There are many different types of cancer, and different parts of cancer may show different signs in early stage. 1. Like esophageal cancer, it may mainly show choking discomfort when eating dry and hard food, but not when eating soft food, noodles or rice. Once there is choking discomfort when eating dry and hard food, it is necessary to consider the possibility of esophageal malignant tumor. If the patient’s age is above 45 years old, he needs to do gastroscopy as soon as possible and cannot delay for too long. 2. like malignant tumor of lung, early stage may have dry cough, long-lasting cough and blood in sputum, he must do CT examination of lung, other chest X-ray and fluoroscopy cannot replace CT of lung. 3. like early stage malignant tumor, many of them have no obvious signal, only to do regular health checkups and find and treat the problem early. It can only be found and treated early, not by observing some danger signals and then going for examination, which may be too late.