Anaphylaxis
Anaphylaxis is a severe, sometimes life threatening allergic reaction for someone who has had an adverse reaction to an allergen and later is exposed to the same allergen again. Almost any allergen could cause the anaphylaxis condition but most likely allergens are drugs, insect stings, certain foods and even vaccinations. The first exposure to the allergen will not cause severe reactions, but the second could cause the airways in the lungs to tighten up, causing blood pressure to drop; also, the blood vessels may leak which causes swelling and hives. Additionally, it could cause heart problems, severe anxiety and shock.
An injection of epinephrine is the treatment of choice for anaphylaxis. A person who has had an attack of anaphylaxis should always carry a syringe of epinephrine for use in an emergency. Anyone who is experiencing an anaphylaxis attack should quickly report to an emergency department of a hospital to get prompt and expert treatment.