Rezum is a minimally invasive treatment for urinary symptoms caused by benign prostatic hyperplasia, or BPH. Instead of cutting out prostate tissue, it uses small bursts of steam to damage overgrown tissue that is squeezing the urethra. Over the next several weeks, the body absorbs that treated tissue, and urine can pass more easily.
The main appeal is that Rezum can often be done in an office or outpatient setting, usually with a short procedure time and a lower risk of sexual side effects than some traditional prostate surgeries. The tradeoff is that recovery is not instant. Many men need a temporary catheter, symptoms can flare before they improve, and the best results often take a few months. It is best suited for carefully selected men whose prostate size, symptoms, bladder function, and goals match what the treatment can realistically do.
Table of Contents
- What Rezum Does for an Enlarged Prostate
- Who Is a Good Candidate for Rezum?
- What Happens During the Procedure
- Recovery Timeline After Rezum
- Side Effects and Warning Signs
- Results and How Long They Last
- Rezum vs Other BPH Treatments
- Questions to Ask Before Choosing Rezum
What Rezum Does for an Enlarged Prostate
BPH can narrow the urethra where it passes through the prostate. That narrowing can cause a weak stream, slow starting, stop-and-start urination, nighttime urination, urgency, and the feeling that the bladder does not empty well. Rezum treats the blockage side of the problem by shrinking tissue that presses on the urine channel.
During treatment, a urologist passes a small scope through the urethra. A needle delivers controlled water vapor into targeted areas of the prostate. The steam spreads through the treated tissue, releases heat, and causes cell damage. Over time, the body clears away part of that tissue. The goal is a wider path for urine, not removal of the entire prostate.
This is different from traditional surgery such as TURP, which cuts or shaves prostate tissue away during the operation. It is also different from medications, which usually work only while you keep taking them. Rezum sits between those choices: more active than daily medication, less invasive than many operating-room procedures.
BPH symptoms can overlap with other problems. A man may have an enlarged prostate and still have bladder overactivity, a urinary tract infection, a urethral stricture, diabetes-related bladder changes, prostatitis, or a medication side effect. Treating the prostate helps most when the prostate is truly a major cause of the urinary trouble.
Rezum is not a prostate cancer treatment. It does not replace PSA testing, a prostate exam, MRI, biopsy, or cancer monitoring when those are needed. If PSA is rising, the prostate exam is abnormal, or there is blood in the urine, those issues should be sorted out before choosing a BPH procedure.
Who Is a Good Candidate for Rezum?
Rezum is usually considered for men with bothersome moderate to severe urinary symptoms who want more relief than lifestyle changes or medication have provided, but who also want to avoid more invasive surgery if possible.
A typical candidate has:
- BPH symptoms that affect sleep, work, travel, or daily comfort
- A prostate size that falls in the usual treatment range, often about 30 to 80 cc
- A prostate shape that can be reached and treated safely through the urethra
- A desire to reduce or avoid long-term BPH medication
- Concern about preserving erections and ejaculation
- No active urinary infection at the time of treatment
A urologist may use the International Prostate Symptom Score, often called IPSS, to measure symptom severity. This questionnaire asks about weak stream, urgency, frequency, nighttime urination, straining, intermittency, incomplete emptying, and quality of life. It helps turn vague symptoms into a number that can be tracked before and after treatment.
Prostate size matters because a very small prostate may not be the main cause of obstruction, while a very large prostate may respond less predictably or require a different approach. Some doctors use Rezum outside the classic 30 to 80 cc range in selected cases, but the discussion should be more careful when the gland is large, the patient already has urinary retention, or the bladder is weak.
A median lobe can also matter. The median lobe is a middle section of prostate tissue that can bulge upward into the bladder opening. Rezum can treat some median lobes, which is one reason it may be offered when certain other minimally invasive options are less suitable.
When Rezum may not be the best first choice
A different treatment may be better if there are repeated urinary retention episodes, bladder stones, kidney swelling from obstruction, frequent infections from poor emptying, severe bleeding from the prostate, or a very high amount of urine left in the bladder after voiding. These situations may call for a stronger tissue-removing procedure.
Symptoms also need the right diagnosis. A man who mainly has sudden urgency and frequent small voids may have overactive bladder rather than obstruction. A man whose main issue is feeling unable to empty the bladder may need post-void residual testing, bladder function testing, or imaging before any procedure is chosen.
What Happens During the Procedure
Rezum is commonly done in a urology office, ambulatory surgery center, or hospital outpatient setting. The procedure itself is usually short, but the full visit takes longer because of preparation, anesthesia, observation, and catheter placement.
