Stomach Ulcers: Why Stress and Spicy Food Were Never the Real Cause
For most of the twentieth century, stomach ulcers were blamed on stress, personality and diet. Patients were given bland food, milk and sedatives. It turned out to be one of the largest sustained errors in modern medicine.
What an ulcer actually is
A peptic ulcer is a break in the lining of the stomach or the first part of the small intestine, the duodenum, deep enough to reach the layer beneath. The stomach lining normally protects itself from its own acid with mucus and bicarbonate. An ulcer forms when that defence is breached.
Two things breach it in the overwhelming majority of cases.
Helicobacter pylori. A spiral bacterium adapted to survive in stomach acid. It burrows into the mucus layer, triggers chronic inflammation and weakens the barrier. It is extremely common worldwide, often acquired in childhood, and most carriers never develop an ulcer. But among people who do have ulcers, it is the leading cause.
NSAIDs. Ibuprofen, diclofenac, naproxen, aspirin and the rest reduce prostaglandins, which the stomach needs to maintain its protective mucus. Regular use, especially at higher doses, in older adults, or combined with steroids, anticoagulants or SSRIs, substantially raises ulcer and bleeding risk.
Less common causes include rare acid-producing tumours, severe physical stress in intensive care, and certain other medicines.
So where do spicy food and stress fit? Chillies can aggravate the symptoms of an existing ulcer but do not cause one. Psychological stress may modestly influence acid and healing, but it is not the cause, and treating it as the cause is what delayed effective treatment for decades.
Symptoms
- Burning or gnawing pain in the upper abdomen, often between the navel and the breastbone
- Duodenal ulcers classically hurt when the stomach is empty and improve with food, often waking people at night
- Gastric ulcers often hurt soon after eating
- Bloating, early fullness, nausea
- Loss of appetite and weight loss
A significant minority, particularly older people on NSAIDs, have no pain at all and present only when the ulcer bleeds.
Warning signs that need urgent attention
- Vomiting blood, or material that looks like coffee grounds
- Black, tarry, foul-smelling stools
- Sudden severe abdominal pain with a rigid, board-like abdomen, which suggests perforation and is a surgical emergency
- Persistent vomiting with inability to keep food down
- Dizziness, fainting or rapid heartbeat, which suggest significant blood loss
- Unintended weight loss
- Difficulty swallowing
Testing for H. pylori
Three practical options.
Urea breath test. You drink a labelled urea solution; if the bacterium is present, its urease enzyme breaks it down and labelled carbon dioxide appears in your breath. Accurate for both diagnosis and confirming cure.
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Stool antigen test. Detects bacterial proteins in stool. Also accurate for diagnosis and cure confirmation.
Endoscopy with biopsy. Needed when alarm features are present, when the person is older at first presentation, or where gastric cancer risk is a concern.
Blood antibody tests are poor for this purpose. Antibodies persist for years after successful treatment, so a positive result cannot distinguish current from past infection. They should not be used to confirm cure.
Critical practical point: proton pump inhibitors must be stopped for about two weeks, and antibiotics for about four weeks, before a breath or stool test, or the result can be falsely negative.
Treatment
Eradication of H. pylori uses a combination of two or three antibiotics plus a proton pump inhibitor for 10 to 14 days. The exact combination depends on local resistance patterns, particularly to clarithromycin, which has risen substantially in many regions. Quadruple therapy including bismuth is increasingly used first-line.
Completing the full course matters more than usual here, because partial treatment drives resistance and makes the second attempt harder.
Confirm cure. This step is skipped constantly. Four weeks after finishing treatment, and off PPIs for two weeks, a breath or stool test should confirm eradication. A meaningful proportion of first-line courses fail, and the person has no way of knowing without testing.
If NSAIDs are the cause, stop them if possible. Where they must continue, a PPI is given alongside, and switching to a lower-risk option is considered.
PPIs heal the ulcer itself, typically over four to eight weeks.
Why eradication matters beyond the ulcer
H. pylori is classified as a group 1 carcinogen. Chronic infection is the strongest known risk factor for gastric cancer, which remains a leading cause of cancer death globally and is often diagnosed late.
Eradicating the infection reduces that risk, and the benefit is greater the earlier it is done, before chronic inflammation has caused atrophic changes in the stomach lining. In some high-incidence countries, family members of gastric cancer patients are screened and treated for this reason.
This is why “the ulcer healed, so treatment worked” is not the end of the matter. The ulcer is the symptom; the infection is the condition.
Diet, in proportion
No diet heals an ulcer, and no diet causes one. What diet can do is reduce symptoms while healing happens.
- Avoid the foods that reliably hurt you; there is no universal list
- Alcohol irritates the lining and is worth stopping during treatment
- Stop smoking, which impairs healing and raises recurrence
- Smaller, more frequent meals help some people
- The old milk advice is counterproductive: milk briefly buffers acid, then stimulates more
Recurrence
After successful eradication and with NSAIDs avoided, recurrence is uncommon. When an ulcer does recur, the usual explanations are failed eradication that was never confirmed, continued NSAID use including low-dose aspirin, smoking, or rarely a different underlying cause.
The short version
Ulcers are caused by a bacterium or by painkillers, not by worry or chillies. Get tested properly, complete the full eradication course, and then confirm the infection has actually gone four weeks later. That confirmation step is the one most people never have, and it is the one that protects against both recurrence and gastric cancer.