Normal blood counts do not rule out asthma. Blood counts may be normal or abnormal during an asthma attack. Bronchial asthma, abbreviated as asthma, is a heterogeneous disease characterized by chronic airway inflammation and airway hyperresponsiveness. Clinical manifestations include recurrent episodes of wheezing, shortness of breath, chest tightness, or cough. The diagnosis of asthma is confirmed by clinical symptoms, signs, pulmonary function tests, and allergen tests. The main purpose of routine blood tests is to find out whether the blood cells of the examinee are abnormal, so as to know whether the patient has an infection or suffers from blood-related diseases. If asthma is suspected, it is recommended to go to a regular hospital in time to clarify the allergens and take treatment under the guidance of the doctor.