A negative H. pylori antibody indicates that the stomach is healthy and not infected by H. pylori. H. pylori is the only bacterium that can survive in the presence of stomach acid, and in the presence of H. pylori infection it can cause damage to the mucous membrane of the stomach, which not only triggers gastritis flare-ups, but is also a common factor in the development of peptic ulcers. Breathalyzer is the main test for H. pylori. The results of the breath test are judged as negative or positive, with a positive test indicating that the stomach is infected with H. pylori and a negative test indicating that it is not infected. For those who are not infected, they should stick to their dietary habits and avoid eating unclean food to avoid burdening the gastrointestinal system. Those who already have H. pylori infection should be treated promptly, and since H. pylori is drug-resistant, it should be treated with a combination of drugs.