Leukocytosis is common in leukemia patients, but the increase in the number of white blood cells does not confirm the diagnosis of leukemia, this statement is not rigorous. 1. Leukemia is a malignant tumor disease of the blood, in which the quantity and quality of white blood cells in the blood are abnormal. However, leukemia cannot be diagnosed by an increase in the number of white blood cells. Most leukemia patients have an increased number of white blood cells in their blood, but some types of leukemia patients do not necessarily have elevated white blood cell counts, and may even have decreased white blood cell counts. In addition, normal people may also have elevated white blood cells if they are infected by bacteria. 2. If there is an increase or decrease in white blood cells, accompanied by symptoms such as anemia, infection or easy bleeding, you need to be highly alert to the possibility of leukemia, and need to go to the hospital to do formal blood and bone marrow examination, such as immature white blood cells found in the bone marrow, and do pathological examination to clarify whether it is leukemia. The causes of elevated white blood cells are not always caused by leukemia. It is recommended to go to the hospital in time, complete the examination to clarify the cause of the disease, and then receive targeted treatment or therapy under the guidance of the physician.