A food allergy — commonly to edibles such as shellfish, nuts, wheat, eggs or milk — often has telltale warning signs.
The American Academy of Allergy Asthma and Immunology offers this list of possibilities:
-Skin that itches, turns red or develops a rash.
-Watering, tearing eyes that may also itch.
-Itching or congestion of the nose.
-Diarrhea, abdominal pain, cramping or vomiting.
-Swelling.
Difficulty breathing, wheezing, chest tightness, tingling of the extremities, or constriction of the throat indicate a serious allergic reaction that requires immediate medical attention.