The causes of low white blood cells in clinical practice are as follows: 1. Physiological low white blood cells, which are often not greatly reduced and fall within the low limit of the normal range, are also mildly reduced and do not have symptoms, which do not require special treatment and can be reviewed regularly. 2. Pathological low white blood cells caused by certain diseases, such as myelodysplastic syndromes of bone marrow hematopoietic dysfunction, aplastic anemia, viral infections, tuberculosis, tumors and other diseases may lead to leukopenia. 3. 3. Long-term exposure to radiation and chemotherapy for tumors can lead to bone marrow suppression and leukocytopenia. Therefore, through the analysis of the above points, there are many causes of low white blood cells, and the decrease in white blood cells will have an adverse effect on the human body and increase the risk of human infection, so you should apply drugs that raise white blood cells, such as Ricorun tablets, Diyu Boost tablets and so on.