Sudden inability to hear and feeling blocked in the ear is a symptom of ear blockage, which may be caused by sudden deafness, abnormal function of the eustachian tube and cerumen impaction. 1. Sudden deafness: when the patient suddenly can not hear the ears feel blocked like may be sudden deafness, sometimes accompanied by dizziness, hearing loss, numbness around the ear and other symptoms. 2. Abnormal function of the eustachian tube: when the eustachian tube is blocked, narrowed or abnormally open, sudden deafness may occur. 3. Cerumen impaction: cerumen impaction is the excessive secretion of cerumen in the external auditory canal or the obstruction of cerumen discharge, so that the cerumen can not be discharged, there may be a sudden inability to hear the same phenomenon of blocked ears. When the ear suddenly can not hear the feeling of blockage, should actively go to the hospital, clear cause and actively cooperate with the doctor for standardized treatment.