Blood tests for H. pylori usually detect serum antibodies and are only negative or positive. A negative test suggests no H. pylori infection, while a positive test suggests previous or current H. pylori infection and requires further refinement of the breath test. Clinically, H. pylori is not usually detected by blood tests, and reference standards for H. pylori based on blood tests are inconsistent. The most commonly used test for detecting H. pylori is the carbon 14 and carbon 13 breath test. When H. pylori infection occurs, it may induce gastritis, gastric ulcer and other diseases, and the patient will experience symptoms such as bad breath, bloating and discomfort, acid reflux, belching, etc. It is necessary to go to the hospital in time for medical consultation, and take regular medication for eradication of anti-H. pylori treatment. Diet to light, eat less spicy stimulation and other foods. Since H. pylori is highly contagious and can be transmitted through food, utensils, feces, etc., it is best to implement a meal sharing system in the family to avoid secondary infection.