There is no direct relationship between gastroscopy and the occurrence of esophageal cancer, please rest assured. If the patient has undergone gastroscopy six months ago and there is a clear mass in the esophagus or there is a high suspicion of esophageal cancer, and the patient does not cooperate with the doctor for further examination and treatment in time, it may turn into esophageal cancer after six months. If gastroscopy did not find any lesion in esophagus six months ago, esophageal cancer usually will not occur after six months. The clinical symptoms of esophageal cancer include progressive dysphagia, abdominal pain, nausea, vomiting, lethargy, poor circulation, anemia and other symptoms. It is suggested that patients should go to hospital for timely consultation when necessary and cooperate with doctors to give detailed examination for clear diagnosis.