What Is the Most Common Complication of TURP?

Retrograde ejaculation is the most common complication of transurethral resection of the prostate (TURP), affecting more than two-thirds of patients who undergo the procedure.¹ That number surprises many people, because the complications they tend to worry about before surgery, like heavy bleeding or incontinence, happen far less often. Understanding what actually goes wrong after TURP, how frequently, and which problems are temporary versus permanent gives you a much clearer picture of what recovery looks like.

Retrograde Ejaculation and Why It Leads the List

During TURP, prostate tissue is removed from the inside of the gland using a loop that cuts and cauterizes. The procedure opens up the channel through which urine flows, but it also disrupts the bladder neck, the muscular ring that normally closes during orgasm to push semen forward. When that ring no longer seals properly, semen travels backward into the bladder instead of out through the penis. This is retrograde ejaculation, sometimes called “dry orgasm.” It is not painful and does not change the sensation of orgasm for most men, but it does mean little or no fluid comes out. It also makes natural conception essentially impossible, since the sperm end up in the bladder and are passed with urine.

The rates reported in the literature are consistently high. A systematic review and meta-analysis found that retrograde ejaculation affects more than two-thirds of patients after standard TURP.¹ An independent multicenter study confirmed a significant worsening of ejaculatory function scores after the procedure.² In one trial comparing bladder-neck-preserving technique to standard TURP, the standard group had a retrograde ejaculation rate above 74% at one year, while the preservation group came in around 14%.³ That dramatic gap has fueled interest in surgical modifications that spare the area just above the verumontanum (a small anatomical landmark inside the urethra). Those modified techniques can cut the risk of retrograde ejaculation by roughly three-quarters, though they are not yet standard practice everywhere.¹

For men who are done having children or who do not prioritize ejaculatory function, retrograde ejaculation is often described as a tolerable trade-off for dramatically improved urinary flow. For younger men or those who want to preserve fertility, the conversation with a surgeon should include whether an ejaculation-sparing technique or a non-resective alternative is available.

How TURP Affects Erectile Function

Erectile function is the concern men ask about most before surgery, but the evidence is more reassuring than many expect. A retrospective study of 264 patients found that TURP had no negative impact on erections for the large majority. Among men who had good erectile function before surgery, only about 6% reported worsening afterward. Among those with mild to moderate erectile difficulties before the procedure, roughly 16% actually reported improvement, while about 4% worsened.⁴ The improvement likely reflects the relief of urinary symptoms that were interfering with sexual confidence and comfort.

Where things get murkier is in men who stop sexual activity altogether after surgery. In that same study, about 10% of men with pre-existing erectile difficulties simply stopped having sex. Whether that was due to the surgery, aging, partner dynamics, or discouragement about retrograde ejaculation is hard to untangle. The takeaway for most men: if your erections work before TURP, they will probably still work after.

Bleeding After TURP

Bleeding is the complication that gets the most attention in the immediate postoperative period. Visible blood in the urine is expected for the first several days after TURP, and the amount gradually tapers. In one study tracking gross hematuria, it had resolved in about half of patients by the end of the first week, roughly three-quarters by the end of the second, and nearly all by four weeks. The duration was directly tied to how much tissue was removed and how long the operation took.⁵

The more significant bleeding events involve clot retention, where blood clots block the catheter or bladder outlet, requiring a return to hospital. This happens in roughly 6 to 11% of patients in the weeks following surgery.⁶ The switch from monopolar to bipolar TURP (discussed later) has meaningfully reduced the incidence of both clot retention and the need for blood transfusion.⁷

Blood Thinners and Bleeding Risk

If you are on anticoagulant or antiplatelet medication, your bleeding risk after TURP is substantially higher. A meta-analysis found that continuing blood thinners through surgery roughly quadrupled the rate of postoperative bleeding and nearly tripled the transfusion rate compared to stopping them.⁸ A separate study found that patients on anticoagulant therapy faced about 1.6 times the risk of acute bleeding and 11 times the risk of prolonged blood in the urine lasting more than two weeks. Among anticoagulants, rivaroxaban was associated with a higher risk of acute bleeding than apixaban.⁹

The dilemma is real: stopping blood thinners reduces bleeding after surgery but raises the risk of stroke or heart attack. In that same study, the perioperative stroke rate was higher in the anticoagulant group than in patients not on blood thinners.⁹ Managing this balance is one of the trickiest parts of pre-TURP planning and requires close coordination between the urologist and the prescribing physician.

