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Oral allergy syndrome, also known as pollen-food syndrome, is an alteration that manifests itself when people who are sensitive to certain pollens experience allergic reactions when consuming some foods. The allergic response is caused by the structural similarity of the proteins in pollens and those in certain foods (fruits, vegetables, and nuts), that is, it involves cross reactions between pollens and foods. The most common symptoms include itching of the mouth, lips and throat, inflammation, erythema and, rarely, difficulty breathing. Furthermore, environmental pollution plays an important role in intensifying allergy symptoms in general and food allergy specifically. Exposure to environmental contaminants (external and internal), allergens, microbes, and diet characterize this part of the exposome. Exposure to toxic fuels, PM, detergents, and other factors favor the deterioration of the intestinal epithelial barrier. As a result, the development and exacerbation of various allergic diseases increases, including food allergies, related to the food we eat, the air we breathe, the clothes we wear and the cleaning products we use, constituting a major problem for human health. planet. [ABSTRACT FROM AUTHOR]