Aortic stenosis is one of the most common and serious valve disease problems which occurs Narrowing of the valve in the large blood vessel branching off the heart. Due to narrowing of the valve blood flow to the body is reduced and making the heart work harder. The heart may weaken, causing chest pain, fatigue and shortness of breath. Mild cases may not need treatment. In severe cases, surgery can repair or replace the valve. The most common cause of aortic stenosis is the accumulation of calcium deposits on the aortic valve, which increases with age. This causes the aortic valve to stiffen and narrowing of the blood vessel.