What are causes of aortic valve stenosis?

Multiple: Perhaps the most common offending etiology in aortic stenosis in the us is atherosclerosis. Just as this can affect the arteries in the body, it can affect the tissues covering the aortic valve and then the plaque deposition and calcific degeneration of the valve leads to its problems. Rheumatic heart disease, not common in the us, is another common cause in third world countries.

See below: Most common causes are congenital(born with it) and degenerative ( result of aging). High blood pressure and high cholesterol probably accelerate the process.