The blood test showed low white blood cells.

(1) Drug factors: There are many drugs that can cause leukopenia, mainly including anticancer drugs, chloramphenicol, sulfanilamide anti-inflammatory painkillers, drugs for treating hyperthyroidism, drugs for treating diabetes, etc.

(2) Infection factors: Many infectious diseases can cause cytopenia, such as injury, virus infection, mycoplasma pneumonia, infectious pneumonia, miliary tuberculosis and so on.

(3) Hematological diseases: such as acute leukemia, malignant lymphoma, malignant histiocytosis, hypersplenism, aplastic anemia, etc.

(4) Exposure to radiation: such as exposure to X-rays, cobalt 60 and phosphorus 32.

(5) Others: connective tissue disease, systemic lupus erythematosus, liver cirrhosis, especially splenomegaly.

It is suggested that you can eat more foods that can improve white blood cells in your diet, such as jujube, ginseng and bee honey. These are all very good. You can also take vitamin B4 and shark liver alcohol orally. To further investigate the cause, you can hang an expert consultation on universal medicine.