The breath test is used to detect the presence of HP infection in the human stomach, which is Helicobacter pylori, a bacterium that causes acute gastritis, chronic gastritis, peptic ulcer, and stomach cancer. The breath test is divided into carbon 13 breath test and carbon 14 breath test, both of which are non-invasive and require an empty stomach in the morning, or more than two hours after a meal if you have already eaten. If the breath test indicates the presence of HP infection in the stomach, it is recommended that the patient be treated with medication to eradicate H. pylori under the guidance of a specialist. Because HP infection may cause peptic ulcer or even stomach cancer in severe cases, so patients should pay attention to it.