Erectile dysfunction (ED), or impotence, is the inability to get or keep an erection (hard penis) for enough time to have satisfactory sex. To maintain an erection, blood must be able to flow into and stay in the penis until orgasm.
Men commonly have problems with their erections once in a while. If ED occurs often, medical therapy may be helpful.
About 15 to 30 million men in the United States have ED. It can happen at any age, but is more common in men older than 65. Physical problems cause about 70 out of 100 cases (or 70%); emotional issues cause about 10% to 20%; and 10% to 20% have a mixed physical and emotional cause.
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Resource:
The Hormone Foundation
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