Anaphylaxis is an emergency condition in which a normally harmless substance which the body treats as harmful causes the body's immune system to trigger a series of severe reactions throughout the body. These reactions may include swelling of the tongue or swelling in other places, a fast heart beat, or nausea. In a severe form of anaphylaxis, known as anaphylactic shock, the heart is unable to pump enough blood around the body for the organs to survive. This is because blood vessels have become much wider, meaning that blood cannot travel as far with each heartbeat. This can be fatal if untreated.

Anaphylaxis Guide Index:

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