[h=1]Erectile dysfunction (ED)[/h] From Wikipedia, the free encyclopedia "Brewer's droop" and "Impotent" redirect here. For the band, see Brewers Droop. For the classification of poverty, see impotent poor. [TABLE="class: infobox, width: 22"] [TR] [TH="bgcolor: lightgrey, colspan: 2, align: center"]Erectile dysfunction[/TH] [/TR] [TR] [TD="colspan: 2, align: center"]Classification and external resources[/TD] [/TR] [TR] [TH="align: left"]ICD-10[/TH] [TD]F52.2, N48.4[/TD] [/TR] [TR] [TH="align: left"]ICD-9[/TH] [TD]302.72, 607.84[/TD] [/TR] [TR] [TH="align: left"]DiseasesDB[/TH] [TD]21555[/TD] [/TR] [TR] [TH="align: left"]eMedicine[/TH] [TD]med/3023[/TD] [/TR] [TR] [TH="align: left"]MeSH[/TH] [TD]D007172[/TD] [/TR] [/TABLE] Erectile dysfunction (ED) or impotence is sexual dysfunction characterized by the inability to develop or maintain an erection of the penis during sexual performance.[SUP][/SUP] A penile erection is the hydraulic effect of blood entering and being retained in sponge-like bodies within the penis. The process is often initiated as a result of sexual arousal, when signals are transmitted from the brain to nerves in the penis. The most important organic causes are cardiovascular disease and diabetes, neurological problems (for example, trauma from prostatectomy surgery), hormonal insufficiencies (hypogonadism) and drug side effects. Psychological impotence is where erection or penetration fails due to thoughts or feelings (psychological reasons) rather than physical impossibility; this is somewhat less frequent but often can be helped. Notably in psychological impotence, there is a strong response to placebo treatment. Erectile dysfunction can have severe psychological consequences as it can be tied to relationship difficulties and masculine self-image generally.