Laryngoscopy is a routine examination of the ear, nose and throat and is necessary when there is an indication for laryngoscopy. However, laryngoscopy is not recommended for patients with severe heart disease and coma. Laryngoscopy may irritate the throat, causing throat discomfort or sensitivity, which may lead to vomiting and nausea. In addition, laryngoscopy can cause a small amount of bleeding and pain in the mouth and nasal passages. Vomiting and nausea are normal physiological reactions, and a small amount of bleeding is not a threat to health, so there is no need to worry too much about it, and a laryngoscopy will not cause any harm. In the case of severe heart disease and coma patients, their reaction to the test is too intense or they are unable to breathe on their own, which is not conducive to laryngoscopy, and in serious cases, it may even be life-threatening, and therefore laryngoscopy is not recommended for this group of people. If you find hoarseness of the throat, choking and coughing, as well as unexplained shortness of breath and a foreign body sensation in the throat, you should consult a doctor in time and follow the doctor’s instructions to do laryngoscopy. Note: The human throat is sensitive. Try to keep an empty stomach to do laryngoscopy, so as to avoid nausea, vomiting and so on, high blood pressure should be lowered to normal in advance before doing.