What level of spinal cord injury leads to erectile dysfunction?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Erectile dysfunction after a spinal cord injury most commonly occurs when the damage affects the sacral segments (S2–S4). These lower spinal nerves control the reflex pathway responsible for triggering and maintaining an erection. When this region is injured, the signals between the brain, spinal cord, and pelvic nerves are disrupted, which can lead to difficulty achieving or sustaining an erection.

Because erectile issues can stem from many different causes—neurological, vascular, hormonal, or psychological—identifying the root cause is essential to finding the right treatment. Taking a free, instant, online symptom check can help you better understand what may be driving your symptoms and guide you toward the appropriate next steps with confidence.

Reviewed for medical accuracy: 07/15/2026

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Explanation

Erections depend on two main nerve pathways. One is the reflex pathway that runs through the sacral segments (S2-S4) of the spinal cord. If these segments and the reflex arc are intact, a man may still have reflex erections even if higher pathways are injured.

However, if the injury directly affects these sacral segments or the conus medullaris (where these nerves come together), then the ability to have an erection is often lost. In contrast, injuries higher up in the spinal cord (above T11, for example) might preserve the reflex erection while affecting psychogenic (brain-driven) erections.

In summary, injuries at the S2-S4 level are most strongly associated with causing erectile dysfunction because they interrupt the nerve signals essential for reflex-based erections. The overall impact on erectile function depends on the level and completeness of the injury, so using a free symptom checker can help you understand your specific symptoms before consulting with a specialist for personalized management.

(References)

Shridharani AN, Brant WO. The treatment of erectile dysfunction in patients with neurogenic disease. Transl Androl Urol. 2016 Feb;5(1):88-101. doi: 10.3978/j.issn.2223-4683.2016.01.07. PMID: 26904415; PMCID: PMC4739980.
Sinha V, Elliott S, Ibrahim E, Lynne CM, Brackett NL. Reproductive Health of Men with Spinal Cord Injury. Top Spinal Cord Inj Rehabil. 2017 Winter;23(1):31-41. doi: 10.1310/sci2301-31. PMID: 29339875; PMCID: PMC5340507.
Alexander MS, Aisen CM, Alexander SM, Aisen ML. Sexual concerns after Spinal Cord Injury: An update on management. NeuroRehabilitation. 2017;41(2):343-357. doi: 10.3233/NRE-172202. PMID: 29036845.

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