In otosclerosis, tinnitus is due to

Cochlear otosclerosis causes sensorineural hearing loss probably due to the liberation of toxic materials into the inner ear fluid, so tinnitus is heard. Clinical features Hearing loss Paracusis willisii Tinnitus: It is more commonly seen in cochlear otosclerosis and in active lesions. Veigo Speech Ref: Diseases of EAR, NOSE and THROAT by PL Dhingra; 7th Edition; page no.95, 96