I have high pitch hearing loss in both ears due to working around very loud [90 to 115 Db] noises. Any noise above 75 Db is considered needing hearing protection. When you are standing in an area with 75 Db noise, you can talk with someone without trouble hearing them talk. My left ear is the worst. I used ear plugs as required, but that is not enough protection.
Another possible cause is an ear wax build up. This can plug up an ear just like ear plugs. I knew a guy that went to a doctor because of hearing problem. Dr. put some drops in the ear to soften the wax and a few day later, the Dr. pulled out the wax "plug". He said.....wow!!!! I can hear again.
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