The carbon 14 breath test requires more than 2 hours of fasting and some hospitals require an appointment. It is mainly used to check whether the body is infected with H. pylori, and patients suffering from chronic gastritis and gastric ulcer are prone to H. pylori infection in the body. In the treatment need to kill H. pylori, most of them are anti-inflammatory drugs, so it is necessary to make an accurate test before using the drugs. In case of co-infection, drugs such as amoxicillin and clarithromycin can be taken orally to eradicate H. pylori, and the course of treatment takes two weeks. H. pylori is mainly transmitted through saliva, etc., so communal chopsticks are promoted when sharing meals.