Leukemia is a malignant neoplastic disease of the hematopoietic system, which generally does not appear suddenly, mostly due to certain factors long-term damage to the body, and eventually develop into leukemia, only most of the onset of the more rapid, symptoms may appear suddenly, the main factors causing leukemia are as follows: 1, chemical factors: if often exposed to some benzene compounds are prone to induce leukemia, in addition to anti-tumor cell drugs, such as methylbenzylhydrazine , nitrogen mustard VP16, cyclophosphamide, VM26, etc. also have certain possibility to cause leukemia; 2, physical factors: if the usual frequent exposure to ionizing radiation, such as operators of medical imaging examinations, researchers of ionizing radiation, electronic picture tube production personnel, etc., if not well protected, it may induce leukemia. In some diagnosis and treatment, the prevalence of leukemia is also increased in people who use high doses of radiation; 3, viral infection: if infected with human T-cellophilic virus, it is also easy to induce leukemia; 4, genetic factors: if a family member has a history of leukemia, the probability of leukemia in children will be higher than usual; 5, other: such as lymphoma, multiple myeloma, etc. can also develop into leukemia when the disease deteriorates Other: lymphoma, multiple myeloma, etc. can also develop into leukemia when their condition deteriorates. Patients with leukemia should actively cooperate with the doctor’s treatment, keep a comfortable mood, avoid anxiety, depression and other emotions, usually can communicate more with family and friends, timely relief of bad mood.