Conductive hearing loss occurs when sound waves cannot reach the inner ear. The cause may be earwax buildup, fluid, or a punctured eardrum. Medical treatment or surgery can usually restore conductive hearing loss. Sudden Hearing Loss Sudden sensorineural hearing loss, or sudden deafness, is a rapid loss of hearing.
https://www.nia.nih.gov/health/hearing-loss-common-problem-older-adults

