Neutrophils 1.37*10^9/L are moderately decreased and can be due to etiology such as decreased neutrophil production or increased destruction. Neutrophils are important cells that play an anti-inflammatory role in the body, and their normal values range from 2 to 7*10^9/L. Neutropenia is graded as follows: 1.5~2.0*10^9/L is mild, 1.0~1.5*10^9/L is moderate, 0.5~1.0*10^9/L is severe, and less than 0.5 is granulocyte deficiency. A neutrophil of 1.37**10^9/L is considered moderate neutropenia. Neutrophils are produced by the bone marrow and most are destroyed in the spleen, and the neutrophil count is in dynamic equilibrium in normal subjects. Diseases such as aplastic anemia, primary myelofibrosis and other bone marrow hematopoiesis is reduced, which can lead to neutropenia; hypoproliferative leukemia, myelodysplastic syndromes, myeloma and other hematologic malignant diseases, the bone marrow normal hematopoiesis is inhibited, which can lead to a reduction in the production of neutrophils. Splenomegaly with hypersplenism, rheumatic immune diseases (rheumatoid arthritis, systemic lupus erythematosus, dry syndrome, etc.) can lead to increased destruction of neutrophils. All of the above causes can lead to neutropenia. It is recommended that the patient go to the hematology department in time, complete the bone marrow aspiration and biopsy, liver, gallbladder, pancreas, spleen ultrasound, antinuclear antibody spectrum and other related examinations to identify the cause of the disease, and then target the cause of the disease treatment.