There are many reasons for deafness, that is, hearing impairment, and the common causes are cerumen blockage, otitis media, and sudden deafness. 1. Cerumen blockage: If the patient has more cerumen in the ear, causing the ear canal to be blocked; in addition, inflammation of the external auditory canal leads to swelling of the ear canal, secretions blocking the ear canal, etc., all of which can affect sound conduction, thus leading to hearing loss and inability to hear things in the ear. 2. Otitis media: Inflammatory lesions in the middle ear caused by bacterial and viral infections can lead to ear pain, increased ear canal secretions, hearing loss and tinnitus, and other symptoms, which can also cause hearing loss. 3. Sudden deafness: it refers to the sudden and unexplained sensorineural hearing loss within 72 hours, which can lead to hearing loss and even deafness, accompanied by tinnitus, stuffiness in the ear, dizziness, nausea and other symptoms. In addition, tympanic membrane perforation, drug deafness, old age, etc., can also cause deafness, so you need to go to the hospital in time to check and identify.