Kawasaki disease, also known as mucocutaneous lymph node syndrome, has unclear etiology and pathogenesis. The primary pathological change is systemic vasculitis, frequently affecting the coronary arteries. Kawasaki disease is considered a self-limiting condition, with most cases having a good prognosis; recurrence occurs in 1% to 2% of affected children. If associated with coronary artery damage and not effectively treated, 15% to 25% of these cases can develop coronary artery aneurysms. Typically, coronary artery aneurysms resolve within two years of onset, but often leave residual arterial wall thickening and reduced elasticity. Large aneurysms do not disappear completely and can lead to thrombosis or stenosis. Kawasaki disease is also one of the main causes of acquired heart disease in children. Therefore, active and effective treatment of Kawasaki disease can result in recovery. However, if there is accompanying coronary artery damage, the prognosis can vary depending on the extent of the damage. Severe coronary artery damage might lead to long-term heart disease.