Infections After TURP

Any procedure that introduces instruments into the urinary tract carries infection risk. A large retrospective study of over 1,100 TURP patients found that about 8% developed infections postoperatively, and roughly 4% had multiple infections. The most common culprit was E. coli, followed by Pseudomonas and Enterococcus species.¹⁰ Having bacteria in the urine before surgery was a key risk factor; about 20% of patients had positive urine cultures going in.¹⁰

Most post-TURP infections are straightforward urinary tract infections treatable with antibiotics. Severe complications like urosepsis (a life-threatening bloodstream infection originating from the urinary tract) are uncommon. Readmission for a complicated urinary tract infection was needed in about 2% of patients in one recent study.¹¹

Whether routine antibiotics before surgery actually prevent these infections is less settled than you might think. A randomized trial found that fever occurred at nearly identical rates, around 4 to 5%, regardless of whether patients received antibiotics beforehand. The researchers concluded they could rule out a meaningful increase in harm from skipping prophylaxis.¹² That said, most guidelines still recommend a single prophylactic dose, and men with positive pre-operative urine cultures are typically treated before surgery goes ahead.

Urinary Incontinence

Leaking urine after TURP is common in the short term and rare in the long term. Early urge incontinence, the sudden uncontrollable need to urinate, occurs in up to 30 to 40% of patients in the first weeks after surgery.¹³ This is largely the bladder adjusting to the newly opened channel, and it typically resolves on its own within weeks to a few months.

Persistent stress incontinence, leaking when you cough, sneeze, or strain, is a different story and much less frequent. A systematic review and meta-analysis of comparative studies found that the rate of transient stress incontinence after monopolar TURP was about 3%, with the persistent form running around 1.7%.¹⁴ A large review of TURP complications put the rate of lasting stress incontinence at under 0.5%.¹³ Men with very large prostates or those who have had prior prostate surgery carry higher risk, but for most patients, incontinence is a nuisance in the early recovery period rather than a permanent problem.

TUR Syndrome

TUR syndrome is a potentially serious but increasingly rare complication unique to monopolar TURP. During the procedure, large volumes of irrigation fluid are used to flush away tissue and maintain visibility. With monopolar instruments, the irrigation fluid must be non-conductive (typically a glycine solution), and if enough of it gets absorbed into the bloodstream through open blood vessels in the surgical bed, it dilutes the blood’s sodium levels. The resulting drop in sodium can cause confusion, nausea, visual disturbances, seizures, and in extreme cases coma or death.¹⁵ Animal research confirmed that the sodium drop itself, rather than other biochemical changes in the irrigation fluid, is the primary driver of the syndrome’s worst effects.¹⁶

The shift to bipolar TURP has largely neutralized this risk. Bipolar systems use saline irrigation, which is isotonic, meaning absorbed fluid does not crash sodium levels the same way. A comparative study found three cases of TUR syndrome in the monopolar group and zero in the bipolar group, along with a far smaller average drop in serum sodium.¹⁷ A meta-analysis confirmed that bipolar TURP reduced the risk of TUR syndrome by about 88%.⁷ In hospitals that have fully switched to bipolar equipment, TUR syndrome has essentially vanished from the complication ledger.

Failure to Void After Catheter Removal

One frustrating short-term complication is the inability to urinate after the catheter comes out. Overall, about 12% of men in one older study failed to void on the first attempt, though this varied enormously by how they came into surgery. Men who had been living with chronic urinary retention before TURP had much higher failure rates, in the range of 38 to 44%, while men who came in with typical lower urinary tract symptoms had essentially none.¹⁸ Only about 1% needed long-term catheterization as a result.

