Cough do lung CT is fine, and there is no rhinitis, may be due to cough variant asthma, chronic pharyngitis, gastroesophageal reflux, drug factors. 1. Cough variant asthma: it is a special type of asthma with chronic cough as the main or only symptom. When lung CT is done, there may be no obvious abnormality in the lungs, but the lung ventilation function may decrease. 2. Chronic pharyngitis: it may be characterized by dry throat, itchy throat, pharyngeal discomfort, foreign body sensation and irritating cough. 3. Gastroesophageal reflux (GERD): Coughing at night when lying down is obvious, mainly due to the reflux of gastric contents that irritate the pharynx and lead to coughing. 4. Cardiac insufficiency: due to the presence of pulmonary stasis, can lead to cough. 5. Drug factors: such as captopril, enalapril and other antihypertensive drugs, with the adverse effects of cough, you can pay attention to screening the history of drug use. In summary, coughing lung CT is fine, there is no rhinitis, it is recommended to consult a doctor in a timely manner, under the guidance of a specialist physician to improve the relevant examination, clear cause of the targeted treatment.