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The hives may go away leaving a bruise on the skin, and individual hives may last more than 24 hours.In such cases, the cause may be inflammation of the blood vessels (vasculitis). In some cases, the cause is obvious — a person eats peanuts or shrimp, and then develops hives within a short time.An episode of hives may last from a few minutes to several hours to several days to several weeks.Each individual welt should last no more than 24 hours. Acute episodes of urticaria last for six weeks or less.Most often, the rash is linear, following the path taken by the act of scratching.Delayed pressure urticaria is swelling that appears on areas of constant pressure from belts and constricting clothing such as sock bands.
Foods such as eggs, nuts and shellfish are common causes of urticaria.
Sun-induced urticaria may occur within a few minutes after exposure to the sun.
Certain types of chronic hives are more painful than itchy.
Cold urticaria (from exposure to low temperature followed by re-warming) can be severe and life threatening if there is a generalized body cooling, for example after a plunge into a swimming pool.
Cholinergic urticaria is due to an increase in body temperature with sweating, exercise, hot showers and/or anxiety.
For uncomplicated urticaria, your physician will evaluate for possible causes.