Laryngoscopy is clinically known as laryngeal endoscopy. Some reflux laryngitis can be detected by pharyngoscopy. Reflux pharyngitis is usually caused by gastroesophageal reflux, which results in repeated entry of stomach acid into the throat, causing burning and repeated irritation of the mucous membranes in the throat. When this symptom occurs, the patient will have a foreign body sensation, dryness, pain burning sensation and other symptoms in the throat. Using laryngeal endoscopy, erythema of the tectal cartilage, erythema and edema of the vocal cords, posterior connective hypertrophy, and edema of the tectal cartilage can be seen microscopically. A 24-hour esophageal-pharyngeal pH test can also be done to clarify the diagnosis. Before laryngeal endoscopy, local anesthesia of the oral and nasal cavities is usually required, and after the anesthesia takes effect, the fiberoptic catheter is placed without obvious pain. When the fiberoptic catheter reaches the larynx, the vocal cords, the pyriform fossa, and the laryngeal wall can be examined. When a patient is diagnosed with reflux laryngitis, it is important to treat the condition promptly to avoid aggravation.