Urticaria may be acute or chronic. As opposed to acute urticaria, chronic urticaria is defined by recurrent episodes occurring at least twice a week for 6 weeks (Grattan, Sabroe, & Greaves ...
Urticaria and angioedema are clinical manifestations of various immunologic and inflammatory mechanisms, or they may be idiopathic. The respiratory and gastrointestinal tracts as well as the ...
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