What are the symptoms of anaphylaxis?

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Symptoms & signs of anaphylaxis include

  • Tight or constricted breathing
  • Swelling of the tongue
  • Difficulty speaking and sometimes a hoarse voice
  • Swelling or tightness in the throat
  • Rapid heart rate and low blood pressure
  • Loss of consciousness/collapse
  • Pale appearance and floppiness in small children or babies

Sometimes there may be milder signs of allergy before the above symptoms start, which can include:

  • A tingling sensation around the lips or mouth.
  • Hives or welts
  • Abdominal pain and vomiting (although these are viewed as signs of anaphylaxis in the case of insect allergy)

In around 1 in 5 cases, there may be a second bout of anaphylaxis within 12 hours of the first. This is called biphasic anaphylaxis.

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