Oral allergy syndrome (OAS) is a well-recognized but little known condition. It is characterized by burning sensation or mouth pain and swelling when people eat specific foods that cross react to pollens which the is allergic to. There are common groups of foods that cluster with esophagus allergy.
On biopsy of such a ringed or felinized appearing esophagus (that is also often narrowed resulting in food sticking) microscopic signs of esophagus allergy are noted. The lining shows a reddish appearing white blood cell. This is characteristic of allergic conditions like histimine are released that trigger swelling and pain.
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