Urticaria (Hives)

Urticaria can be classified as acute (lasting less than 6 weeks) or chronic (lasting more than 6 weeks). Acute urticaria is commonly caused by infections, foods, medications, or insect stings/bites. Chronic urticaria is mainly idiopathic, meaning the cause is unknown. In some people, certain physical stimuli such as heat, cold, exercise, sun exposure, or pressure can induce hives. Treatments include avoiding triggers and/or allergens and the use of antihistamines (either over the counter or by prescription). For severe or recalcitrant cases, oral prednisone and other immune modulating medications may be used.