Before the procedure, the urologist may order or review:
- Urinalysis or urine culture to rule out infection
- PSA history and prostate exam findings
- Prostate size measurement from ultrasound, MRI, CT, or cystoscopy
- Post-void residual, which measures urine left in the bladder after peeing
- Uroflow testing, which measures urine speed
- A medication list, especially blood thinners and drugs that affect urination
Do not stop blood thinners, aspirin, or heart medications without specific instructions from the prescribing clinician and urologist. The plan depends on why the medicine is used and how much bleeding risk the doctor expects.
Anesthesia varies. Some men receive local numbing medicine around the prostate, a numbing gel in the urethra, oral relaxation medicine, inhaled pain control, IV sedation, or a combination. The right setup depends on anxiety level, prostate anatomy, clinic routine, and medical risk.
During the treatment, the urologist inserts a thin instrument through the penis into the urethra. No skin incision is made. The device delivers steam injections into the enlarged areas of the prostate. Each injection lasts only seconds. The number of injections depends on prostate size, side-lobe enlargement, and whether a median lobe is treated.
Most men go home the same day. A catheter is often placed before leaving because the prostate can swell after treatment. The catheter keeps urine draining while the urethra is irritated and swollen.
Men often worry that needing a catheter means something went wrong. After Rezum, catheter use is usually planned. It is part of the recovery strategy, not a sign of failure.
Recovery Timeline After Rezum
Recovery is usually measured in weeks, not days. The procedure may be brief, but the prostate needs time to shrink and heal. Symptoms often improve gradually rather than suddenly.
| Time after procedure | What is common | What to avoid or watch |
|---|---|---|
| First 1–3 days | Catheter, bladder spasms, burning, pelvic pressure, light blood in urine | Heavy lifting, alcohol excess, dehydration, constipation |
| Days 3–10 | Catheter removal for many men; urgency and frequency may continue | Inability to urinate after catheter removal, fever, worsening clots |
| Weeks 2–4 | Burning and urgency usually start settling; stream may begin improving | Rushing back to cycling, heavy workouts, or sex if symptoms flare |
| Weeks 4–12 | More noticeable improvement in stream, nighttime urination, and emptying | Persistent severe symptoms without improvement should be discussed |
| 3–6 months | Many men reach most of their symptom improvement | Ongoing weak stream or high residual may need follow-up testing |
Catheter time varies. Many men need it for several days. Men with a larger prostate, severe baseline symptoms, retention before treatment, or a high post-void residual may need it longer. Some need a second catheter if they cannot urinate after the first removal attempt.
A burning sensation when peeing, urgency, frequent urination, small blood clots, and blood at the start or end of the urine stream can happen during early healing. These symptoms are often worse in the first couple of weeks because the treated prostate tissue swells before it shrinks.
Desk work may be possible within a few days if pain is controlled and the catheter is manageable. Jobs that require lifting, driving for long periods, climbing, or strenuous activity may need more time. Men who receive sedation also need someone to drive them home and should follow the facility’s safety rules for the rest of that day.
Sexual activity is usually paused for a short period after treatment, often around one to two weeks or until the urologist clears it. Ejaculation may feel different at first, and blood in semen can occur during healing. This usually improves, but persistent pain, fever, or heavy bleeding is not normal.
Drinking water helps keep urine moving, but forcing extreme fluids can worsen urgency and nighttime urination. A steady, moderate intake is better than under-drinking all day and then drinking heavily in the evening.
Constipation can make urinary symptoms worse because straining increases pelvic pressure. Stool softeners, fiber, and gentle walking may help if approved by the care team.
Side Effects and Warning Signs
Most side effects are urinary and temporary. They happen because the urethra and prostate are irritated, swollen, and healing.
Common short-term side effects include:
- Burning with urination
- Urgency or frequency
- Blood in the urine
- Pelvic discomfort or pressure
- Bladder spasms
- Urine leakage around the catheter
- Temporary worsening of weak stream
- Blood in semen
- Discomfort with ejaculation
- Urinary tract infection
- Temporary urinary retention
Temporary urinary retention is one of the more important early issues. A man may feel pressure, pain, or a strong urge to urinate but be unable to pass urine. This is urgent, especially after catheter removal. The usual fix is catheter replacement while swelling settles.
Urinary tract infection can also occur. Burning alone does not always mean infection after a prostate procedure, but fever, chills, cloudy foul-smelling urine, worsening pelvic pain, or feeling ill should be reported quickly.
Blood in the urine is common in small amounts. Heavy bleeding is different. Large clots, ketchup-colored urine that does not clear with hydration, dizziness, or a blocked catheter need prompt care.
