Pure psychogenic impotence is relatively uncommon. It is characterized objectively by the presence of good nocturnal and morning erections and negative findings on all other tests. However, a psychogenic component is often present in men with organic ED. A history of highly variable erections that can be totally absent one day but virtually normal the next suggests a psychogenic cause. Virtually 100% of men with severe depression have ED.
For more on the presentation of ED, read here.
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