Helicobacter pylori (H. pylori) Infection: Symptoms & Signs

Medically Reviewed on 9/10/2019

Helicobacter pylori (H. pylori) infects the cells of the stomach lining, causing production of a toxin and subsequent inflammation that can lead to a variety of symptoms and signs. The clinical picture is very variable in that some people who are infected do not have any symptoms. Others may have mild symptoms, while others develop severe symptoms and ulcers.

Mild symptoms of H. pylori infection are

In more severe cases, those affected by H. pylori may experience

Causes of Helicobacter pylori (H. pylori) infection

H. pylori is a type of bacteria that can invade the lining of the stomach, causing an infection. The inflammation results from production of a toxin known as vacuolating cytotoxin A (Vac-A). The inflammation can lead to ulcer formation.

Other helicobacter pylori (h. pylori) symptoms and signs


Pancreatitis is inflammation of an organ in the abdomen called the pancreas. See Answer

Subscribe to MedicineNet's General Health Newsletter

By clicking Submit, I agree to the MedicineNet's Terms & Conditions & Privacy Policy and understand that I may opt out of MedicineNet's subscriptions at any time.

Kasper, D.L., et al., eds. Harrison's Principles of Internal Medicine, 19th Ed. United States: McGraw-Hill Education, 2015.