Fish

Specific proteins contained in finned fish can induce rashes, itching, stomach discomfort, and congestion in people who have a fish allergy. Fish with fins, including cod, catfish, salmon, and tuna, can trigger allergic reactions in those who have fish allergies. Parvalbumins are one of the particular fish proteins that frequently cause this.

Exposure to these proteins can result in symptoms including hives, itching, stomach discomfort, and congestion in people who have a seafood allergy. Certain species of fish may cause allergies in some people but not others. However, due to the possibility of cross-contamination, those with fish allergies are often recommended to avoid all fish and fish products.