Most cases of urticaria are acute, lasting from a few hours to less than six weeks.
Some cases are chronic, lasting more than six weeks.
Urticaria usually strikes suddenly. First the skin itches, then it erupts into red welts. The itching may be severe, sometimes painful or burning, and can keep people from working or sleeping. Urticaria is not just an allergic disease. Colo. In contrast to urticaria, angioedema is a deeper, subcutaneous swelling, usually in the areas of the face or mucous membranes involving the lips or tongue.