Patients who want to recover from deafness should first clarify the cause of deafness in order to treat it symptomatically, as follows: 1. External ear canal diseases: such as foreign bodies in the external ear canal and cerumen embolism, etc. Hearing can be recovered after removing foreign bodies and cerumen embolism. 2. Middle ear diseases: such as acute and chronic otitis media, hearing can be recovered after giving anti-infection and symptomatic treatment. 3. Inner ear diseases: such as sudden deafness, etc. Hearing can be recovered after giving medication to dilate blood vessels, reduce blood viscosity and increase blood oxygen pressure. Blood viscosity and oxygen partial pressure may be improved. After deafness occurs, patients should first go to the hospital for otolaryngology, head and neck surgery, do endoscopy and ear CT examination to clarify the cause of deafness, and then treat it symptomatically.