Reviewed by Bruce J. Lanser, MD, MPH

Food allergies may cause many different allergy symptoms. Allergic reactions to food usually occur rapidly after eating the offensive food, usually within 30 minutes and almost always within 2 hours of ingestion. Signs and symptoms of food allergy can involve the nose, mouth, stomach, skin, lungs and heart.

  • Skin Symptoms: Include itching, flushing (redness), hives and swelling.

  • Oral/Stomach Symptoms: Include itching, tingling, burning, abdominal cramping, nausea, vomiting and diarrhea.

  • Respiratory Symptoms: Include nasal congestion, runny nose, sneezing, throat swelling, wheezing and/or difficulty breathing.

  • Life-threatening, anaphylactic reactions: Include loss of consciousness and stopped breathing. Call 911 immediately if you suspect anaphylaxis.

  • Cardiovascular Symptoms: Include lightheadedness, fainting, low blood pressure and shock.

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