Mute voice is usually caused by physiological factors, excessive use of voice, inflammation and other reasons. 1. Physiological factors: Teenagers may experience hoarseness when their voices change, but their voices will return to normal after they pass through this period. During this period, you should pay attention to keep your neck warm and avoid getting cold. 2. Excessive use of the voice: Specialized occupational groups may experience hoarseness if they talk for a long time and use their voice excessively, which can be relieved by resting. 3. Inflammatory stimulation: Inflammatory stimulation caused by colds, acute upper respiratory tract infections, etc. leads to congestion and edema in the throat area, resulting in a muffled voice, which may be accompanied by sore, dry throat and other symptoms. Chronic laryngitis, vocal polyps, vocal cord nodules, laryngeal cancer and other diseases can also affect the throat, resulting in a mute voice. Patients are advised to seek prompt medical attention from a doctor for a clear diagnosis and treatment.