Angioedema, also known as angiooedema, Quincke's edema, and angioneurotic edema, is the rapid swelling (edema) of thedermis, subcutaneous tissue, mucosa and submucosal tissues. It is very similar to urticaria, but urticaria, commonly known as hives, occurs in the upper dermis.
Cases where angioedema progresses rapidly should be treated as a medical emergency, as airway obstruction and suffocation can occur. Epinephrine may be life-saving when the cause of angioedema is allergic. In the case of hereditary angioedema, treatment with epinephrine has not been shown to be helpful.
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http://www.aafp.org/afp/2004/0301/p1123.html urticaria and angioedema: a practical approach barbara a. muller, m.d., university of iowa roy j. and lucille a. carver college of medicine, iowa city, iowa am fam physician. 2004 mar 1;69(5):1123-1129.
http://www.hindawi.com/journals/criot/2012/405824/ bassel hallak, propser konu, florian lang, christian simon, and philippe monnier, “acquired form of angioedema of the head and neck related to a deficiency in c1-inhibitor: a case report with a review of the literature,” case reports in otolaryngology, vol. 2012, article id 405824, 3 pages, 2012. doi:10.1155/2012/405824
http://www.hindawi.com/journals/crii/2015/925861/ napoleon patel, lisbet d. suarez, sakshi kapur, and leonard bielory, “hereditary angioedema and gastrointestinal complications: an extensive review of the literature,” case reports in immunology, vol. 2015, article id 925861, 8 pages, 2015. doi:10.1155/2015/925861
panicker r, al duwaisan ar. angioedema - a rare cause of acute episodic dysuria: case report and review of literature. indian j dermatol [serial online] 2007 [cited 2016 jul 29];52:106-8. available from: http://www.e-ijd.org/text.asp?2007/52/2/106/33291