ASCIA Education Resources (AER) Patient Information
During an allergic reaction to food, irritant chemicals (such as histamine) are released into the tissues. This can result in itchy rashes, stomach upset, cough and wheeze and the more severe symptoms of anaphylaxis. These reactions are due to allergy, which is an immune system reaction to foods. When people complain of symptoms such as headaches, bloating or mouth ulcers after eating, they are describing food intolerance, rather than food allergy.