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Hives Definition. Hives (also called urticaria) is a condition that causes a noticeable skin rash with itchy, raised, pale red bumps. Hives are the result of allergic triggers in most cases. Other names for hives include welts, nettle rash, wheals, heat rash. There are 2 classifications of hives: acute and chronic.
Signs and Symptoms of Hives. The most obvious sign of hives is a raised area of skin called a wheal. In some cases, wheals join together and form a large rash that can eventually covers the whole body. Intense itching is another common symptom of hives. Hive symptoms may worsen with extreme heat, stress, or physical exertion. Hives often occur on the face, hands, and/or feet. Some hives have reddish patches, called flares or halos, that surround the wheals.