Kawasaki disease is an illness that affects young children. It causes irritation and swelling of the skin, mouth, and lymph nodes. More serious illness can also lead to swelling in the coronary arteries. These arteries supply oxygen to the heart. The swelling can cause serious heart problems like a weakening of blood vessel walls ( aneurysm) and heart attack.

Coronary Arteries
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The cause of Kawasaki disease is unknown. Some believe it is an infectious agent like a virus. However, Kawasaki does not seem to be contagious. It does not spread through households like the flu.