*_4 CUSIS_* :- 1. *Hyperacusis*: Sensitivity to loud sounds, associated with *Bell's palsy*. 2. *Paracusis Willis*: Ability to hear better in noisy environments, associated with *Otosclerosis*. 3. *Diplacusis*: Distorted hearing or double hearing, associated with *Meniere's disease*. 4. *Presbyacusis*: Age-related sensorineural hearing loss (*SNHL*). Regards Code:- *IND408*(CEREBELLUM)