Here is a complete list of circulatory system diseases. What are Circulatory diseases?These circulatory diseases are illnesses that affect the heart and blood vessels of your body. Circulatory conditions can affect your veins, arteries, blood flow, and blood pressure. All of these circulatory system disorders are dangerous and should be diagnosed and treated by a doctor or physician immediately. What diseases affect the circulatory system? If any of these symptoms describe how you are feeling you should go to see a doctor as soon as possible. If you want to see some more diseases see the ischaemic heart disease list. For a list of more likely illnesses see the common illnesses list. What are the worst circulatory diseases? For information on neurological illnesses see the disease list.