I'm just reporting what these studies said.
I had a massive relapse of hyperacusis that lasted 10 weeks after a dental X-ray I had, I am incredibly sensitive to radiation so I don't think it's as harmless as a walk on the beach. I hadn't had any relapses for over 2 years and then the morning after the X-ray, it came back very severely. I couldn't bear the sound of any noise, even people's voices and I felt inflammation pain in my ears and all down my neck and jaw (they X-rayed my jaw) - I thought an inflammation response of my immune system to the X-ray. After 5 weeks of severe pain, I went to the doctor, explained the situation, he believed me and gave me anti-inflammatories which I took for another 5 weeks before the situation resolved and my hearing returned to normal.
Incidently, the same thing happens if I speak on a cell phone. I can text but not talk on the phone because I can't have it near my ear or head.