Sea animals or seafood contain lots of protein that can meet the body's nutritional needs. However, this type of food can trigger allergic reactions in some people. Seafood allergic reactions can occur ranging from mild, to very serious and require immediate medical help. Although most allergies begin in childhood, seafood allergies can also occur in adulthood. In fact, there is a possibility that can arise suddenly after eating certain seafood that did not cause allergies. This allergic reaction usually appears within minutes or hours after eating seafood. Signs of Seafood Allergies Seafood allergy is an abnormal or excessive reaction of the immune system to proteins contained in certain seafood. These allergic symptoms can include: The skin feels itchy and dry (eczema). Stomach ache, diarrhea, nausea, and vomiting. Nasal congestion, wheezing, and shortness of breath. Swelling in the lips, face, tongue and throat. The head feels dizzy, even fainting. In certain condit