elm. These have long histories in traditional medicine, but the clinical evidence for ulcer prevention in humans is thinner and less rigorous than for zinc-L-carnosine. None of these supplements should replace standard medical treatment for an active ulcer or a confirmed H. pylori infection. They are better understood as complementary measures, potentially useful for people trying to support stomach health alongside conventional care.
Warning Signs That Should Send You to a Doctor
Prevention is ideal, but recognizing when something has already gone wrong is equally important. The classic ulcer symptom is a burning or gnawing pain in the upper abdomen, often between meals or at night, that improves temporarily when you eat or take an antacid. But ulcers can also cause less obvious symptoms: unexplained nausea, feeling full quickly after small meals, or a subtle loss of appetite over weeks.
More urgent warning signs include vomiting blood (which can look bright red or like dark coffee grounds), black or tarry stools (a sign of bleeding in the digestive tract), sudden sharp abdominal pain that does not ease, and unintentional weight loss. Any of these warrant prompt medical evaluation, not watchful waiting. Bleeding ulcers can become life-threatening, and a perforated ulcer, where the erosion goes all the way through the stomach wall, is a surgical emergency.
If you are over 55, have alarm symptoms like bleeding or weight loss, or have a family history of stomach cancer, your doctor will likely recommend an endoscopy to directly visualize the ulcer and rule out anything more serious. Earlier diagnosis generally means simpler treatment and better outcomes, so the bias should always be toward getting checked sooner rather than later.