How leukemia is acquired is not yet completely clear. 1. Leukemia is a malignant disease of the blood system, characterized by a marked increase in the number of primitive cells in the bone marrow. So far, the pathogenesis of leukemia cannot be fully clarified, and it may be related to factors such as genetic factors, prolonged exposure to radioactive substances (X-rays, etc.) and/or harmful chemicals (formaldehyde, phenol, etc.). 2. Leukemia patients are often accompanied by gene mutation or fusion gene expression, and some leukemia patients have a history of prolonged exposure to radiation or harmful chemicals (phenol, formaldehyde, benzene, etc.). Therefore, the development of leukemia may have some correlation with these factors, but the specific correlation is not yet very clear. 3. If there are patients with hematologic malignant diseases (e.g., leukemia, multiple myeloma) in the immediate family, their likelihood of developing leukemia may be higher than that of other people. Diagnosis and treatment should be made under the supervision of a physician.