What is Erectile Dysfunction?

Erectile dysfunction (ED) 

Is a common condition in which a man has difficulty achieving or maintaining an erection firm enough for sexual intercourse. It is sometimes referred to as impotence, though this term is less commonly used now.

How Erections Work

An erection is the result of increased blood flow to the penis, which is triggered by either sexual arousal or physical stimulation. This process involves:

Signals from the brain and nerves.The relaxation of muscles in the penis.Increased blood flow into the spongy tissue of the penis. When any part of this process is disrupted, ED can occur.