H. pylori infection can cause a number of gastrointestinal problems in both adults and children. For example, gastritis, enteritis and so on. Therefore, it is very necessary to eliminate and prevent H. pylori infection, and for the examination of H. pylori, we can be divided into the following types: endoscopy: endoscopy can clearly see the inside of our intestines and stomach, for H. pylori infection caused by gastric ulcers and other diseases, through endoscopy, can be very directly detected, in addition, endoscopy can also be directly removed from the affected area of the section, can help doctors directly test the degree of infection and infection flora. In addition, the endoscopy can also remove the section directly from the affected area, which can help the doctor to directly test the extent of the infection and the infected flora. However, endoscopy has its drawbacks, as the endoscope has to penetrate directly into the patient’s body, so it can cause discomfort to a large extent. Blood tests: H. pylori serum antibodies appear in the blood of people with H. pylori infection, so we can also determine this through blood tests, but blood tests have certain limitations, even if the H. pylori infection has been eradicated, the antibodies in the blood can still persist for a considerable period of time. Moreover, there are many factors affecting the blood, so false positive results can occur and there is a certain degree of inaccuracy. Breath test: The current medical development has improved, the examination of H. pylori is becoming more and more convenient, breath test is a very good way to test, its principle of action is to determine the presence of H. pylori by the exhaled gas, carrying the flora. If there is a recent application of antibiotics, bismuth, proton pump inhibitors and other drugs, the activity of H. pylori is lower and prone to false negatives. Finally, there are various methods of H. pylori screening, each with its advantages and disadvantages, and we can choose according to our needs when choosing.