Can't get or keep an erection so you can have sex? That's what doctors call erectile dysfunction, or ED.
If it happens only occasionally, it's not likely to be serious. All men have problems with erections at some time in their lives.
If it slowly but consistently gets worse, there's probably a physical cause. This is generally what happens with chronic impotence.
If it happens suddenly but you're still stiff early in the morning and can get an erection while masturbating, that suggests your mind...
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: