Urticaria, also known as hives, is an outbreak of swollen, pale red bumps or plaques (wheals) on the skin that appear suddenly -- either as a result of the body's reaction to certain allergens, or for unknown reasons.

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Skin tests may be performed to determine the substance to which you are allergic. Routine blood tests are done to determine if a system-wide illness is present.

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Urticaria is classified according to its duration.

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Acute urticaria:  (< 6 weeks duration, and often gone within hours to days)

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Chronic urticaria:  (> 6 weeks duration, with daily or episodic weals)

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Hives frequently occur following an infection or as a result of an allergic reaction such as to medication, insect bites,infections, autoimmune conditions or food. Psychological stress, sun & cold temperature, exercise or vibration may also be a trigger. In half of cases the cause remains unknown.

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Prevention is by avoiding whatever it is that causes the condition. Treatment options are oral medications and injections .Patch testing may be useful to determine the allergy.