Kawasaki disease is an illness that makes the blood vessels in the body swell and become inflamed. The exact cause of Kawasaki disease is unknown. Because it causes a high fever and swelling of the lymph nodes, Kawasaki disease is thought to be related to an infection. It may occur in children who have a genetic predisposition to the disease. The disease is not contagious.

The symptoms of Kawasaki disease often go away on their own, and the child recovers. Without medical evaluation and treatment however, serious complications may develop and not be initially recognized.

Kawasaki disease more commonly affects children younger than 5 years old, with the majority of children being less than 2 years old. Kawasaki disease, however, can affect older children as well. The disease occurs more often among boys. It is more commonly seen in the winter and spring months.