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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.
Infections causing hives include the common cold, and other viral infections. In most of these cases, when the reason for hives is removed or avoided, the hives resolve. Chronic episodes of urticaria last more than six weeks. In most cases, the cause of chronic hives will not be identified despite testing.