SOUNDS SUITABLY MANLY: “Shockwave Therapy” for Erectile Dysfunction. “Campbell explained that, during a normal erection, the penis fills with blood. However, illnesses like diabetes or other blood vessel diseases can often lead to a buildup of scar tissue that decreases blood supply to the area. However, shockwave therapy may help increase the flow of blood to the penis, possibly by promoting the growth of stem cells, which can proliferate into different types of cells such as blood vessels, Campbell said.”