Leukemia is a blood disorder that affects the production and function of white blood cells in the bone marrow. Depending on the type and course of leukemia, the number of white blood cells may vary. Therefore, leukemia can be high or low white blood cells, depending on the condition. 
First, let's understand the role of white blood cells. White blood cells are an important part of the body's immune system, and they help the body fight off infections and other diseases. Normally, the number of white blood cells is maintained within a certain range, and if the number of white blood cells is abnormal, it may have a negative impact on the body. So, how does leukemia affect the number of white blood cells? Leukemia is an abnormal clonal disease of white blood cells that causes abnormalities in the production and function of white blood cells in the bone marrow. In some types of leukemia, such as chronic myeloid leukemia and chronic lymphocytic leukemia, the number of white blood cells may be abnormally elevated. In other types of leukemia, such as acute lymphoblastic leukemia and acute myeloid leukemia, the number of white blood cells may be abnormally low. 
Why is this happening? When abnormal white blood cell clonal proliferation in the bone marrow, they occupy space in the bone marrow, causing normal white blood cell production and function to be affected. In some types of leukemia, abnormal white blood cells can clog the blood vessels in the bone marrow, affecting normal blood circulation and causing the number of white blood cells to drop. In conclusion, leukemia can be either high or low white blood cells, depending on the condition. Understanding the type and course of leukemia, as well as changes in the number of white blood cells, can help doctors better diagnose leukemia. At the same time, patients should also actively cooperate with the doctor** and maintain an optimistic attitude in order to ** as soon as possible**.