H. pylori: when the bacteria are gone and the stomach pain stays.

Antibiotics cleared the infection and the ulcer healed. So why does your stomach still hurt? Often the answer is the nervous system.

This page is about understanding the condition and the role the brain and nervous system can play in it. It is not a diagnosis. Your own clinicians know your case.

What H. pylori is

Helicobacter pylori is a spiral-shaped bacterium that lives in the mucus layer of the stomach. Roughly half the world's population carries it, usually acquired in childhood, and most carriers never have symptoms. In some people it causes chronic inflammation of the stomach lining (gastritis), peptic ulcers in the stomach or the first part of the small intestine (the duodenum), and over many years it raises the risk of stomach cancer.

Symptoms, when present, include gnawing or burning upper abdominal pain, bloating, nausea, early fullness and, with an ulcer, pain that changes with eating. Diagnosis is by urea breath test, stool antigen test or biopsy during endoscopy. Treatment is a one- to two-week course of two or more antibiotics with a proton-pump inhibitor, followed by a test to confirm the bacteria are gone. This is a real infection with a real treatment, and the treatment works for the great majority of people.

The neuroplastic contribution

The ATNS Index of Neuroplastic Symptoms is clear that H. pylori infection is not itself related to neuroplastic symptoms. Its point concerns what happens afterward: if symptoms continue once the bacteria have been eradicated and any ulcer has healed, then an evaluation for neuroplastic symptoms should be done.

Neuroplastic symptoms are real physical symptoms produced by learned patterns in the brain and nervous system, a sensitized alarm, rather than by ongoing injury or disease in the organ. They are not imaginary and not a sign that you are anxious by nature. The stomach is a common site for them because it has a dense nerve supply in constant conversation with the brain, and because a period of genuine inflammation or ulcer pain teaches the nervous system to pay close, worried attention to that area. When the infection is gone, the attention can remain, and attention plus fear is enough to keep producing pain, nausea and fullness. Gastroenterologists call this functional dyspepsia, a disorder of gut-brain interaction. Our page on central sensitization explains the same process in pain generally.

Things that make a neuroplastic contribution more likely after H. pylori:

• A confirmed negative test after treatment, with symptoms carrying on regardless.
• A normal repeat endoscopy or no new findings.
• Symptoms that spread, change character or come with bloating, bowel changes or fatigue.
• Worry about the stomach, reinfection or cancer that occupies a lot of your attention.

What the research shows

A meta-analysis of randomised trials of H. pylori eradication for functional dyspepsia (dyspepsia with no ulcer) found that eradication produced a modest but statistically significant improvement in symptoms, with a number needed to treat of about 15, and in studies from Asia the effect was not significant at all. In other words, clearing the bacteria helps a minority of people with these symptoms; for most, the symptoms have another driver.

A Chinese study of persistent functional dyspepsia after H. pylori eradication reported that severe dyspeptic symptoms continued in roughly 30 percent of treated patients and noted that insufficient symptom resolution after eradication is undoubtedly observed in clinical practice. The authors investigated inflammatory pathways; whatever the biology, the clinical fact is that a large group of people are left with symptoms after a successful cure.

Earlier work, including a cohort study of eradication in people with functional dyspepsia symptoms and a review of H. pylori's role in functional dyspepsia, reached similar conclusions: eradication is worthwhile, the symptom benefit is partial, and persistent symptoms need a different explanation. None of these studies tested a neuroplastic-symptom approach directly, so that part of the case rests on the broader literature on disorders of gut-brain interaction, where the nervous system is well established as the main driver.

Signs the brain may be part of the picture

• Your post-treatment test confirmed the bacteria are gone, but the pain, burning or nausea continue.
• Repeat endoscopy is normal or shows only mild, healed changes.
• Symptoms vary with stress, sleep and worry more than with food.
• You find yourself monitoring your stomach, researching reinfection or fearing a missed diagnosis.
• You also have IBS-type symptoms, headaches, pelvic pain or other stress-sensitive conditions.
• Acid suppression helps only partly or not at all.
• The original infection coincided with a stressful period and the stress is still present.

A solution that addresses it

There is an approach that addresses the brain's contribution. Pain and symptom reprocessing combines education about neuroplastic symptoms, somatic tracking (observing stomach sensations with calm curiosity instead of alarm), reducing fear and threat, a graded return to normal eating and activity, emotional awareness and expression, and acceptance and commitment skills. It is delivered by trained clinicians, including gut-directed psychologists, and increasingly through digital programmes.

Cindra is a daily AI companion built around these approaches, with daily check-ins, short practices and plain-language lessons for people whose symptoms have a neuroplastic component. If your stomach has stayed sore after a successful cure, you can join the waitlist.

What to do next

Finish the medical job first. Complete the full antibiotic course, have the confirmation test at least four weeks after finishing, and follow your doctor's advice on repeat endoscopy if you had an ulcer. Seek prompt care for black or bloody stools, vomiting blood, difficulty swallowing, unexplained weight loss, persistent vomiting, or severe sudden abdominal pain.

Then ask the next question. If the infection is cleared and the stomach has healed but symptoms persist, ask your gastroenterologist whether this is functional dyspepsia and whether a neuroplastic, gut-brain approach fits.

Then start retraining. Reintroduce foods gradually, stop the daily symptom-checking, and work through mindfulness and somatic practices. See the related entries for functional dyspepsia and gastritis in the condition index.

This article is for general education and is not medical advice, and it does not diagnose or treat any condition. Persistent symptoms deserve a proper medical assessment to rule out disease or injury before a neuroplastic explanation is considered. If your symptoms are new, changing, or come with red-flag signs such as fever, unexplained weight loss, numbness or weakness, chest pain, or loss of bladder or bowel control, see a clinician promptly.