Your heart has four valves, that open and shut like doors, to help pump blood through your body. One of the four valves is called the aortic valve. The tissue from the valve, that opens and shuts like doors, are called leaflets. These leaflets can become stiff. The stiffness causes the opening of the valve to become smaller. This means the valve cannot fully open and shut like it should. As the opening becomes smaller, it makes it harder for the heart to pump blood, which can affect your health. This condition is called aortic stenosis.
Aortic stenosis is a progressive disease, which means it will get worse over time. Because of this, doctors will typically measure it as mild, moderate, or severe aortic stenosis. The stage of aortic stenosis depends on how damaged your aortic valve is. Severe aortic stenosis is the advanced case of aortic stenosis.
Disease progression in the valve leaflets in aortic stenosis