Thank you for your query.
Well looking into your problem i want to know the age of patient and the various test reports that have been done .In young age anorexia nervosa
can be a cause but we need to rule out other conditions like malignancy , stricture etc.
I advise you to see ENT specialist
for this problem according to the information you provided. If you provide the details i have asked for i will be able to guide you further.
Hope you are satisfied with the answer.
If you have any further queries feel free to ask.
Wish you good health.