The mute voice after radiotherapy will usually recover gradually in about 2~4 weeks, which varies from person to person, some patients have a long time and some have a short time. The mute voice after radiotherapy may be due to the damage caused by radiation to the mucous membrane tissue of the throat, resulting in mucous membrane edema, and in severe cases, it may also cause mucous membrane rupture, which results in sore throat. You can choose relevant medication under the guidance of doctor, such as Golden Voice Dispersing Capsule, Open Throat Sword Spray and so on. In addition, there are some patients who also have sore throat and can choose pain relieving drugs such as lidocaine and dexamethasone to relieve the symptoms. In general, with the increase of radiotherapy, the mute voice and pain will appear, but after symptomatic treatment, usually in 2~4 weeks will gradually recover, but there are individual differences, can not be generalized. It is recommended to communicate with the doctor in charge in time, and actively treat the symptoms to avoid delaying the condition.