Blood cancer is leukemia, and blood cancer is the common name of leukemia. Leukemia is the most common malignant disease in the blood system, and its pathogenesis is not very clear at present. Clinical researches have found that the occurrence of leukemia is related to physical factors, chemical factors, biological factors and genetic factors. After a patient suffers from leukemia, due to the massive proliferation of leukemia cells in the bone marrow, the normal hematopoietic function is destroyed, and a series of symptoms such as anemia, infection, bleeding, organ infiltration, and so on, will appear. Patients with leukemia often show pale face, dizziness, fatigue, panic and chest tightness, sometimes bleeding from the nose and gums or vomiting blood, black stools, and bleeding spots and petechiae on the skin and mucous membranes. At the same time, most patients will also suffer from stomatitis, pneumonia, perianal infections, etc., which are very painful. After the appearance of these symptoms, patients often need to go to the hospital for examination, and the diagnosis of leukemia can be confirmed through blood tests that reveal obvious abnormalities, and then through bone marrow aspiration tests.