Stomach Ulcer Diet: What to Eat and What to Avoid

Why does diet matter when you have a stomach ulcer?

A peptic ulcer is a sore in the lining of the stomach or duodenum. The two most common causes are infection with Helicobacter pylori (H. pylori) and regular use of NSAIDs such as aspirin, ibuprofen, or naproxen. Treatment targets the underlying cause: antibiotics plus acid suppression for H. pylori, stopping the offending NSAID, and proton pump inhibitors to reduce acid and allow the mucosa to heal 1Ref 1Chey WD, Howden CW, Moss SF, Morgan DR, Greer KB, Grover S, Shah SC (2024).ACG Clinical Guideline: Treatment of Helicobacter pylori Infection.H. pylori as primary cause of peptic ulcers; antibiotic plus acid suppression as the treatment foundation; probiotic role alongside H. pylori therapy; diet as supportive, not curative..

Diet does not cause or cure ulcers, but what you eat influences gastric acid output, the speed at which the stomach empties, and how irritated the ulcer lining becomes. Thoughtful food choices during the weeks of active treatment can reduce discomfort and support the healing process.

Which foods tend to worsen ulcer symptoms?

These foods commonly increase acid production or directly irritate the ulcer lining 2Ref 2National Institute of Diabetes and Digestive and Kidney Diseases (2022).Peptic Ulcers (Stomach or Duodenal Ulcers).Overview of peptic ulcer causes (H. pylori and NSAIDs); guidance on NSAID avoidance and need for medical evaluation; general patient education on ulcer management.:

Highly acidic foods: Citrus fruits and juices, tomatoes and tomato-based sauces, and vinegar-heavy dressings can aggravate symptoms in people with active ulcers.

Spicy foods: Hot sauces and heavy spicing can irritate an inflamed gastric lining, though individual tolerance varies significantly.

Coffee and caffeine: Both caffeinated and decaffeinated coffee stimulate acid secretion and can worsen ulcer pain. Tea, cola, and energy drinks also contain caffeine.

Alcohol: Alcohol irritates the gastric mucosa directly, stimulates acid production, can delay mucosal healing, and may interact with ulcer medications.

Fatty and fried foods: High-fat meals slow gastric emptying, keeping acid in contact with the ulcer for longer.

Carbonated beverages: Gas can cause gastric distension and worsen upper abdominal discomfort.

Not everyone with a peptic ulcer reacts identically to these foods. Keeping a brief food-symptom diary is more useful than rigidly following a universal list.

Which foods are gentler on a healing ulcer?

No food has proven ulcer-healing properties on its own, but several categories tend to be better tolerated during active disease:

Lean proteins: Chicken, turkey, fish, and eggs are generally well tolerated and do not strongly stimulate acid.

Cooked vegetables: Steamed or roasted vegetables (avoiding tomatoes and peppers for some people) are easier on the stomach than raw high-fiber vegetables.

Whole grains and complex carbohydrates: Oatmeal, plain rice, and similar foods may buffer stomach acid and reduce irritation.

Low-acid fruits: Bananas and melons tend to be better tolerated than citrus.

Probiotic-containing foods: Yogurt with live cultures and fermented foods may help buffer the gastric environment and support the gut microbiome alongside H. pylori treatment, though they are not a substitute for prescribed antibiotics 1Ref 1Chey WD, Howden CW, Moss SF, Morgan DR, Greer KB, Grover S, Shah SC (2024).ACG Clinical Guideline: Treatment of Helicobacter pylori Infection.H. pylori as primary cause of peptic ulcers; antibiotic plus acid suppression as the treatment foundation; probiotic role alongside H. pylori therapy; diet as supportive, not curative..

Small, frequent meals: Eating smaller portions more often can buffer stomach acid more continuously than three large meals.

What about milk — does it help?

A common belief is that milk soothes ulcer pain, and in the short term it may provide temporary relief due to its buffering effect on acid. However, milk also stimulates acid secretion in the hour or two that follows, which can make symptoms return or worsen. Most gastroenterologists do not recommend using milk as a primary strategy for managing ulcer discomfort 2Ref 2National Institute of Diabetes and Digestive and Kidney Diseases (2022).Peptic Ulcers (Stomach or Duodenal Ulcers).Overview of peptic ulcer causes (H. pylori and NSAIDs); guidance on NSAID avoidance and need for medical evaluation; general patient education on ulcer management..

NSAIDs, aspirin, and supplements to be cautious with

During active ulcer treatment and healing:

• Avoid NSAIDs (ibuprofen, naproxen, aspirin in pain-relief doses) unless your clinician explicitly advises otherwise. Acetaminophen is generally the preferred alternative for pain during ulcer healing 2Ref 2National Institute of Diabetes and Digestive and Kidney Diseases (2022).Peptic Ulcers (Stomach or Duodenal Ulcers).Overview of peptic ulcer causes (H. pylori and NSAIDs); guidance on NSAID avoidance and need for medical evaluation; general patient education on ulcer management..
• Limit or avoid alcohol — it directly damages the gastric mucosa and impairs healing.
• Be cautious with high-dose vitamin C supplements and other acidic supplements.
• Iron supplements can irritate the gastric lining and may be temporarily deferred unless medically necessary — discuss with your clinician.

If aspirin is prescribed at low dose for cardiovascular protection, do not stop it without speaking to your prescribing clinician first.

When should I follow up with a clinician about my ulcer diet?

Diet is a supportive part of ulcer care, not the primary treatment. If you have a confirmed peptic ulcer — or symptoms strongly suggesting one — a Gale primary care clinician can review your treatment plan, confirm that H. pylori testing has been done, ensure you are on appropriate acid-suppressing medication, and discuss dietary strategies suited to your situation. If your symptoms are not improving with standard treatment, a gastroenterologist referral is appropriate for endoscopic evaluation.