Common diseases that affect the circulatory system include coronary heart disease, atherosclerosis, arteriolosclerosis, arteriosclerosis, hypertension, stroke, aortic dissection, aneurysm, pericarditis, myocarditis, cardiomyopathy, tachycardia, cardiac dysrhythmias, heart valve diseases, acyanotic and cyanotic heart diseases, shock and vasculitis, as listed at Khan Academy. These diseases affect the heart, blood vessels, blood and other tissue fluids.
The circulatory system functions by transporting blood throughout the body via the pumping mechanism of the heart. The onset of circulatory system diseases and disorders can either be influenced by genetic factors or the kind of lifestyle an individual leads. In the United States, the highest mortality rate in both men and women is attributed to cardiovascular diseases, notes WebMD. This group of ailments primarily cause damage to the structure and function of the heart and blood vessels.