Anaphylaxis is a particular reaction to a particular substance (antigen) in which histamine is released from tissues and causes either local (itching, hives, swelling of the throat, constriction of the bronchioles, etc.) or widespread symptoms (lower blood pressure, unconsciousness, etc.). Symptoms usually appear rapidly, sometimes within minutes, and can be life threatening.  Medical first aid is needed. An injection of adrenaline can save the life.


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