ED can be caused by things like stress or fatigue. But a lot of times, ED is not something that you can control. That’s because it’s often due to a physical problem that affects your blood flow.
Usually when a man is sexually aroused:
The brain sends an impulse telling the arteries in the penis to widen.
As a result, more blood flows to the penis.
When this happens, the penis expands and hardens. This causes an erection.
When a man has ED, the nerves or blood vessels in the penis don’t work properly. This prevents blood from flowing to the penis. And that can prevent an erection.
ED is often caused by other health issues that can affect the flow of blood to the penis.
Damage to nerves, arteries, smooth muscles, and fibrous tissues, often as a result of disease, is the most common cause of ED. Diseases such as diabetes, kidney disease, chronic alcoholism, multiple sclerosis, atherosclerosis, vascular disease, and neurologic disease account for about 70 percent of ED cases. Between 35 and 50 percent of men with diabetes experience ED.
Also, surgery (especially radical prostate and bladder surgery for cancer) can injure nerves and arteries near the penis, causing ED. Injury to the penis, spinal cord, prostate, bladder, and pelvis can lead to ED by harming nerves.
In addition, many common medicines blood pressure drugs, antihistamines, antidepressants, tranquilizers, appetite suppressants, and cimetidine (an ulcer drug) can produce ED as a side effect.
Other possible cause is smoking, which affects blood flow in veins and arteries, and hormonal abnormalities, such as not enough testosterone.
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