Call the urologist or seek urgent care for:
- Fever or chills
- Complete inability to urinate
- Catheter not draining
- Severe lower belly pain
- Heavy bleeding or large clots
- New confusion, weakness, or fainting
- Severe testicular pain or swelling
- Worsening symptoms after initial improvement
Longer-term problems are less common but possible. These may include persistent urinary urgency, ongoing weak stream, recurrent infection, urethral narrowing, bladder neck scarring, continued retention, or need for another BPH treatment. Men who had poor bladder muscle function before Rezum may still have emptying problems even if the prostate channel opens.
Sexual side effects are one reason many men ask about Rezum. Compared with TURP and some laser surgeries, Rezum is generally considered more ejaculation-sparing. That does not mean sexual side effects are impossible. Some men notice temporary discomfort, reduced semen volume, or changes in ejaculation. New lasting erectile dysfunction appears uncommon in the main clinical studies, but any procedure around the prostate can affect comfort, confidence, and sexual routine during recovery.
Men already taking BPH medicines may be told to continue them for a while after the procedure. Stopping too early can make the first few weeks harder. The urologist may taper medicines later if symptoms improve enough.
Results and How Long They Last
Rezum usually improves symptoms gradually. Some men notice early changes within a few weeks, but the bigger improvement often comes after two to three months. Tissue remodeling can continue longer.
In clinical studies of selected men, water vapor therapy has produced meaningful improvement in symptom scores, quality of life, and urine flow. Five-year data from the main randomized trial showed durable improvement for many men and a low surgical retreatment rate in that study group. Real-world results can vary because everyday patients may have larger prostates, urinary retention, other bladder problems, more medical conditions, or different follow-up patterns.
A good result may look like:
- A stronger stream
- Less waiting to start urination
- Fewer stop-and-start episodes
- Less nighttime urination
- Less urgency
- Less feeling of incomplete emptying
- Lower need for BPH medication
- Better confidence when traveling or sleeping away from home
Not every symptom improves equally. Nighttime urination can be caused by BPH, but it can also come from sleep apnea, evening fluids, leg swelling, diabetes, alcohol, diuretics, or overactive bladder. A man may have a better stream after Rezum but still wake up at night if nocturia has another cause. Men whose main issue is frequent urination at night should ask whether the pattern truly points to prostate blockage.
A weak stream is more likely to improve when obstruction is the main driver. But weak urine flow can also come from urethral narrowing, poor bladder contraction, neurologic disease, or certain medications. Testing before treatment helps reduce the chance of picking the wrong procedure.
Some men eventually need another BPH treatment. Retreatment may mean repeating Rezum, restarting medication, choosing TURP, HoLEP, aquablation, or another procedure. Retreatment is not always a failure of the first procedure; it can reflect prostate regrowth, under-treated anatomy, aging bladder function, or a first choice that favored lower invasiveness over maximum tissue removal.
Rezum vs Other BPH Treatments
The best BPH treatment depends on symptom severity, prostate size, prostate shape, bladder function, medication tolerance, sexual priorities, anesthesia risk, and how much durability a man wants.
| Option | How it works | Where it may fit best | Main tradeoffs |
|---|---|---|---|
| Lifestyle changes | Adjust fluids, caffeine, alcohol, constipation, timing of diuretics | Mild symptoms or as an add-on to treatment | May not relieve true obstruction |
| Alpha blockers | Relax prostate and bladder neck muscle | Quick medication trial for bothersome symptoms | Dizziness, low blood pressure, ejaculation changes |
| 5-alpha reductase inhibitors | Shrink prostate over months by changing hormone signaling in the gland | Larger prostates, especially when avoiding procedures | Slow onset, libido or ejaculation side effects in some men |
| Daily tadalafil | Can improve urinary symptoms and erectile function in some men | Men with both BPH symptoms and ED concerns | Not safe with nitrates; may cause headache, flushing, reflux |
| Rezum | Steam damages excess prostate tissue so the body can absorb it | Men wanting a minimally invasive option with ejaculation preservation as a priority | Catheter, delayed improvement, temporary urinary flare, possible retreatment |
| UroLift | Implants hold prostate tissue away from the urethra | Selected men who want fast recovery and sexual function preservation | May be less suitable for some prostate shapes; retreatment can occur |
| TURP | Removes obstructing tissue through the urethra | Men needing stronger, time-tested symptom relief | Higher risk of retrograde ejaculation, bleeding, anesthesia, hospital-based care |
| HoLEP | Laser enucleation removes a large amount of obstructing tissue | Large prostates or men needing durable tissue removal | Specialized procedure, temporary leakage risk, ejaculation changes common |
Medication may be the simplest first step. Alpha blockers can work within days, while finasteride or dutasteride may take months and are more useful when the prostate is enlarged. Men comparing procedure options often benefit from understanding finasteride for BPH and how it differs from a tissue procedure.
