Primary care doctors, such as internists and family doctors, may treat people who have mild P.A.D. For more advanced P.A.D., a vascular specialist may be involved. This is a doctor who specializes in treating blood vessel diseases and conditions. A cardiologist also may be involved in treating people who have P.A.D. Cardiologists treat heart problems, such as coronary artery disease and heart attack, which often affect people who have P.A.D.