High neutrophil ratio is the proportion of neutrophils in the total number of white blood cells exceeding 50~70%, which can be categorized into physiological high and pathological high. 1. Physiological high: such as pregnancy, childbirth, ovulation, etc. In addition, strenuous exercise, after overwork, nervousness and other emotional stimuli can also lead to high neutrophil ratio. 2. Pathologically high: (1) Acute infection: such as staphylococcus aureus, hemolytic streptococcus, streptococcus pneumoniae infection. (2) Serious tissue injury or necrosis: such as acute myocardial infarction, major surgery, severe trauma, large-area burns and so on. (3) Tumor disease: such as liver cancer, lung cancer, pancreatic cancer, etc. (4) Blood system diseases: such as true erythrocytosis, chronic granulocytic leukemia, etc. (5) Acute poisoning: lead poisoning, sleeping pill poisoning, etc. Patients with high percentage of neutrophils should consult a doctor in time and follow the doctor’s instructions for examination to clarify the diagnosis of the disease.