Anemia means that the hemoglobin and red blood cell count in blood are lower than the lowest values of normal people of the same age and gender. Its symptoms are mainly pale, accompanied by dizziness, fatigue, palpitation, shortness of breath and so on. So? Experts pointed out that anemia will not cause leukemia, and the causes of leukemia mainly include the following aspects: (1) virus: It has been confirmed that leukemia virus can be isolated from spontaneous leukemia tissues of chickens, rats, cats, cows and gibbons, and the virus is a retrovirus of type C. The viral etiology of human leukemia has been studied for decades, but so far only adult T-cell leukemia is definitely caused by lt-cell leukemia virus-1(HILV- 1). HILV- 1 is contagious, which can be transmitted through sexual intercourse and blood transfusion, and can also be transmitted from mother to child through breast milk. (2) Chemicals and poisons: Benzene has definite effects on leukemia, mainly acute myeloid leukemia, erythroleukemia and chronic myeloid leukemia. Alkylating agents and cytotoxic drugs can cause secondary leukemia. Secondary leukemia caused by tumor or connective tissue disease chemotherapy, that is, the second tumor, mainly acute non-lymphocytic leukemia, often has a pancytopenia period before the onset. Drugs used to treat psoriasis, such as dimorpholine, ethirimide, diketopiperazine, etc., are extremely strong substances that cause chromosome aberration, and can cause secondary acute leukemia, mainly acute promyelocytic leukemia, which usually occurs 1-7 years after taking the drug. (3) Radiation: Ionizing radiation has definite effect on leukemia, and its effect is related to radiation dose and irradiation site. A large dose or several small doses of radiation have leukemia effect. Whole body irradiation, especially bone marrow irradiation, can cause bone marrow suppression and immunosuppression. Chromosome breaks and aberrations can still be observed several months after irradiation, and then acute non-lymphocytic leukemia, acute lymphocytic leukemia and chronic myeloid leukemia can be induced. There is often a bone marrow suppression period before the onset, and its incubation period is about 2- 16 years or less. There is no definite basis whether diagnostic radiation will cause leukemia, but intrauterine radiation in pregnant women will increase the risk of leukemia after birth. (4) Genetic factors: Some leukemias are related to genetic factors. If one identical twin suffers from leukemia, the probability of suffering from leukemia is 20%. A few leukemias are familial, and familial leukemia accounts for 7% of the total number of leukemia cases. Occasionally, congenital leukemia can also be seen. Some hereditary diseases are often accompanied by high incidence of leukemia, including Down's disease, Bloom's disease, Creutzfeldt-Jakob disease, Fanconi disease and Wiskott-aldridge syndrome. Most of these hereditary diseases have chromosome aberrations and breaks.

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