There is a lot of possibilities here. I would strongly recommend that you take him to see an ENT specialist, who could help you with a diagnosis and some future planning. If you don't know any specialists in your area, please e-mail me at email@example.com and i will refer you. He will also need to go for a full hearing evaluation with an audiologist after he has been to see the ENT.
Please let me know if you require any further or more specific detail
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