oral allergy syndrome or PFAS Pollen Food Allergy Syndrome

Some people experience itchiness in their mouth and throat, sometimes with mild swelling, immediately after eating fresh fruit or vegetables. This is known as oral allergy syndrome. Oral allergy syndrome is caused by allergy antibodies mistaking certain proteins in fresh fruits, nuts or vegetables for pollen.

Food allergy - NHS

https://acaai.org/allergies/allergic-conditions/food/pollen-food-allergy-syndrome/