Diseases that can be detected by laryngoscopy include inflammation of the larynx, polyps of the vocal cords, malignant tumors of the larynx, and malformations of the structures. Laryngoscopy mainly involves the use of a probe to examine the larynx, the root of the tongue and the lower part of the vocal folds. Inflammation of the pharynx can be observed as congestion and edema of the mucosa, and in severe cases, erosion can occur; polyps of the vocal cords can be observed as smooth-surfaced swellings near the vocal cords under laryngoscopy; and malignant tumors of the pharynx can be understood through tissue biopsy to understand the nature of the lesion. In addition to the above diseases, structural developmental malformations of the pharynx can also be diagnosed by laryngoscopy. The examination needs to be carried out under the guidance of a professional doctor, and it is recommended to relax, avoid tension and actively cooperate with the examination.