6 Facts About H. Pylori That Explain Why Only Some Indians Get Ulcers

Prevalence studies in India consistently place H. pylori infection rates between 50 and 70 percent of the adult population, with some community surveys in dense urban areas running higher. The Indian Council of Medical Research has noted that transmission happens early, usually before age ten, through contaminated water and close household contact. Carrying the bacterium is the norm, not the exception. An infection alone does not mean an ulcer is coming.

H. pylori is not one organism behaving the same way everywhere. Strains carrying a gene called cagA produce a protein that injects itself into stomach lining cells, triggering inflammation at a level that strains without the gene do not reach. Indian isolates show a high prevalence of cagA-positive strains, which partly explains why peptic ulcer disease rates here are not trivial despite the fact that most carriers never develop one. Whether a person's particular strain carries cagA is something only a laboratory can determine, not a symptom list.

Two people can carry an identical cagA-positive strain and arrive at completely different outcomes. The difference is largely in how the immune system responds to the initial infection. A response that clears inflammation efficiently tends to contain the damage to the stomach's outer mucus layer. A response that over-recruits inflammatory cells, particularly in people with certain genetic variants in cytokine pathways, keeps the lining under sustained attack. The bacterium provides the trigger; the immune system determines the trajectory. This is why ulcer risk runs in families even when diet and hygiene are similar.

H. pylori survives by suppressing acid in the part of the stomach it colonises while the rest of the stomach compensates by producing more. In people whose physiology pushes toward high baseline acid output, that compensation tips into the range where the duodenal lining becomes vulnerable. Diets high in salt have been shown to upregulate certain bacterial virulence factors, and the Indian Council of Medical Research has flagged high dietary salt as a co-factor in gastric mucosal damage. Spicy food, despite its reputation, is not the primary driver; the evidence for chilli as a direct cause of ulcers is weak. Salt and smoking are better-established co-factors than any single spice.

A significant proportion of peptic ulcers in India have nothing to do with H. pylori at all, or have H. pylori as a background condition while NSAIDs do the active damage. Drugs like ibuprofen and diclofenac, both widely available over the counter in India, suppress prostaglandins that maintain the stomach's protective mucus layer. Someone who carries H. pylori and takes NSAIDs regularly is not facing one risk factor but two working through different mechanisms on the same tissue. A gastroenterologist evaluating an ulcer patient will ask about NSAID use before concluding the bacterium is solely responsible.

Standard H. pylori eradication in India uses a triple-therapy regimen: a proton pump inhibitor with two antibiotics, typically clarithromycin and amoxicillin, for fourteen days. Eradication rates with this regimen have been falling in India as clarithromycin resistance rises, a pattern documented in gastroenterology literature from multiple Indian centres. A person who completes the course and tests negative has genuinely reduced their ulcer risk, but the regimen needs to have actually worked, which requires a confirmatory breath test or stool antigen test after treatment, not an assumption. Anyone who has had an ulcer and completed eradication therapy should ask their doctor whether a follow-up test was done, because a failed course leaves the underlying risk intact.