Can Helicobacter pylori infection cause stomach cancer?

The infection is a risk factor rather than a diagnosis of cancer, and many people who carry the bacteria never develop a malignancy.

Helicobacter pylori can settle beneath the stomach's protective mucus layer and maintain inflammation for years. Ongoing injury may lead to loss of normal gland cells and then abnormal cell changes. In a smaller group of people, that sequence can progress to gastric adenocarcinoma.

Infection can also be associated with gastric MALT lymphoma, which begins in immune cells and is different from adenocarcinoma. Determining the type of any abnormality requires endoscopy and a biopsy, not symptoms alone.

If a test confirms active Helicobacter pylori infection, take the full prescribed combination of antibiotics and acid-suppressing medicine. Completing every medicine as directed improves the chance of clearing the bacteria and helps limit further injury to the stomach lining.

Your clinician may arrange a breath or stool test after treatment to confirm eradication. The timing matters because certain acid-suppressing medicines and antibiotics can affect test results, so follow the preparation instructions supplied by the clinic.

Seek a timely appointment for persistent upper-abdominal discomfort, reduced appetite, feeling full unusually quickly, repeated vomiting, trouble swallowing, unexplained weight loss, or increasing tiredness. Get urgent care if you vomit blood, pass black tar-like stool, faint, or develop severe abdominal pain.

Ask whether your result shows active infection, which treatment schedule fits your medical history, and when you should be retested. If symptoms continue after eradication, discuss whether endoscopy is needed and which warning signs should bring you back sooner.