The signals conveyed in the early stage of esophageal cancer are not stomach discomfort. Esophageal cancer is a malignant tumor originated from columnar epithelium and squamous epithelium of the esophagus, and the most typical clinical symptom caused by the disease is progressive development of worsening dysphagia. For patients with esophageal cancer, there are generally no obvious signs and symptoms in the early stage of the disease, but it cannot be ruled out that some patients’ bodies will pass out some signals in the early stage of the disease, but such signals are generally not stomach discomfort, because the primary lesion of esophageal cancer is not located in the stomach. According to “Practical Internal Medicine”, in the early stage of the disease, patients with esophageal cancer will have symptoms of abnormal peristalsis or spasm of esophagus due to the stimulation of esophagus caused by the local lesion, which is mainly manifested as post-sternal discomfort, pain or burning sensation, and when food passes through the esophagus locally, friction sensation or foreign body sensation will be produced, and the patients may have a mild sense of obstruction when swallowing food. All in all, the symptoms caused by esophageal cancer in early stage are generally not obvious. Therefore, it is recommended to have regular medical checkups and seek medical treatment in case of discomfort without delay, so as to avoid delay in treatment.