The breath test is a clinical method used in medicine to detect H. pylori, and once the test result is positive, it means that the patient is likely to be infected with H. pylori. Because it is contagious, it is easy to get infected if you are in close contact with an infected person for a long time and use unclean dishes used by an infected person. Clinically, H. pylori infection mainly manifests as stomach pain, bad breath, indigestion, etc. Some patients may experience upper abdominal discomfort and vague pain, which may lead to gastric mucosal damage in severe cases. Patients may experience recurrent abdominal pain, acid reflux and fullness, which may gradually cause gastritis, gastric ulcer, duodenal ulcer and other diseases, and a small number of patients may eventually lead to gastric cancer. Therefore, it is important to eradicate H. pylori. Patients can undergo standardized treatment under the guidance of a doctor, such as using a combination of antibiotics plus bismuth, adding proton pump inhibitors such as omeprazole and lansoprazole as needed, or they can choose two antibiotics plus proton pump inhibitors and then bismuth at the same time. If necessary, antibiotics can be selected based on antibiotic drug sensitivity tests to reduce the occurrence of drug resistance. In eradication treatment, it is important for patients to take the medication regularly as prescribed by the doctor, and even if the stomach symptoms improve, they need to adhere to the medication until H. pylori is eradicated to avoid the emergence of drug-resistant strains of H. pylori. Regular follow-ups while taking the medication can be performed 1 month after the end of the medication to determine if the eradication is complete.