The first component you need to achieve an erection is a normal, intact male sexual organ. Secondly, a normal amount of circulating hormones is necessary. Third, a man must have an intact nerve supply and blood flow to the male sex organ. Finally, normal erections require a healthy psychological response to the arousing stimuli, coupled with a relaxed state of mind. Impotence is almost always treatable, a resounding majority of patients will respond to one of the available treatments.
Impotence is an extremely common condition and is very treatable.
Please check with your doctor to explore treatment options. Any neurological disorder which interrupts the nerve supply to the erectile tissues will generally cause an erectile failure. There is little known about the nerves which cause erection and therefore it is difficult to predict how damage to certain nerves will affect erectile capacity. If the blood flow to the genitals is halted or impeded, then erectile failure may occur. The blood that normally rushes to the penis is partially stopped.