Dumb voice with phlegm may be caused by excessive use of the voice, but also can not be ruled out is caused by acute pharyngitis, colds and other diseases, you should consult a doctor in time to find out the cause of the disease. 1. Excessive use of the voice: If the patient usually uses his voice too much, or long-term smoking and drinking, eating spicy and irritating food, exposure to air pollution and other factors, it is easy to lead to chronic inflammation of the throat. It is easy for the mucous glands in the throat to secrete some mucous secretions, which can easily lead to chronic congestion and swelling of the mucous membrane of the vocal cords, and the symptoms of mute voice. 2. Acute pharyngolaryngitis: it may be the cause of bacterial infection, but it is not excluded that it is caused by viral infection. Usually there will be hoarseness, but also sore throat, cough, phlegm, generalized fever and other symptoms. 3. Cold: It is a common disease of the respiratory system, mostly caused by viral infection. Colds can lead to acute congestion and edema of the mucous membrane of the throat, and the inflammatory response can lead to phlegm and hoarseness. There may be other reasons for the mute voice with phlegm, and you should consult a doctor in time to clarify the specific cause and get appropriate treatment if necessary.