Anaphylaxis is an extremely severe allergic reaction.
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Anaphylaxis is a severe, potentially life-threatening allergic reaction that needs to be treated right away. It can occur within seconds or minutes of exposure to something you're allergic to, such as peanuts or bee stings. It typically causes more than one of the following: an itchy rash, throat or tongue swelling, shortness of breath, vomiting, lightheadedness, and low blood pressure.