Anaphylaxis

Anaphylaxis is a type of allergic reaction that demands immediate medical attention. Symptoms include: unconsciousness, itchy skin, narrowing of the airways and swollen lips or other body parts. It is life threatening and is most commonly seen from allergens such as peanuts, antibiotics and insects stings. Treatments includes adrenaline injected intramuscularly.

References:

http://www.nhs.uk/Conditions/Anaphylaxis/Pages/Introduction.aspx