Erectile dysfunction is sometimes more than just an issue that negatively impacts a man's quality of life -- it can also be an early sign of heart or blood vessel problems, according to experts. Consequently, men need to tell their doctors as soon as they develop erectile dysfunction (ED), so their doctors can order additional tests to make sure their heart and blood vessels are healthy, lead author Dr. Kevin Billups of the University of Minnesota School of Medicine in Minneapolis told Reute...