About Hives (Urticaria) and Angioedema
Urticaria (hives) are red or white wheals, usually itchy and transient. Hives can be acute recurrent or chronic recurrent (recurring over 30 days). Angioedema is red or skin-colored, transient swelling of portions of the face – eyelids, lips, or tongue. There are many causes of urticaria such as foods (milk, eggs, wheat, shellfish, nuts, fruits), medications, contact allergens (grass, animal dander, latex, dust, mold), cold temperatures, sun exposure, pressure, autoimmune disease, and other causes. It is often challenging to identify the cause.
