The complexity of the human body determines the diversity of diseases. However, many different diseases have the same or similar clinical symptoms, and the careful screening of these symptoms can provide clues for further treatment. As industrialization and environmental pollution intensify, the incidence of malignant tumors in China is increasing year by year. If malignant tumors can be detected early, diagnosed early and treated early, the clinical effect of malignant tumors can be significantly improved. If malignant tumors can be detected early, diagnosed early and treated early, the clinical effect of malignant tumors can be significantly improved, including the preservation of organs and recovery of functions. After the occurrence of malignant tumor, based on its own characteristics, there are some special clinical manifestations (signals) that need to be noted, which are briefly listed as follows: 1. If there is a feeling of obstruction or foreign body in swallowing for unknown reasons, it should be alerted to hypopharyngeal cancer or esophageal cancer; 7. It does not mean that you have cancer if you have the above symptoms, but it is undoubtedly necessary to seek medical treatment and timely examination before the nature of the disease is clarified.