9-year-old girl suddenly got leukemia may be: viral infection and immune function abnormalities, ionizing radiation, chemical substances, genetic factors.
1. Viral infection and abnormal immune function: after invading the organism, the virus will be latent in the host cells, and in some cases, it can be activated to express and induce leukemia. Those with abnormal immune function will also have an increased probability of developing leukemia.
2. Ionizing radiation: large area or large dose of X-rays or other radiation irradiation will cause bone marrow suppression and decrease of body immunity, resulting in pathological hematopoiesis, leading to leukemia and so on.
3. Chemical factors: exposure to benzene, chemotherapy drugs, etc. can cause chromosomal aberrations or leukemia.
4. Genetic factors: If there is a relative with leukemia in the family, the probability of the offspring having leukemia increases.
There may be other reasons for sudden onset of leukemia, and it is important to seek medical attention in a timely manner to avoid delays.