The child’s mute voice is not good for a long time, it may be caused by frequent crying, throat diseases, thyroid tumors and so on. 1. Frequent crying: If your child cries a lot, it can lead to congestion and edema of the vocal cords, which can cause hoarseness and recurring episodes over a long period of time. 2. Pharyngeal diseases: If the child suffers from pharyngeal diseases, common representative diseases include chronic pharyngitis, vocal polyps, etc. These diseases can also lead to damage to the vocal cords, causing hoarseness and long-term bad situation. 3. Thyroid tumor: If the child has a thyroid tumor, compressing the recurrent laryngeal nerve, it can cause hoarseness, which will not be cured for a long time. The child’s voice is mute for a long time, there may be other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.