There are many reasons for low neutrophil-lymphocyte percentages, which may be due to viral infections, autoimmune diseases, and impaired maturation of granulocytes in bone marrow hematopoiesis. 1. Viral infections can cause a decrease in neutrophils and lymphocytes and can be treated with antiviral medications such as ribavirin and entecavir. 2. Many autoimmune diseases can also lead to a decrease in lymphocytes and neutrophils, and commonly used drugs include glucocorticoid hormones such as prednisone and dexamethasone. 3. Bone marrow hematopoietic cell maturation disorders can also cause neutrophil and lymphocyte reduction, and also need to pay attention to the situation of red blood cells and platelets. If you have any of the above conditions, you should consult a doctor in time, and under the doctor’s guidance, complete the relevant examinations, identify the cause of the disease, and then carry out the appropriate treatment. The use of drugs must follow the doctor’s instructions, not blindly use their own drugs, in order to avoid adverse consequences.