Leukocyte 2.9×10∧9/L is a bit low. Leukocytes are an important part of the body’s defense system. Leukocytes are colorless, spherical, with a diameter between 7 and 20 μm. The normal value of leukocytes is (4-10)×10∧9/L. If the value of leukocytes is 2.9×10∧9/L, it is lower than the normal range when doing routine blood test. If the white blood cells are found to be low, it needs to be considered to be related to leukopenia, hypersplenism, hematopoietic dysfunction, radiation, malaria, viral infections and so on. If the white blood cells are low, it is necessary to do further relevant examinations to clarify the cause of the disease, and then according to the cause of the targeted treatment. Can not blindly treatment, because the cause of the disease is different, the specific treatment method will be different.