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How to Respond to an Allergic Reaction and Anaphylaxis

Allergic reactions range from mild (hives, sneezing) to life-threatening (anaphylaxis — a severe, systemic reaction that can cause death within minutes). Approximately 1.6–5.1% of Americans are at ris...

DM

Dr. Michael Thompson

Neurologist

|
5 min read
|May 1, 2026
Medically reviewed by Dr. Michael Thompson · Editorial Policy

Allergic reactions range from mild (hives, sneezing) to life-threatening (anaphylaxis — a severe, systemic reaction that can cause death within minutes). Approximately 1.6–5.1% of Americans are at risk for anaphylaxis — from foods, medications, insect venom, or latex — and approximately 1,500 deaths from anaphylaxis occur annually in the United States. Recognizing the difference between a mild allergic reaction and anaphylaxis, and knowing that epinephrine is the only effective immediate treatment, is potentially life-saving knowledge.

The Spectrum Of Allergic Reactions

Mild To Moderate Allergic Reactions

Involve the skin and/or upper respiratory tract without systemic effects:

  • Hives (urticaria): Raised, itchy, red wheals on the skin
  • Angioedema: Localized swelling, typically around the eyes, lips, face, and hands
  • Nasal congestion, sneezing, runny nose
  • Redness and itching of the eyes (allergic conjunctivitis)
  • Localized contact dermatitis (rash at the site of exposure)
  • Mild itching of the throat or mouth (oral allergy syndrome — typically from fresh fruits and vegetables in people with pollen allergy)
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Medical Disclaimer: This article is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of your physician or other qualified health provider with any questions you may have regarding a medical condition.

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Sources & References

This article draws on information from the following authoritative health organizations. Always consult a qualified healthcare professional for personal medical advice.

  1. 1American Academy of Allergy, Asthma and Immunology
  2. 2Food Allergy Research and Education
  3. 3NIH National Institute of Allergy and Infectious Diseases
  4. 4Mayo Clinic: Anaphylaxis
  5. 5CDC: Anaphylaxis
  6. 6American College of Allergy, Asthma and Immunology