Since an erection requires a precise sequence of events, ED can occur when any of the events is disrupted. The sequence includes nerve impulses in the brain, spinal column, and area around the penis, and response in muscles, fibrous tissues, veins, and arteries in and near the corpora cavernosa.
Physical Causes
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.
Physical injury to the penis, spinal cord, prostate, bladder or pelvis can also be a factor.
Disease
Conditions such as diabetes, kidney disease, chronic alcoholism, multiple sclerosis and cardiovascular disease account for around 70% of cases of erectile dsyfunction.
Common Medications can cause Male Impotence too
Erectile dsyfunction is also a side effect of some common medications, including blood pressure drugs, antihistamiines, antidepressants and tranquilizers.
Smoking, which affects blood flow, has also been linked to the condition.
Psychological Factors
Psychological factors such as stress, anxiety, guilt, depression, low self-esteem, and fear of sexual failure cause 10 to 20 percent of ED cases. Men with a physical cause for ED frequently experience the same sort of psychological reactions (stress, anxiety, guilt, depression). Other possible causes are smoking, which affects blood flow in veins and arteries, and hormonal abnormalities, such as not enough testosterone.
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