- Chronic urticaria and angioedema
- Physical urticaria
Hives, or urticaria, can be acute or chronic. Acute urticaria is the most common type. Symptoms last less than 6 weeks, and they typically affect the face and neck, fingers, toes, and the genitals of males. However, any part of the body can be affected.
Chronic urticaria continues for more than 6 weeks. About 1 in every 1,000 people is estimated to experience chronic urticaria.The exact cause is unknown, but it may link to the immune system.
Viruses can also trigger hives. In some cases, it may relate to an underlying autoimmune disorder, such as thyroid disease or lupus.
Angioedema may also occur. This is similar to hives, but it affects the deeper layers of the skin.