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A. Hives (urticaria) are raised, red spots on the skin that often itch. Hives are usually indicative of an allergic reaction. Hives are a common reaction in people who have allergies. A number of substances can trigger an outbreak of hives, including foods, medications, pollen, animal dander, or insect bites. Hives can also develop as a result of sun or cold exposure, infections, excessive perspiration, and emotional stress. The reason why stress seems to precipitate an outbreak of hives in many people is not completely understood but is likely related to the known effects of stress on the immune system.
Hives are also known as urticaria, welts, wheals, or nettle rash. It is a red, raised, itchy skin rash that is sometimes triggered by something that produces an allergic reaction-an allergen. When there is an allergic reaction the body releases a protein called histamine.cute urticaria or Acute hives. When symptoms last less than 6 weeks it is called acute urticaria. This is by far the most common type. 25% of people with acute urticaria also have angioedema-swelling in the deeper layers of skin.