There are many reasons for coughing all the time, not necessarily caused by the lungs, but also allergic pharyngitis, reflux esophagitis, drug effects and so on. 1. Allergic pharyngitis: most often seen at night or early morning, discomfort in the throat, difficult to suppress the desire to cough, but usually no phlegm to cough up. 2. Reflux esophagitis: a clinical syndrome characterized by coughing due to the reflux of stomach acid and other gastric contents into the esophagus. 3. Drug effects: Angiotensin inhibiting enzyme drugs such as captopril, whose common adverse effect is an irritating dry cough. Old cough has other causes, such as chronic obstructive pulmonary disease, lung cancer, cough variant asthma, eosinophilic bronchitis, rhinitis sinusitis nasal secretion reflux stimulation caused by cough. It is recommended that patients go to the hospital in a timely manner to clarify the cause of the disease and standardize the treatment under the guidance of the doctor.