If eating fish, shellfish, sushi, or seafood-based sauces leaves you bloated, nauseous, itchy, fatigued, or experiencing stomach discomfort, you may have a **delayed IgG food sensitivity**, not an allergy. Unlike classic seafood allergies, these reactions appear hours—or even days—after consumption.
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Fish and seafood intolerance is typically caused by a delayed immune response (IgG), not the fast IgE response seen in seafood allergies. With sensitivities, symptoms may appear **8–72 hours later**, making it difficult to identify the real trigger food.
Seafood contains proteins, amines, and bioactive compounds that can trigger gut inflammation in sensitive individuals. Symptoms often overlap with reactions to gluten, dairy, or yeast.
Pinnertest checks IgG reactions to over 200 foods, including many fish and seafood items. Your results show which foods trigger your immune system so you can adjust your diet accordingly.
Learn how the testing process works: How IgG Testing Works.
Comparing different tests? Visit Best Food Sensitivity Test 2025 and Food Sensitivity Test Cost.
If seafood leaves you uncomfortable, consider removing it temporarily while tracking your symptoms. A break from triggers can reduce inflammation and restore gut balance.
Common seafood sources to temporarily avoid:
Possible alternatives:
After removing triggers, see: Best Foods to Eat After Removing Trigger Foods
No. Seafood allergies are IgE-mediated and fast-acting (hives, swelling, anaphylaxis). Seafood intolerance is IgG-mediated and delayed, usually causing digestive, skin, or fatigue symptoms. Learn more: What Is Food Sensitivity?
Yes — fish and several seafood items are included in the Pinnertest panel. Your report will show your reaction level (low, moderate, high) and help guide your elimination plan.
Many elimination plans suggest 60–90 days before a gradual reintroduction. See: How Long to Feel Better After Eliminating Foods .