Version October 2024
| Finding | Cause |
| Rapid onset | Psychogenic |
| Genitourinary trauma (eg, radical prostatectomy) | |
| Nonsustained erection | Anxiety |
| Venous leak | |
| Depression or use of certain drugs | Depression |
| Drug induced | |
| Complete loss of nocturnal erections | Vascular disease |
| Neurologic disease |
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