What could be the cause of a child suddenly getting urticaria? Urticaria is a common skin disease, and it is not uncommon for children to suddenly develop urticaria. It may alarm many parents. Urticaria is a skin disease caused by allergic reactions, which may be caused by angioedema, food allergies, etc. The symptoms of urticaria are obvious, red, swollen and granular. They tend to occur in exposed parts of the skin, such as limbs, trunk, etc., and the symptoms recur repeatedly. When a child suddenly develops urticaria, parents should take care of the child immediately