Generally long time cough, may be after infection cough, gastroesophageal reflux disease, chronic pharyngitis and other reasons. 1. Post-infectious cough: may be due to pathogens caused by tracheal damage is not repaired, this period of time the respiratory tract is sensitive to the outside world, easy to cause coughing, resulting in coughing old bad. Post-infectious cough usually lasts for 3 to 8 weeks and is often self-limiting, mostly relieved on its own. 2. Gastroesophageal Reflux Disease (GERD): stomach contents can reflux into the pharynx or airway, causing irritating cough. If left untreated, long-term coughing may occur. 3. Chronic pharyngitis: Chronic inflammation of the submucosal layer of the pharynx and lymphatic tissues can cause throat discomfort, dryness, itchiness and coughing, and some patients may have a slight pain in the pharynx. Long-term cough can also be seen in other diseases such as tuberculosis. If the symptoms are not relieved or aggravated, it is recommended to consult a doctor in time, follow the doctor’s instructions for further examination, clarify the cause with the help of the doctor, and carry out targeted treatment or therapy.