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Chronic urticaria and/or angioedema are hives or swelling that lasts more than 6 weeks. The cause is usually harder to find than in acute cases. The causes can be similar to those of acute urticaria but can also include your immune system, chronic infections, hormonal disorders, and tumors.
How long do hives last? 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.