Bronchoscopy is divided into general bronchoscopy and painless bronchoscopy, with general bronchoscopy being painful and painless bronchoscopy being less painful. The examination time of bronchoscopy is generally about half an hour without accident and without other microscopic operations.1. General bronchoscopy: general bronchoscopy is when the patient is under local anesthesia and the bronchoscope enters the airway through the mouth or nose for examination. Patients are often in pain and cannot cooperate well with the examination due to discomfort, so it is less used clinically; 2. Painless bronchoscopy: In order to reduce the pain of bronchoscopy and enable patients to better cooperate with bronchoscopy, bronchoscopy is performed under local and general anesthesia, usually with propofol or pethidine and other drugs under the operation of a professional physician, and after anesthesia After the anesthesia, the bronchoscope will enter the airway through the mouth or nose for examination. Before the bronchoscopy, relax, do not be nervous and fearful, fast 4 hours before the examination, to avoid choking, mis-aspiration and obstruction of the airway during the examination.