Whether to do laryngoscopy need to fasting need to follow the requirements of the local medical institutions of the Department of Otorhinolaryngology, which is subject to the patient’s ability to tolerate, the use of equipment and examination of the doctor’s skills and methods, different hospitals have different provisions, mostly recommended that the examination of the 4 ~ 6 hours before the fasting of food and water. Laryngoscopy can be divided into indirect laryngoscopy, fiberoptic laryngoscopy, electronic fiberoptic nasopharyngeal laryngoscopy and so on. During such examination, it often causes throat discomfort and reflex nausea, dry heaving, vomiting may occur if excessive satiety or drinking, and fainting or shock may occur in serious cases. It is recommended to consult your local doctor before performing a laryngoscopy to minimize severe discomfort or accidents during or after the examination.