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Erectile dysfunction (ED), also known as impotence, is a type of sexual dysfunction characterized by the inability to develop or maintain an erection of the penis during sexual activity. ED can have psychological consequences as it can be tied to relationship difficulties and self-image.

A physical cause can be identified in about 80% of cases. These include cardiovascular diseasediabetes mellitus, neurological problems such as following prostatectomyhypogonadism, and drug side effectsPsychological impotence is where erection or penetration fails due to thoughts or feelings; this is somewhat less frequent, in the order of about 10% of cases. In psychological impotence, there is a strong response to placebo treatment.

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