Generally, fasting starts 4 hours before the start of bronchoscopy and drinking is prohibited 2 hours before. The main purpose of fasting is to prevent choking or aspiration ulcers caused by vomiting during anesthesia or bronchoscopy. If a patient has an appointment for bronchoscopy the next morning, the doctor will inform the patient in advance not to eat or drink anything after 10 pm the night before the examination, while patients who have an appointment for examination the next afternoon will be informed in advance not to eat or drink anything after 10 am. Patients can usually start eating and drinking 2 hours after the examination, but it is generally recommended to eat and drink a liquid diet first. You can try to drink water before eating to see if you choke, and then slowly eat when you don’t choke. If choking occurs, tell the doctor in advance to do other special treatment, which requires the patient’s attention in advance.