Mixed deafness, including conductive deafness, sensorineural deafness, mainly divided into the following reasons: 1, the same disease at different stages of development, such as patients with suppurative otitis media, early when there is a perforation of the tympanic membrane, auditory ossicular chain of the damage, the main manifestation of conductive deafness, with the further development of lesions encroaching on the labyrinth of the inner ear and other parts of the ear, the formation of sensorineural deafness, and finally the patient to do a checkup when manifested as a mixed deafness. 2, different diseases in the patient are reflected in the patient, the common is the patient itself purulent otitis media, can be manifested as conductive deafness of the ear, and then the patient occurs sudden neurological deafness, and finally the patient to do a checkup when the conductive deafness combined with neurological deafness, thus reflecting the mixed deafness. In conclusion, the causes of mixed deafness are mainly the above two major types.