The clinical symptoms of middle and late stage malignant tumors are more typical and not difficult to diagnose, but the treatment effect is not good; the treatment effect of early stage malignant tumors is better, but the symptoms are not obvious and not easy to diagnose. After studying the occurrence and development rules of malignant tumors, medical doctors have discovered some early signals of malignant tumors. People often do not pay attention to these early signals, and even if they occur, they do not know what these signals represent. Once the meaning of these early signals is understood, the early detection of malignant tumors will no longer be difficult. The World Health Organization has proposed eight signs of early malignant tumor, which can be used as reference for early diagnosis of malignant tumor. 1. Sudden discovery of painless lumps that increase significantly within a short period of time, mainly occurring in superficial and touchable parts of human body, such as breast, thyroid, skin, lymph nodes, oral cavity and testicles. People often use whether it is painful as a sign to judge the severity of the disease, and often do not go to the doctor because it is not painful, so that early treatment is delayed. 2.Signal of dysphagia or obstruction: Because the tumor grows to block the cavity organs, it causes obstruction of esophagus, stomach and intestine, followed by dysphagia, vomiting or intestinal obstruction, and difficulty in defecation. 3.Hemorrhage signal: Tumor in cavity organ causes blood vessel rupture and bleeding, such as blood in vomiting, blood in sputum, blood in stool and blood in urine, especially the positive occult blood which is invisible to naked eyes. 4. Change of defecation or urination habit. Prolonged diarrhea, mucus stool, bloody stool, especially alternating diarrhea and constipation. 5.Long-term untreated wound ulcers. If the wound of skin mucosa does not heal for a long time, it should cause serious. Attention. 6.Heartiness and persistent dry cough. Hospital examination of pharynx, larynx, trachea and lung should be conducted to exclude early cancer. 7.Tinnitus, hearing loss, nasal congestion and nasal bleeding should be considered as the possibility of nasopharyngeal cancer. 8.Tumor marker signal: When normal cells in human body transform to cancer, they will produce specific proteins, which are collectively called tumor markers. The concentration of tumor markers in blood can be detected to suggest the possibility of tumor. The common ones are carcinoembryonic antigen and digestive tract cancer, methemoglobin and liver cancer, mucus-associated antigen and ovarian cancer, and serum acid phosphatase and prostate cancer.