Gastroesophageal reflux may become cancerous, mainly related to long-term damage to the local mucosa. Gastroesophageal reflux refers to the reflux of stomach contents into the esophagus area, and patients may experience uncomfortable symptoms such as burning sensation at the back of the sternum, foreign body sensation in the throat, nausea and vomiting, and difficulty in swallowing due to the stimulation of mucosa by stomach contents. When gastroesophageal reflux occurs for a long time and repeatedly, it will cause local mucous membrane erosion, ulceration and bleeding, which will increase the chance of turning into cancer and should be taken seriously. In addition to the increased risk of cancer, GERD patients are also prone to complications such as upper gastrointestinal bleeding and esophageal stenosis, which can be life-threatening if left untreated. Patients with clear GERD should actively cooperate with doctors to control the progression of the disease through medication and surgery. You should also pay attention to your diet and avoid spicy and irritating foods. Since GERD is prone to recurrence, patients need to see a doctor for regular checkups to monitor their health condition and to determine whether the localized condition is cancerous or not. Avoid lying down within two hours of eating, and elevate the head when sleeping.