When we think about allergies, many people assume they begin in childhood; but shellfish allergies often develop in adulthood, making them one of the most overlooked health risks, especially in areas where seafood is a staple.

An allergy occurs when the immune system reacts to a substance (called an allergen) as if it were harmful. With food allergies, that reaction can escalate quickly and, in some cases, become life-threatening.

Among all food allergies, shellfish is the most common in adults and the most common amongst children, followed by peanuts and tree nuts.