Daily tadalafil is another option when urinary symptoms and erectile dysfunction overlap. It does not shrink the prostate the way a tissue treatment does, but daily tadalafil for BPH can be a reasonable discussion for men who can take it safely.
UroLift and Rezum are often compared because both aim to preserve sexual function and reduce recovery burden. UroLift uses implants. Rezum uses thermal tissue treatment. UroLift may offer faster symptom improvement for some men, while Rezum can be useful for selected median lobes and does not leave permanent implants. Anatomy often decides which one fits better.
TURP remains a common benchmark because it has a long track record and strong symptom relief. Men choosing between Rezum and TURP surgery for BPH are usually balancing invasiveness, recovery, ejaculation risk, and durability.
HoLEP is often considered when the prostate is large or when a more complete tissue-removing procedure is needed. Compared with Rezum, HoLEP for an enlarged prostate is more invasive but can be more definitive for large glands and severe obstruction.
Questions to Ask Before Choosing Rezum
A good Rezum discussion should be specific to your prostate and bladder, not just the name of the procedure. Two men with the same symptom score can need different treatments because their anatomy and bladder function differ.
Ask the urologist:
- What is my prostate size?
- Do I have a median lobe?
- How much urine is left in my bladder after I pee?
- Does my urine flow test suggest true obstruction?
- Could my symptoms be from overactive bladder, infection, medication, diabetes, or sleep apnea?
- How long will I likely need a catheter?
- What symptoms are expected during the first two weeks?
- When should I call after catheter removal?
- Should I keep taking tamsulosin, tadalafil, finasteride, or other BPH medicines after the procedure?
- What level of improvement is realistic for my case?
- What is the chance I will need another procedure later?
- If Rezum does not work well enough, what would be the next option?
Men with high PSA, an abnormal prostate exam, or a strong family history of prostate cancer should ask whether cancer evaluation needs to happen first. A procedure for BPH can improve urine flow but does not answer every prostate-risk question. If PSA is unexpectedly elevated, the usual next steps may include repeat testing, imaging, or referral decisions; understanding what happens after a high PSA can make that conversation less confusing.
The clearest choice usually comes from matching the treatment to the main goal. If the top goal is avoiding daily medication and preserving ejaculation, Rezum may be appealing. If the top goal is the strongest possible opening of the channel, TURP, HoLEP, or another tissue-removing option may fit better. If the main issue is urgency without obstruction, bladder-focused treatment may make more sense than a prostate procedure.
Rezum is not a shortcut around evaluation. It works best when the symptoms, tests, and anatomy point in the same direction: prostate tissue is blocking urine flow, the bladder can still contract well enough, and the patient accepts a few weeks of recovery for a chance at longer-term symptom relief.
References
- Management of Lower Urinary Tract Symptoms Attributed to Benign Prostatic Hyperplasia: AUA Guideline (2026) Part III: Procedural/Surgical Management 2026 (Guideline)
- EAU Guidelines on Non-Neurogenic Male Lower Urinary Tract Symptoms (LUTS) 2026 (Guideline)
- Final 5-Year Outcomes of the Multicenter Randomized Sham-Controlled Trial of a Water Vapor Thermal Therapy for Treatment of Moderate to Severe Lower Urinary Tract Symptoms Secondary to Benign Prostatic Hyperplasia 2021 (RCT)
- Prospective Trial of Water Vapor Thermal Therapy for Treatment of Lower Urinary Tract Symptoms Due to Benign Prostatic Hyperplasia in Subjects with a Large Prostate: 6- and 12-mo Outcomes 2023 (Prospective Trial)
- Efficacy and safety of Water Vapor Thermal Therapy in the treatment of benign prostate hyperplasia: a systematic review and single-arm Meta-analysis 2023 (Systematic Review)
- Rezum for treating lower urinary tract symptoms secondary to benign prostatic hyperplasia 2020 (Guidance)
Disclaimer
This article is educational and should not replace care from a qualified clinician. BPH symptoms, urinary retention, blood in the urine, infection symptoms, abnormal PSA results, and treatment choices should be discussed with a urologist or other licensed healthcare professional. Recovery instructions can vary based on prostate size, medications, anesthesia, catheter plan, and medical history.
