Your heart has four valves: aortic, mitral, tricuspid, and pulmonary. All four of them can develop different kinds of heart valve disease: stenosis, regurgitation (insufficiency), and atresia.
Your valve becomes stiff and has a small opening, which limits your blood flow.
Your valve doesn’t close all the way, letting blood flow back into your heart.
Your valve isn’t formed correctly and is blocked by solid tissue.