https://en.wikipedia.org/wiki/Hyperacusis#Treatment
The most common treatment for hyperacusis is retraining therapy which uses broadband noise. Tinnitus Retraining Therapy (TRT), a treatment originally used to treat tinnitus, uses broadband noise to treat hyperacusis. Pink noise can also be used to treat hyperacusis. By listening to broadband noise at soft levels for a disciplined period of time each day, patients can rebuild (i.e., re-establish) their tolerances to sound. Another treatment method is the Berard Auditory Integration Training. When seeking treatment, it is important that the physician determine the patient's Loudness Discomfort Levels (LDL) so that hearing tests (brainstem auditory evoke response) or other diagnostic tests which involve loud noise (MRI) do not worsen the patient's tolerance to sound. If people have access to medical care, steroids are used to treat hyperacusis within 72 hours of the onset of the condition. Treatment is necessary because sounds over 85db are harmful, and entertainment in some public places, such as live music, have sound levels of around 110 to 120 db, (Examples of sound pressure and sound pressure levels).