Hypertrophic cardiomyopathy
This genetic disease causes the heart muscle to grow abnormally thick. Sometimes this leads to problems with blood flow out of the heart. Chest pain and shortness of breath often occur with exercise. Over time, heart failure may occur when the heart muscle becomes very thickened. This makes the heart work harder to pump blood. Along with chest pain, this type of cardiomyopathy may cause dizziness, lightheadedness, fainting, and other symptoms.