Coronary Heart Disease Detailed information on coronary artery disease, including anatomy of the coronary arteries and disease symptoms, diagnostic, and treatment information Atherosclerosis Atherosclerosis is a type of arteriosclerosis caused by a build-up of plaque in the inner lining of an artery. Angina Pectoris Angina pectoris occurs when the heart muscle doesn't receive enough blood and oxygen for a given level of work. Medical Symptoms You Should Never Ignore Some symptoms may indicate the possibility of a serious condition and should be evaluated immediately by a health care provider.