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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.
This, in turn, can cause the weals to form on the surface of your skin. Hives can further be categorized by how long they last. Acute hives last for less than six weeks; chronic hives can last longer. In many cases, a trigger that causes acute hives is not the same as what causes chronic hives. Viral Infections The most common cause of acute hives, particularly in children, is a viral infection such as an upper respiratory infection.