Understanding Anaphylaxis -- Symptoms

What Are the Symptoms of Anaphylaxis?

Anaphylaxis may begin with severe itching of the eyes or face and, usually within minutes of exposure to the allergen, progressing to the following symptoms:

  • Swelling of the throat, lips, and tongue
  • Difficulty breathing, caused by swelling of the throat and narrowing of the airways
  • Difficulty swallowing
  • Hives
  • Generalized flushing (redness and warmth) of the skin
  • Abdominal cramps and nausea
  • Increased heart rate
  • Sudden weakness
  • Drop in blood pressure
  • Vomiting or diarrhea
  • Swelling throughout the body
  • Shock
  • Unconsciousness

WebMD Medical Reference Reviewed by Sabrina Felson, MD on May 10, 2019



Joint Task Force on Practice Parameters: "The diagnosis and management of anaphylaxis practice parameter: 2010 Update."

American Academy of Allergy, Asthma and Immunology: "Anaphylaxis."

MedlinePlus Medical Encyclopedia: "Anaphylaxis."

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