High neutrophil percentage may be caused by physiological factors such as strenuous exercise and physical labor, or it may be caused by infections, poisoning and other diseases. 1. Physiological factors: If the patient has undergone strenuous exercise or excessive physical labor before the routine blood test, it will lead to a high neutrophil percentage in the patient’s routine blood test results. 2. Infectious diseases: Infectious diseases such as acute pharyngitis and bronchitis are mainly caused by viral and bacterial infections, so patients will have high neutrophil percentages in routine blood tests. Acute pharyngitis will lead to the patient will have a sore throat, swallowing discomfort, dry and itchy throat and other symptoms. In addition, patients with bronchitis may also experience symptoms such as coughing and sputum. When patients have a high percentage of neutrophils in routine blood tests, it may be caused by physiological factors and does not require treatment, but it may also be caused by pathologic factors such as intoxication and infection, so patients should consult a doctor in a timely manner and follow the doctor’s instructions for treatment.