Erectile Dysfunction Basics
Erectile dysfunction, commonly referred to as ED, is the inability to achieve and sustain an erection suitable for sexual intercourse. This condition is not considered normal at any age and is different from other problems that interfere with sexual intercourse, such as lack of sexual desire and problems with ejaculation.

How Common Is ED?
According to the National Institutes of Health, approximately 5 percent of 40-year-old men and between 15 and 25 percent of 65-year-old men experience ED on a long-term basis.

A much more common problem that affects the majority of men at some point in their life is the occasional failure to achieve an erection, which can occur for a variety of reasons, such as from drinking too much alcohol or from being tired.

What Causes ED?
In order to achieve an erection three conditions must occur: The nerves to the penis must be functioning properly; the blood circulation to the penis must be adequate; there must be a stimulus from the brain. If there is something interfering with any or all of these conditions, a full erection will be prevented.

Common causes of ED include diseases that affect blood flow, such as atherosclerosis (hardening of the arteries); nerve diseases, psychological factors, such as stress, depression, and performance anxiety; and injury to the penis. Chronic illness, certain medications and a condition called Peyronie's disease (scar tissue in the penis) can also cause ED.

Can ED Be Prevented?
For people who are at risk of developing ED due to personal behavior, such as drinking too much alcohol, steps may be taken to prevent its occurrence. However, other causes of ED may not be preventable.

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