Long-term belching can be cancerous, depending on what causes it. Belching, commonly known as belching, is one of the common symptoms of digestive disorders and is not the name of a disease. Belching can be caused by a variety of conditions, including reflux esophagitis, chronic gastritis, peptic ulcers and functional dyspepsia. Among them, reflux esophagitis is a precancerous lesion of esophageal cancer, and long-term untreated esophagitis can become cancerous and form esophageal cancer. Chronic atrophic gastritis among chronic gastritis is also a precancerous lesion and may become cancerous and form gastric cancer, while chronic superficial gastritis is generally not cancerous. Gastric ulcers, among peptic ulcers, have a 10% chance of becoming cancerous, while duodenal ulcers rarely become cancerous. Therefore, long-term belching should not be taken lightly, and it is important to go to the hospital in a timely manner to clarify the cause so as not to delay the treatment effect due to cancerous changes.