To determine whether a child’s leukocytes are more than 20,000 is serious, depending on the specific cause of the disease: 1, not serious: if the leukocyte elevation is caused by common bacterial infection, the child’s mental state is good, the appetite for food is also good, this time the timely application of cephalosporin anti-infection, the condition of most can quickly improve; 2, serious: if the child’s leukocyte elevation is caused by acute leukemia, this time there will often be anemia If the child’s leukocyte elevation is caused by acute leukemia, then there will often be anemia and even high fever that does not subside and other symptoms, chemotherapy should be carried out in time. This time there will be serious consequences, such as serious infections, and even a drop in platelets.