Bronchoscopy plays an important role in the diagnosis of bronchial and lung diseases, such as airway and lung tumors, interstitial lung disease and granulomatous disease and lung infections, all of which require Bronchoscopy is required to determine the cause of the disease. People who are allergic to anesthetics should not undergo bronchoscopy, nor should those with severe cardiopulmonary insufficiency and cardiac arrhythmias. Bronchoscopy is also dangerous for people with severe coagulation disorders. Patients with respiratory infections or asthma attacks need to control their symptoms before bronchoscopy can be performed. Before the examination, you need to actively cooperate with the doctor and inform him/her in detail about the diseases you have previously suffered from in order to avoid any physical harm during the examination.