The occurrence of loss of voice is related to mental and emotional. These patients are mostly weak, anemic, neurotic, prone to mental tension and agitation, when panic, anger, apprehension, sadness, etc. are the triggers to cause excessive mental tension and violent mood swings, leading to the onset of the disease. Clinically, loss of voice should be distinguished from vocal fold paralysis and laryngeal muscle fatigue: 1. Vocal fold paralysis: hoarseness of voice due to paralysis of the motor nerve of the larynx. On laryngoscopic examination, the vocal folds are seen in a paramedian position and cannot be inducted or abducted, or only inducted but not abducted. Most often there is a history of injury to the recurrent laryngeal nerve or a history of extrasystoles. It can be caused by brain diseases such as brain tumor, stroke, demyelinating disease or damage to the nerve innervating the laryngeal muscle. Nerves can be damaged by tumors, trauma, viral infections, neurotoxicity such as lead, diphtheria toxin, and other damage paralysis. The disease is divided into two categories: central paralysis and peripheral paralysis, with the latter being the most common, mainly due to damage to the laryngeal nerve, which belongs to the category of laryngeal mute in Chinese medicine. 2, laryngeal muscle fatigue (laryngeal muscle weakness): vocal folds pale, relaxed and weak, vocal folds are generally pike or long triangular fissure when vocal, or bow-shaped fissure; there are also vocal folds can still be closed, but the vocal folds are relaxed and tension is not enough.