Allergy
According to one study, carrots can cause pollen-related allergic reactions in up to 25% of food-allergic individuals.
Carrot allergy is an example of cross-reactivity in which the proteins in certain fruits or vegetables cause an allergic reaction because of their similarity to the proteins found in certain types of pollen.
If you are sensitive to birch pollen or mugwort pollen, you might react to carrots.
This can cause your mouth to tingle or itch.