Malignant tumor is a progressive developmental disease, and the physical condition gradually decreases after the onset of the disease, the later the disease is treated the more difficult it is, and the prognosis is extremely poor. As there are almost no special symptoms in the early stage of tumor, most of the patients are in the middle and late stage when they are diagnosed. Early detection and early treatment are very necessary. In Chinese medicine, the theory of “the upper work is not to treat the disease before it happens” is especially important in the diagnosis and treatment of tumor. The prevention work to prevent clinical attack of tumor is secondary prevention. It is very meaningful in terms of the degree of damage to the body, the psychological damage and the burden to the society, to cure those tiny tumors before there are any clinical symptoms. Other than body surface tumors, most other tumors are diagnosed by physical examination or other reasons. Then these tumors will also have traces to search. For example, lung cancer: early stage can be asymptomatic. Chute et al.’s analysis of 1539 cases of lung cancer showed that the most common symptoms at the time of diagnosis were in the order of wasting (46%), cough (45%), shortness of breath (37%), weakness (34%), hemoptysis (27%) and chest pain (27%), etc. There was no significant difference between the performance of non-small cell lung cancer (NSCLC) and small cell lung cancer (SCLC). The clinical manifestations of lung cancer are complex and can be broadly categorized into four groups, including extra-pulmonary manifestations caused by primary mass, intrathoracic spread, distant metastasis and tumor paraneoplastic syndrome. Symptoms caused by primary tumor include: cough, hemoptysis, dyspnea, chest pain, wheezing, etc.; intra-thoracic spread of tumor can lead to: hoarseness, phrenic nerve palsy, dysphagia, superior vena cava compression syndrome, pleural effusion, pericardial effusion, Pancoast syndrome, etc.; distant metastasis includes brain metastasis, bone metastasis, liver metastasis, adrenal metastasis and corresponding clinical manifestations of metastasis of other organs; extrapulmonary The manifestations refer to the symptoms and signs not directly related to tumor invasion or metastasis, i.e. tumor paraneoplastic syndrome. Esophageal cancer: the most common early symptom is abnormal swallowing with a choking sensation. Gastric cancer: early gastric cancer mostly has no obvious symptoms. As the disease develops, non-specific symptoms similar to gastritis or gastric ulcer may gradually appear, including epigastric fullness or hidden pain, acidity, belching, nausea, occasional vomiting, loss of appetite, black stool, etc. Some patients have mild pressure pain in the upper abdomen. Progressive gastric cancer located in the pyloric sinus or gastric body can sometimes find a lump, which is often nodular and hard. When the tumor infiltrates into the adjacent organs or tissues, the mass is often fixed and cannot be pushed, suggesting that surgical resection is less likely. Colorectal cancer: symptoms such as change of stool pattern, blood in stool, abdominal pain, etc. should be alerted and examined in time to avoid delay. Liver cancer: the main symptoms come from liver cancer, hepatitis or cirrhosis. As subclinical liver cancer does not have any symptoms, some patients therefore doubt the diagnosis of liver cancer, thus delaying the time when there is still hope for radical treatment. When liver cancer becomes large from small to large, liver pain, poor appetite, abdominal distension, weakness, emaciation, abdominal mass, fever and jaundice may appear, but most of these are already symptoms in the middle and late stages. Rupture of hepatocellular carcinoma nodules may lead to acute abdominal pain (internal bleeding). Signs: The same can be caused by hepatocellular carcinoma with hepatitis and cirrhosis. Common signs include hepatomegaly with or without nodules, epigastric mass, jaundice, ascites, splenomegaly, swelling of lower limbs, etc.; if cirrhosis is obvious, there may be liver palm, spider nevus or vascular nevus in anterior chest and abdomen, varices of abdominal wall, etc. If the liver is large with nodules, liver cancer should be considered; sometimes the right upper liver cancer is only found under the ribs with a large liver but no mass can be found, or it shows the upper border of the liver moving up. Splenomegaly is a manifestation of portal hypertension in cirrhosis, and can also be caused by portal vein cancer thrombosis. Lower limb edema can be caused by low protein, ascites compression, or inferior vena cava carcinoma. Breast cancer: painless lump, breast cancer lump is infiltrative growth, even if the lump is small, if it involves the suspensory ligament of breast, it can cause skin adhesions, larger lumps can have skin edema, cellulite-like changes, nipple retraction or depression, lymph node enlargement and other symptoms, and later on, satellite skin nodules or even ulcers can appear. Nipple overflow: The overflow can be colorless, milky white, yellowish, brown, bloody, etc.; it can be watery, bloody, plasma-like or purulent. Cancerous overflow should be distinguished from nipple overflow caused by physiological, non-tumor breast diseases and systemic diseases. Nipple and areola abnormalities: shortening due to tumor invasion, pulling the nipple, making the nipple deviate to the side of the tumor, flattening, retracting and sunken nipple until it is completely retracted under the areola, invisible nipple, visible asymmetry of both nipples, nipple erosion is also one of the typical conditions. Other conditions such as: skin ulcers that do not heal for a long time should be noted as skin cancer; sudden changes in moles should be taken seriously to exclude the possibility of malignant melanoma; vaginal bleeding or contact bleeding in menopausal women should be noted as gynecological tumors such as cervical cancer and fallopian tube cancer.