'hyperacusis' is a symptom rather than a dysfunction or disorder. Treated by a otolaryngologist (a specialist ENT) doctor.
It's probably less well tolerated with age and ear parts start to wear-out with age.
The church Music Director is resigning because of 'hyperacusis. Even with musician grade hearing protection, she can't tolerate the sound and they play traditional music.
Some of the causes are mental and others require serious surgery.