The routine blood test for cancer may have elevated white blood cells, platelets, neutrophils and lymphocytes, etc., which varies according to the type of tumor and the change of condition. In the early stage of most tumors, such as esophageal cancer, bladder cancer, etc., the abnormalities of blood routine are seldom seen, and there are no obvious symptoms, and there are changes in blood routine only in the progressive stage. In the late stage of malignant tumors, malignant stroma appears, the body’s defense ability decreases, and the leukocyte and neutrophil ratio will be increased when infection occurs. 3. Hematological system tumors will have elevated specific indexes, such as elevated white blood cells in leukemia, increased lymphocytes in lymphoma; except for hematological system tumors, ovarian tumors will often have elevated platelets. In addition, in the process of cancer drug treatment, the blood count will also be affected, and the specific should be based on the doctor’s judgment, choose the appropriate treatment.