Shellfish & fish

The leading food allergy in adults

Shellfish and fish are part of the big 8 food allergens, as they are one of the most frequent food triggers causing allergic reactions.


Shellfish & fish allergy concerns adults

Shellfish and fish allergies are more common in adults than they are in children. The type of sensitization usually depends on the fish species available to people in different parts of the world.


7DROPS covers a broad spectrum of seafood allergens, including:


  • Cod
  • Herring
  • Mackerel
  • Shrimp
  • Crab
  • Lobster
  • Prawn
  • Oyster
  • Salmon
  • Tuna


Find the full list of seafood allergens covered by 7DROPS here.


Shellfish & fish in food

There are a lot of international foods and dishes that often contain (traces of) shellfish or fish. Here’s a short list:


  • Bouillabaisse (French)
  • Paella (Spanish)
  • Ceviche (Latin American)
  • Scampi (Italian)
  • Jambalaya (South Louisiana)
  • Fish sauce ( often found in Southeast Asian cuisine like Chinese, Japanese, Thai, Vietnamese, and Malaysian)

Shellfish & fish allergy symptoms

An allergic reaction to seafood usually occurs within minutes after exposure or ingestion. Seafood allergy symptoms include:


  • Runny nose and sneezing
  • Skin reactions like hives, redness, or swelling
  • Itching or tingling in or around the mouth and throat
  • Digestive problems like diarrhea, stomach cramps, nausea, or vomiting
  • Tightening of the throat
  • Shortness of breath or wheezing


Seafood allergy can also lead to anaphylaxis, which is a medical emergency that requires immediate treatment with an epinephrine autoinjector, commonly known as an EpiPen.

The right test for you




  • $229
  • -
  • At-home allergy test
  • IgE based
  • Blood collection through finger prick
  • Medical result review
Learn more


  • $229
  • -
  • At-home allergy test
  • IgE based
  • Blood collection through finger prick
  • Medical result review
Learn more

Expert opinion

"There are certain proteins in seafood that commonly trigger food allergy symptoms. In fish, it's usually parvalbumin. In shellfish, it's often tropomyosin. 7DROPS covers these and many more proteins causing allergic reactions to seafood."

  • Dr. Christian Lupinek

    Medical Director, MADx

What 7DROPS users say


Since I have recurring symptoms I couldn’t really make sense of, I purchased a 7DROPS kit for the allergy and food intolerance test. The process was pretty easy and my results came back within a week. I’m happy with the results, as they gave me a lot of insight about different foods I should probably avoid in the future if I want to feel better overall!

Simon P., 39

For years, I experienced skin rashes and nausea whenever I eat certain foods like dairy products. A friend working in the medical field recommended trying 7DROPS to see where I stand – after my results came in, I started cutting out certain allergic foods from my diet and I feel way better now!

Peter M., 35

Originally I only wanted to do an allergy test but after checking the website I thought why not both, and purchased the ALL FIT combination deal. I think it’s super convenient that you can get both results with only one sample, and the report was really comprehensive as well. Recommended if you want to learn more about your health and body!

Martin H.

I suspected I had certain food intolerances or allergies for months after noticing recurring symptoms after eating fruit and seafood. Through taking this at-home test, I found out that my symptoms are a cross-reaction caused by other allergies. It’s way easier to get the right treatment if you know what’s causing your problems!

George G., 53

But what if?


When it comes to seafood, there is a high degree of cross-reactivity among different species. The risk of experiencing allergic reactions to other fish when allergic to another species is about 50%.


Furthermore, there is often cross-reactivity detected between dust mites and crustacean shellfish (e.g. shrimp, lobster, crab).


A 7DROPS allergy test covers all eventualities and will also detect cross-reactivities.