Our expert says:
It seems as if they tried to exclude most common causes. Did they check for Asthma with a lung function test? Other rare causes could be a thyroid problem or side effects of medication. Does she have difficulty swallowing?
(My dad had a similar thing and after a lot of tests we found that he is allergic to milk!)
See a list of causes in the tables in this article to see if they maybe did not check all possibilities?
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