Chest X-ray, blood routine is normal, but still cough, its treatment needs to be directed to the cause of cough. If cough variant asthma, inhaled glucocorticoids can be used; if the cough is caused by gastroesophageal reflux, proton pump inhibitors and other drugs can be selected; if the cough is allergic, antihistamines can be selected. 1. Cough variant asthma: cough variant asthma patients generally chest X-ray, blood test is normal, but the bronchodilator test is mostly positive, this situation can be selected under the guidance of the doctor inhaled glucocorticosteroid combined with adrenergic agonists, such as budesonide formoterol powder inhaler, and at the same time, can be taken to the leukotriene receptor antagonist, such as montelukast and so on. 2. Gastroesophageal reflux disease: when gastric acid reflux stimulates the trachea, it will also cause cough symptoms, at this time, the patient’s chest X-ray, blood routine is normal, you can choose proton pump inhibitors such as omeprazole. 3. Allergic cough: most of the allergic cough and allergy-related, and the patient’s chest X-ray, blood routine is mostly normal, first of all, need to stay away from allergens, and secondly, you can choose antihistamines, commonly used in loratadine, cetirizine and other drugs. Chest X-ray, blood routine is normal, but also cough, can also be caused by other diseases. If the symptoms are not relieved or aggravated, it is recommended to consult a doctor in time, under the guidance of the doctor, improve the relevant examination, to clarify the specific causes, and actively comply with the doctor’s instructions for treatment.