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Hives, also known as urticaria, are itchy, raised welts that are found on the skin. They are usually red, pink, or flesh-colored, and sometimes they sting or hurt. In most cases, hives are caused by an allergic reaction to a medication or food or a reaction to an irritant in the environment.
1 The most common causes are foods, medicines, latex or infections. 2  Insect bites and internal disease may also be responsible. 3  The most common foods that cause hives are nuts, chocolate, fish, tomatoes, eggs, fresh berries, soya, wheat and milk. 4  Fresh foods cause hives more often than cooked foods. Chronic urticaria: Hives or swelling lasting more than six weeks. 2  The cause of this type of hives is usually more difficult to identify than those causing acute urticaria. 3  The causes can be similar to those of acute urticaria but can also include autoimmunity, chronic infections, hormonal disorders and malignancy.