Hemorrhoid surgery carries a very low risk of erectile dysfunction, but it is not zero. The nerves responsible for erections run close to the rectal wall, and certain procedures can potentially affect them. In most cases, any sexual difficulties after hemorrhoid surgery are temporary and related to pain, swelling, or medication rather than permanent nerve damage.
Why the Risk Exists: Nerve Proximity
The parasympathetic nerves that trigger erections sit surprisingly close to the surgical field. Cadaver studies have measured the nearest nerve cells responsible for erections at an average of just 8.1 millimeters deep to the inner surface of the rectal wall. That’s roughly the thickness of a pencil. The submucosal tissue where hemorrhoids develop is less than 1 millimeter thick in many places, which means there isn’t much buffer between the surgical site and those critical nerves.
A second nerve, the pudendal nerve, also plays a role. It branches from the lower spine and eventually becomes the dorsal nerve of the penis, controlling sensation. One of its branches, the inferior rectal nerve, supplies the external anal sphincter and perianal skin, placing it directly in the area where hemorrhoid surgery takes place. The pudendal nerve also controls the muscles involved in maintaining erections and ejaculation, including the bulbospongiosus and ischiocavernosus muscles in the pelvic floor.
How Different Procedures Carry Different Risks
Not all hemorrhoid treatments pose the same level of concern. The type of procedure matters significantly.
Traditional excisional hemorrhoidectomy, where the hemorrhoid tissue is cut away using a scalpel or electrocautery, works below the dentate line, a region dense with sensitive nerve endings. Electrocautery (using heat to cut and seal tissue) can cause thermal injury that extends beyond the visible surgical site. When the procedure creates tight, thin layers of remaining tissue in the anal canal, it can affect nearby nerve endings. That said, a preliminary study of 82 men who underwent this type of surgery found that only about 2.4% experienced late loss of anal sensation, and the study actually observed improvements in erectile function scores for many patients after surgery, likely because resolving chronic hemorrhoid pain and pelvic congestion had a positive effect on sexual function overall.
Injection sclerotherapy, a non-surgical treatment where a chemical is injected into hemorrhoid tissue to shrink it, has a more clearly documented link to erectile problems. Because the sclerosant is injected into the submucosal layer, which is on average only 0.6 millimeters from the rectal surface, a misplaced or deep injection can reach the parasympathetic nerves just 8 millimeters away. This specific risk prompted anatomical studies confirming that impotence following sclerotherapy has a plausible physical explanation.
Newer techniques like stapled hemorrhoidopexy and transanal hemorrhoidal dearterialization work higher up in the anal canal, above the dentate line, where there are fewer sensory nerve endings. These approaches generally involve less tissue disruption in the nerve-rich lower anal canal, though large comparative studies specifically measuring erectile function across all procedure types remain limited.
Temporary Causes Are Far More Common
Most sexual difficulties in the weeks following hemorrhoid surgery have nothing to do with nerve damage. Postoperative pain in the anal and perineal region is often severe enough to suppress any interest in sexual activity. Sitting, walking, and bowel movements can be uncomfortable for two to four weeks, and that discomfort radiates through the entire pelvic floor. Pain medications, particularly opioids commonly prescribed after hemorrhoidectomy, are well known to reduce libido and interfere with erections.
Swelling and inflammation in the pelvic region can temporarily affect blood flow patterns. Since erections depend on healthy blood flow, localized vascular disruption during recovery can contribute to difficulties. Anxiety about pain during sexual activity, worry about reopening the surgical site, and general postoperative stress all layer on top of the physical factors. For most men, these issues resolve as the surgical site heals over the course of several weeks.
What Recovery Looks Like
Data from rectal surgery patients provides useful context for understanding timelines, though it’s important to note that major rectal resection is a far more extensive operation than hemorrhoidectomy. In studies of rectal resection patients, sexual activity dropped from 73% preoperatively to 57% at three months, but returned to baseline levels by one year. Among men who developed erectile dysfunction after rectal resection, some experienced persistent problems: 8 out of 32 men still had severe erectile dysfunction at 12 months, and these issues persisted at long-term follow-up roughly 8.5 years later.
Hemorrhoidectomy is a much smaller operation than rectal resection, so the risk of lasting nerve damage is proportionally lower. When nerve injury does occur during any pelvic surgery, partial damage can sometimes recover in the first one to two years as nerves regenerate. Researchers have noted that a long follow-up period of several years is needed to determine whether reduced function is permanent or still improving. If erectile difficulties persist beyond three to six months after hemorrhoid surgery, that’s a reasonable point to seek evaluation from a urologist, because early intervention for erectile dysfunction tends to produce better outcomes regardless of the cause.
Factors That May Increase Your Risk
Certain circumstances can raise the likelihood of nerve-related complications. Repeat operations carry higher risk because scar tissue from previous procedures makes it harder to identify and avoid nerves. Extensive hemorrhoid disease requiring removal of tissue in multiple quadrants of the anal canal increases the surgical footprint and the chance of collateral thermal or mechanical injury. Pre-existing conditions that already compromise nerve health, such as diabetes or peripheral neuropathy, can make nerves more vulnerable to minor surgical trauma that would otherwise be inconsequential.
The surgeon’s experience and technique also matter. Careful use of electrocautery, avoiding unnecessarily deep dissection, and preserving as much healthy tissue as possible all reduce the chance of nerve damage. If you’re concerned about this risk before surgery, it’s reasonable to ask your surgeon about the specific technique they plan to use and whether a less invasive approach might be appropriate for your grade of hemorrhoids.