Helicobacter pylori can come back because it is contagious and common and can be re-infected by contact with someone who has the disease. Helicobacter pylori is a common causative agent of gastric diseases, such as chronic gastritis, peptic ulcer and other diseases and Helicobacter pylori has a close relationship. H. pylori is contagious, and in daily life, sharing utensils or kissing with someone who carries H. pylori can easily cause the spread of the bacteria. After eradicating H. pylori with quadruple drugs, some people are found to have H. pylori infection when they are retested, which may be the result of relapse due to contact infection with other people who have the disease after cure. If H. pylori recurs after being cured, you can contact your doctor to standardize treatment again.