Frequent vomiting by hand is not a cause of esophageal cancer, so frequent vomiting by hand will not directly lead to the occurrence of esophageal cancer. The etiology of esophageal cancer is not clear, mostly considered to be related to smoking, drinking and poor eating habits. However, if you often induce vomiting by hand, you will vomit out stomach acid together with food, and then stomach acid will regularly stimulate and corrode the mucosa of esophagus, causing damage and degeneration of esophageal cells, which may even lead to the occurrence of cancer. In addition, frequent vomiting by hand may relax the sphincter at the esophagus, causing frequent reflux when there is too much acid, which increases the risk of esophageal cancer. In some cases, it may also lead to damage to the throat, rupture of blood vessels in the fundus, cardiac arrhythmia, anorexia and shock, which may seriously endanger the life of patients. In addition, eating foods that are too hot, irritating, moldy, or lack of trace elements in the body or poor living conditions may increase the risk of esophageal cancer. Patients are advised to improve their bad habits and avoid inducing vomiting by hand as much as possible. Even though the mucosa of esophagus has the function of self-repair, frequent emetic will lead to abnormal mucosal tissue proliferation and tumor formation, which may also increase the incidence of gastric cancer. If patients experience gastric distension and discomfort after eating, they can adjust by regular diet and taking drugs that promote gastrointestinal motility, such as domperidone tablets and mosapride, under the guidance of doctors.