Thanks for your response. My husband believes he had this structure ever since he was a child but just recently he had a problem: a piece of food stuck in that narrowing and he was officially diagnosed with it. He never had a surgery or any other medical invasive treatments. He is not even taking medications. Now his doctor wants to do more detailed inspections there under anestesea, and eventually to do dialation. My husband does not want to do any of these procedures and he is trying everything natural and diets etc. Are there any particular herbs or foods you can recomend?