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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.
Individual hives can last anywhere from half an hour to a day and a half. If you touch the hives, it may be painful and you may notice that the area turns slightly white. Sometimes the hives may change shape or form together and create a larger, raised area. Hives can occur in a variety of places on the body.