Heart valve disease occurs if one or more of your heart's four valves do not work well.The symptoms of heart valve disease are commonly misunderstood by patients as normal signs of aging.Know about the symptoms, causes and how is heart valve disease diagnosed. Understand the risks and explore all the treatment options. Get a free info kit to understand your heart better which includes the following resources: Heart murmur brochure and Aortic stenosis brochure.