Vascular diseases are those medical conditions that affect the blood vessel of the body which consist of veins and arteries. When arteries carrying oxygen-rich blood and veins carrying blood back to the heart malfunction, it can affect various other parts of the body. Conditions such as hardening or blockage of the arteries can obstruct the flow of blood to any part of the body. Other vascular problems may be congenital or develop after pregnancy or a health issue.