Doctor.
My uncle had what I think was described as an “Oesophageal web”
You might like to Google or, better still, ask a doctor.
Oesophageal webs or rings are thin, membranous folds of tissue that form in the oesophagus. Health professionals may use both “webs” and “rings” to refer to the same structure. These structures make the oesophagus narrower, blocking it fully or partially. Making swallowing hard or impossible.
(The oesophagus is a tube that joins the mouth and throat to the stomach. ) Webs or rings can form anywhere in the oesophagus, but they’re more common in the upper part of the oesophagus that’s closest to the throat.
Oesophageal webs can make it more difficult to swallow food. In other cases, they don’t cause any noticeable symptoms.