Impotence, or ED, is the inability to get or maintain an erection.
But that’s a simple explanation for a complicated problem. A lot of men don’t realise they’ll probably experience some form of impotence at some point in their lives. It can be very occasional and mild, or permanent and more severe.
Usually, it happens because the blood vessels in the penis become damaged or too constricted. This means blood can’t fill the penis, so it can’t become erect (even when you really need it to).