<unk>  is an acute systemic Type I Hypersensitivity allergic reaction.<unk>  occurs when a person is exposed to a trigger allergen that they have been previously sensitized to.<unk>  can occur through ingestion, skin contact or injection.  The allergen causes a release of mast cells into the circulation.  It is marked by life threatening compromise of airway, breathing and circulation.  Common causes in children are usually food whereas in adults it is usually linked to medications and insect stings.  The mainstay of prevention is to avoid the allergen.  The mainstay of treatment is epinephrine.
Anaphylaxis
Cholinergic urticaria
Laryngospasm
Morning sickness
Rash with fever
Sleep paralysis
Status asthmaticus
Reflux