A more recent meta-analysis put pooled failure-to-void rates at about 3.7% after monopolar TURP and 3.0% after bipolar TURP, lower than the older figures, probably reflecting improvements in technique and patient selection. Laser ablation techniques actually had higher rates, around 9%, possibly because tissue swelling after ablation temporarily blocks the channel.¹⁹

Late Structural Complications

Weeks to months after TURP, scar tissue can form at two vulnerable points: the bladder neck and the urethra itself. Bladder neck contracture is a progressive narrowing caused by scar tissue where the bladder meets the prostatic channel.²⁰ In a study of over 1,300 TURP patients, about 6% developed a bladder neck contracture that required additional surgery. Counterintuitively, smaller prostates were associated with higher risk, likely because less tissue is removed in those cases, leaving a tighter surgical cavity more prone to scarring. Having bacteria in the urine before surgery was also an independent predictor.²¹

Urethral stricture, a narrowing further downstream along the urethra, developed in about 8% of TURP patients in one matched study, compared to roughly 5% with laser enucleation. Longer operative times and larger prostate volumes raised the risk of both complications.²² When either of these scarring complications occurs, the usual treatment is a brief outpatient procedure to cut through the scar tissue, though recurrence is possible.

Reoperation Rates Over Time

TURP is not always a permanent fix. A systematic review found reoperation rates of about 4% at one year, 5% at two years, 6% at three years, and roughly 8% at five years.²³ An eight-year nationwide analysis put the re-TURP rate at about 8%, with a total endoscopic reintervention rate (including procedures for strictures and contractures) closer to 13%.²⁴ Older men, particularly those over 80, had higher re-TURP rates.

The reasons for reoperation vary. Some men develop regrowth of prostate tissue (the procedure does not remove the entire gland, just the obstructing inner portion). Others need treatment for the scarring complications described above. In one urban academic center, 10% of men underwent a repeat TURP at a mean interval of about two years.²⁵ By comparison, a nationwide study found that laser enucleation of the prostate (HoLEP) had a reoperation rate of only about 1.3%.²⁶ This difference, largely because enucleation removes more tissue, is one reason HoLEP has gained ground for larger prostates.

Monopolar Versus Bipolar TURP

The distinction between monopolar and bipolar TURP matters for several of the complications discussed above. A meta-analysis comparing the two found that bipolar TURP was associated with significantly fewer adverse events, including an 88% lower risk of TUR syndrome, about half the rate of clot retention, and roughly half the rate of blood transfusion. There was no meaningful difference between the two in terms of how well they improved urinary symptoms.⁷ Bipolar systems have become dominant in most high-volume centers, though monopolar equipment remains in use at some institutions, especially in lower-resource settings.

How Newer Alternatives Compare

TURP remains widely used, but a network meta-analysis comparing it to newer minimally invasive options found a predictable trade-off: the resective procedures like TURP and Aquablation produced greater improvement in urinary symptoms, urine flow, and quality of life, while non-resective options like the UroLift prostatic urethral lift preserved sexual function better.²⁷ A randomized trial comparing UroLift to monopolar TURP found better erectile and ejaculatory outcomes in the UroLift group, with no stress incontinence, while about 7% of the TURP group developed some.²⁸

The catch is durability. As the reoperation data suggests, TURP provides a long-lasting result for most men. Some of the newer, less invasive options have higher retreatment rates in the medium term, which is why the choice is not simply “pick the procedure with fewer side effects.” It is a conversation about how much symptom relief you need, how much tissue has to go, and which complications matter most to you.

Cardiovascular Events in High-Risk Patients

TURP is generally classified as a low-risk surgery, but for men with existing heart disease, it is worth knowing that cardiovascular events are more common in this population than in the general surgical population.²⁹ A population-based analysis of nearly 45,000 patients found that about 0.8% experienced a major acute cardiovascular event within 30 days of surgery.³⁰

In a study focused specifically on high-risk cardiac patients undergoing TURP under spinal anesthesia, about 28% experienced intraoperative low blood pressure, 12% had episodes of slow heart rate, and roughly 5% developed new heart rhythm abnormalities after surgery. Non-fatal heart attack occurred in about 1.3%, and 30-day mortality was under 1%.³¹ These numbers reflect a high-risk subset, not the average TURP patient, but they underscore why pre-surgical cardiac evaluation matters for older men with heart conditions.

When Longer Surgery Means More Complications

Operative duration has emerged as a consistent predictor across multiple complication types. A study of nearly 39,000 TURP patients found that operations lasting longer than about an hour were associated with increased healthcare resource use, including longer hospital stays and higher rates of complications. The odds of additional healthcare utilization climbed steadily the longer the surgery ran, with operations over 100 minutes showing about 1.8 times the odds compared to shorter procedures.³² This is one reason surgeons try to limit resection time, and why very large prostates are sometimes better served by enucleation or open surgery rather than a prolonged TURP.