Leukemia is a malignant clonal disease of the hematopoietic system, mainly caused by abnormalities in the patient’s own bone marrow hematopoietic function, is not an infectious disease, and therefore not contagious, and naturally there are no three ways of leukemia transmission. Commonly triggered leukemia factors are infection, physical factors, chemical factors, genetic factors: 1, infection: mainly caused by viral infection, such as human T-lymphotropic virus type I, viral infection of the body, can be activated to induce leukemia, the risk of infection will increase in people with abnormal immune function; 2, physical factors: long-term exposure to ionizing radiation, can lead to a decrease in the body’s immunity, while the bone marrow suppression, all of which can lead to 3, chemical factors: some cancer patients who apply anti-tumor drugs for a long time, such as topoisomerase II inhibitors, alkylating agents, cyclophosphamide or long-term exposure to benzene and nitrosamines, may also lead to the occurrence of leukemia; 4, genetic factors: leukemia has a certain genetic factor, if there is a family history of leukemia, the chances of developing leukemia will increase. In addition, some blood diseases are also prone to leukemia, such as lymphoma, multiple myeloma, etc. Therefore, you should avoid long-term exposure to ionizing radiation and chemicals such as benzene, avoid smoking, and have regular medical checkups for early detection and treatment. Develop good dietary and lifestyle habits on a daily basis and increase exercise appropriately to enhance physical fitness and reduce the risk of disease.