Kawasaki disease is a disease with unclear pathogenesis and etiology. A major pathological change is systemic vasculitis, which commonly affects the coronary arteries. Typically, it presents with fever lasting from seven to fourteen days or longer, and antibiotics are ineffective in treatment. During the first through sixth weeks of the illness, complications such as pericarditis, myocarditis, endocarditis, and arrhythmias may occur. Coronary artery damage often occurs between the second and fourth weeks of the illness, and proactive and effective treatment of Kawasaki disease can prevent coronary complications. The acute phase generally involves symptomatic supportive care, prevention of platelet aggregation, fever reduction, and prevention of coronary artery damage. Treatment with intravenous immunoglobulin is recommended within the first ten days of onset. If the treatment is not effective, other special medications like steroids may be used, and the treatment duration is generally between two to four weeks. Thus, the pathogenesis of Kawasaki disease is uncertain, and its pathological process is prolonged. The specific timing of discharge depends on the child's condition. If the fever is controlled and no significant coronary artery damage is evident, and the condition is stable, then discharge is possible. However, post-discharge, follow-up should be conducted based on the child's specific condition. Therefore, the duration of hospitalization for Kawasaki disease is not fixed and depends on the child's condition and treatment response.