Shellfish are a delicacy for many and a nutritional powerhouse packed with protein, minerals, and omega-3s. But for others, shellfish can pose a serious health risk. Shellfish allergies are among the most common food allergies in adults and can develop at any time, even in individuals who have previously eaten shellfish without issue. We’re passionate about providing quality seafood—and just as passionate about helping our customers stay informed and safe.
Whether you’ve recently been diagnosed or are shopping for someone with an allergy, here’s what you need to know about shellfish allergies, symptoms, and how to stay safe.
What Are Shellfish Allergies?
A shellfish allergy is an immune system reaction to proteins found in certain aquatic animals. Shellfish are generally divided into two groups: crustaceans (such as shrimp, crab, and lobster) and mollusks (such as clams, oysters, mussels, and scallops). Crustacean allergies are more common and tend to cause more severe reactions.
When someone with a shellfish allergy consumes or comes into contact with shellfish proteins, their immune system mistakenly identifies the proteins as harmful and releases chemicals like histamine to fight them off. This immune response can trigger a range of symptoms.
Common Symptoms
Shellfish allergy symptoms can appear within minutes or a few hours after exposure. They can range from mild to severe and may include:
- Hives, itching, or eczema
- Swelling of the lips, face, tongue, or throat
- Nasal congestion or trouble breathing
- Stomach pain, nausea, vomiting, or diarrhea
- Dizziness or fainting
In severe cases, a person may experience anaphylaxis, a life-threatening reaction that requires immediate medical attention. If someone carries an epinephrine auto-injector (like an EpiPen), it should be used immediately if symptoms escalate.
Cross-Contamination Awareness
Even if you’re not eating shellfish, cross-contamination is a real concern. This can happen when shellfish come into contact with other foods, surfaces, or cooking tools. For those with severe allergies, even trace amounts can trigger a reaction.
We prioritize safe handling and storage practices to minimize cross-contamination. Still, we always recommend those with shellfish allergies consult with a healthcare provider before consuming any seafood or visiting fish markets, where airborne particles could also pose a risk.
Reading Labels and Ingredient Lists
Shellfish can appear in surprising places—including sauces, broths, and flavorings. Always read ingredient labels carefully, and when in doubt, call the manufacturer. Be especially careful with:
- Asian cuisines, where shrimp paste or fish sauce is often used
- Worcestershire sauce, which may contain anchovies
- Imitation seafood, which can contain real shellfish extracts
Living with a Shellfish Allergy
Living with a shellfish allergy doesn’t mean giving up delicious food. It just means becoming more aware of what goes on your plate. Here are a few simple tips for managing it:
- Carry emergency medication at all times, especially when dining out.
- Let restaurants know about your allergy ahead of time.
- Prepare meals at home where you can control ingredients and preparation.
- Shop with trusted brands and vendors who prioritize food safety and transparency.
Shellfish Alternatives
If you’re avoiding shellfish but still want to enjoy the flavors of the sea, try these alternatives:
- Fish (like salmon, tilapia, or cod) – if you’re not allergic to finned fish. Check out our fish for sale for the best options available.
- Plant-based seafood alternatives – growing in popularity and often made from seaweed, tofu, or legumes
- Mushrooms or umami-rich vegetables – which can mimic seafood texture and flavor in recipes
Shellfish Allergies: The More You Know
Shellfish allergies can be scary, but with the right knowledge and precautions, they’re manageable. Whether you're avoiding shellfish entirely or just trying to cook safely for a friend or loved one, we're here to make your journey a little easier—one smart, safe, and delicious meal at a time.