Mild aortic regurgitation refers to the reflux of blood due to incomplete closure of the aortic valve. This disease is most often seen in elderly patients, who have degenerative changes in the valve due to age-related factors and develop insufficiency of closure. However, the majority of patients with long-term rheumatic heart disease cause valve damage, and some patients with infective endocarditis may also have mild regurgitation due to a broken or perforated valve. Congenital valve malformations, which are also a factor in mild regurgitation, are relatively rare. In general, mild reflux, due to low reflux blood, patients generally do not feel any discomfort and can even do various strenuous exercises. When the regurgitation gradually worsens, panic or precordial discomfort may occur, so mild regurgitation is fine as long as it is reviewed regularly. The role of the aortic valve is to ensure unidirectional blood flow, and valve replacement is the best treatment option in terms of treatment.