American Board of Internal Medicine - Dr. Chastain has been practicing medicine in Bradley County for over 29 years. He was born in Athens, TN, and grew-up in the surrounding area. He graduated from University of Tennessee College of Medicine in 1982 and completed his residency at Duke University Medical Center in Durham, NC. Dr. Chastain is a board-certified physician who specializes in internal medicine, echocardiography, and vascular ultrasound.