How can it be a disease to hear speech and not understand what is being said?

It's not like a foreign language. I have such a disease. just like an eye condition (I also have vision loss). I hear what is being said but I don't understand. What kind of disease is this? I know it's a disease of the brain and nerves, but there is no cure for now.

How can it be a disease to hear speech and not understand what is being said?
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