Erection problems may be caused by physical problems
related to the blood vessels, nerves, and hormones. Or they may be caused by psychological issues.
Normally, an erection
occurs when your imagination or senses (vision, hearing, touch, smell, taste)
are stimulated and you become aroused. Your central nervous system sends nerve
impulses that increase blood flow to your penis.
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 hard (so to speak) to figure out why. But these answers should help.
The use of tobacco, alcohol, or illegal drugs. Stopping or reducing the use of these substances may make the erection problem less severe.
Problems with the blood vessels. These problems may prevent blood from filling the penis or from staying
there long enough to maintain an erection. For example, long-term
high blood pressure can cause damage to blood vessels
and lead to erection problems.
Problems with the nerves (neurologic
problems). These may prevent arousal signals from traveling from the brain and spinal
cord to the penis.