Increasing white blood cells requires removing the causative factors before treating the symptoms. Low white blood cells are usually related to drug use, exposure to chemicals and congenital granulocyte deficiency, etc. At present, we need to get rid of the disease-causing factors as soon as possible, and carry out drug treatment and hematopoietic stem cell transplantation. 1. Drug use: for example, prolonged use of alkylating agents, anti-tumor drugs, etc. may cause a decrease in the number of white blood cells, and the number of white blood cells will gradually increase after stopping or reducing the dosage. 2. Exposure to chemical substances: prolonged exposure to benzene, mercury, lead, etc. may lead to a decrease in the number of white blood cells. If the environment is improved in time, the amount of white blood cells can be controlled to decrease gradually, and caffeic acid tablets should be taken to replenish white blood cells if necessary. 3. Congenital granulocyte deficiency: mostly caused by genetic factors, when the gene mutation, hematopoietic stem cell defects are prone to white blood cell count reduction, it is necessary to do hematopoietic stem cell transplantation. If the white blood cells continue to decline, it is recommended to consult hematology as soon as possible, from which to analyze whether there is thrombocytopenia, erythrocytopenia, etc., and then according to the diagnosis results of targeted treatment.