High-tone sudden hearing loss with tinnitus

hello,

he has suffered for various months various dizziness. Some mild and some strong. After those two months, he suffers a high-tone sudden hearing loss accompanied by tinnitus . He takes cortisone and after 5 days he has almost completely recovered his hearing. Vestibulatory tests are performed, and a multichannel vestibular peripheral deficit is observed.

The audio metria of the SSHL is typical in a patient who has suffered sudden loss due to exposure to noise. Drop in 2000,3000, 4000 and 8000 Hz of 60dB.

What can be the motive?

thanks