Hoarseness, also known as hoarseness, is a characteristic symptom of vocal cord lesions. The degree of the lesion has different effects on the function of pronunciation, the lighter the tone becomes lower and coarser, the heavier the pronunciation is hoarse, and the more serious can only whisper. The common causes of hoarseness are as follows: a. Congenital malformations: such as laryngeal webbing is often located between the front of the two sides of the vocal folds, the smaller range of occasional hoarseness, the larger ones are born with hoarseness, faint or even loss of voice, laryngeal air sac expansion of hoarseness occurs when strong exhalation, cough or increase the internal pressure of the larynx. The hoarseness also disappears after calm breathing and air expulsion. Acute inflammation: The main symptom of acute laryngitis is hoarseness. In the lighter cases, the tone is lowered, the voice is rough, the pronunciation is labored, and the pronunciation becomes sandy because of the sticky laryngeal secretions, which restrict the vocal fold tension and closure. The laryngeal diphtheria often has hoarseness and weakness, while the pseudomembrane is formed and the mucous membrane is swollen, the hoarseness is aggravated to the loss of voice. Chronic inflammation: The common symptom of chronic laryngitis is coarse pronunciation, lower tone than normal, intermittent at first, gradually becoming persistent, heavier in the morning, but loss of voice is rare. Vocal cord nodules and polyps: Vocal cord nodules and polyps are common diseases causing hoarseness, and the degree of hoarseness is related to the location and size of its growth. V. Benign tumors: such as papilloma and amyloidosis can cause slowly progressive hoarseness. Malignant tumors: the hoarseness of laryngeal cancer is progressive and gradually increases. Eventually, it can reach complete loss of voice. When the supraglottic nerve is paralyzed, the vocal cords lose normal tension, the vocal folds are skewed, the patient’s voice is monotonous, low and rough, and cannot pronounce high notes. In the case of bilateral paralysis of the laryngeal recurrent nerve, both vocal folds are fixed in the middle position, and hoarseness is obvious. Hysterical hoarseness: It can be sudden, difficult to pronounce or even completely lose voice, but the patient cries and laughs, coughs normally and loudly, and the hoarseness recovers very quickly, but it is easy to recur.