Like the stock market and foreign car engines, erections are mysterious things that seem to have a mind of their own. When they don't happen, it can be disappointing, at the very least.
Decreased blood flow, typically because vessels that supply blood to the penis have narrowed, is often the cause of erectile dysfunction (ED) in older men. Emotional issues are more commonly at the root of it for younger men.
Regardless of the reasons, it's important to look for answers.
Usually, a vascular disease happens when cholesterol and other substances build up and block blood vessels. In some men, the arteries and veins in the penis, and the rest of the body, may not work properly. They may keep blood from flowing when they're not supposed to.
Some common health conditions are linked with vascular disease and clogged arteries: