How serious is a prostate of 255 grams?
Quick Answer
A prostate weighing about 255 grams is very large. For comparison, the American Urological Association classifies a prostate larger than 150 grams as “very large.”
However, prostate size alone does not tell me how serious your condition is. What matters most is whether the enlarged prostate is obstructing urine flow, preventing the bladder from emptying properly, causing urinary retention, recurrent infections, bladder stones, bleeding, bladder damage or kidney problems.
A prostate of this size deserves proper urological evaluation even if your symptoms seem manageable. If treatment is required, prostate size can also strongly influence which procedures are appropriate.
How Large Is a 255-Gram Prostate?
A prostate of 255 grams is substantially enlarged.
According to the American Urological Association, prostate size can be described approximately as:
| Prostate Size | AUA Size Category |
|---|---|
| Less than 30 g | Small |
| 30–80 g | Average |
| More than 80–150 g | Large |
| More than 150 g | Very large |
| 255 g | Very large |
Prostate volume is often reported in milliliters or cubic centimeters (mL or cc) rather than grams. For clinical treatment planning, these values are close enough that they are often discussed similarly when describing prostate size.
You can learn more about prostate enlargement in my guide to benign prostatic hyperplasia (BPH) .
Does a 255-Gram Prostate Mean the Condition Is Dangerous?
Not necessarily, but it should be taken seriously.
One of the most important things to understand about BPH is that prostate size and symptom severity do not always match.
Some men have a very large prostate but remain able to urinate reasonably well. Other men with much smaller prostates develop significant bladder outlet obstruction.
Therefore, I would not determine severity from the number “255 grams” alone. I would want to know what that prostate is doing to the urinary system.
What Makes a Very Large Prostate More Concerning?
The enlargement becomes more clinically important when it interferes with bladder emptying.
As the prostate obstructs the urethra, the bladder has to work harder to push urine through the narrowed outlet. Over time, some men can develop increasing residual urine or urinary retention.
Possible complications include:
- acute or chronic urinary retention;
- recurrent urinary tract infections;
- bladder stones;
- blood in the urine;
- progressive bladder dysfunction;
- overflow urinary leakage;
- and, in severe cases, kidney damage related to urinary obstruction.
The more useful questions are: Am I emptying my bladder? Is my urine flow obstructed? How much urine remains after I urinate? Are my bladder and kidneys still functioning normally? Have complications developed?
What Symptoms Can a Prostate This Large Cause?
A very enlarged prostate can contribute to lower urinary tract symptoms such as:
- a weak or interrupted urine stream;
- difficulty starting urination;
- straining to urinate;
- a feeling that the bladder has not emptied;
- frequent urination;
- urgency;
- waking repeatedly at night to urinate;
- dribbling after urination;
- and urinary retention.
But again, the number of symptoms does not necessarily correspond directly to the size of the prostate.
Does a 255-Gram Prostate Mean Prostate Cancer?
No. A very large prostate does not by itself mean that you have prostate cancer.
BPH is benign, meaning non-cancerous. It can produce very substantial prostate enlargement.
At the same time, prostate size cannot be used to rule cancer in or out. Cancer risk is assessed separately using factors such as age, medical and family history, examination findings, PSA , PSA changes over time, imaging and, when clinically indicated, further testing.
BPH and prostate cancer are different conditions. A man can have BPH without cancer, cancer without major prostate enlargement, or occasionally both conditions at the same time.
What Tests Are Important With a 255-Gram Prostate?
Evaluation should look beyond prostate size and determine how the urinary system is functioning.
Depending on the individual situation, a clinician or urologist may consider:
- your urinary symptoms and how much they affect daily life;
- digital rectal examination;
- urinalysis;
- PSA testing ;
- measurement of urinary flow rate;
- post-void residual urine measurement to see how much urine remains in the bladder;
- kidney function blood tests when indicated;
- ultrasound or other imaging;
- assessment for bladder stones or urinary tract obstruction;
- and additional prostate-cancer evaluation when clinically appropriate.
See my complete guide to tests used to evaluate prostate and urinary problems .
Can Medicines Treat a Prostate This Large?
Medicines can still have an important role, depending on symptoms, complications and the individual’s overall situation.
Alpha-blockers can improve urinary symptoms by relaxing smooth muscle around the prostate and bladder outlet, but they do not substantially shrink the prostate.
For men with enlarged prostates, 5-alpha-reductase inhibitors such as finasteride or dutasteride can gradually reduce prostate volume and lower the risk of urinary retention and future BPH surgery in appropriately selected patients.
However, a prostate of 255 grams is far beyond the size of an ordinary enlarged gland. Whether medication alone is sufficient depends on symptoms, obstruction, residual urine, complications and the patient’s preferences and health.
Read more in my guide to BPH medications .
Does a 255-Gram Prostate Require Surgery?
Not automatically. The size alone does not create an automatic requirement for surgery.
Surgery becomes more likely to be considered when symptoms remain troublesome despite appropriate treatment or when complications such as recurrent urinary retention, recurrent infections, bladder stones, significant bleeding or upper urinary tract problems occur.
However, prostate size becomes very important when choosing a procedure.
Many traditional transurethral procedures were developed primarily for small-to-moderately enlarged prostates. Current European guidance, for example, describes TURP principally for prostates in the 30–80 mL range.
For substantially larger glands, procedures that remove or enucleate a large amount of obstructing prostate tissue may be considered.
What Procedures Can Be Used for a Very Large Prostate?
The appropriate procedure depends on anatomy, urinary obstruction, overall health, medications, surgical expertise and what technology is available at the treating center.
For very large prostates, options that may be discussed include:
- HoLEP (holmium laser enucleation of the prostate) — an endoscopic technique that enucleates obstructing prostate tissue;
- bipolar transurethral enucleation — another endoscopic enucleation approach;
- robotic or laparoscopic simple prostatectomy in selected patients;
- and open simple prostatectomy where appropriate, particularly when endoscopic enucleation technology or expertise is not available.
The European Association of Urology specifically discusses simple prostatectomy and enucleation techniques for substantially enlarged glands. It also reports clinical experience with HoLEP and robotic simple prostatectomy in prostates exceeding 200 mL.
A procedure that works very well for a 40-gram prostate may not be the preferred approach for a 255-gram gland. This is one reason evaluation by a urologist experienced in treating very large prostates is particularly valuable.
See the detailed BPH surgery guide for an explanation of the different surgical approaches.
What If I Have Few Symptoms?
Having few symptoms is reassuring, but with a prostate reported at 255 grams I would still want objective information about bladder emptying and urinary tract health.
Some men adapt gradually to worsening urinary flow and may not realize that substantial residual urine is remaining in the bladder.
That is why symptoms should be considered together with measurements such as post-void residual urine, urinary flow and, where appropriate, kidney function and imaging.
Dr. Albana’s Perspective
If you told me only that your prostate weighs 255 grams, I would say that it is definitely a very large prostate—but I would not tell you how serious your condition is until I knew more.
I would want to know whether you have a weak stream, difficulty starting, nighttime urination, urgency, recurrent infections or episodes when you could not urinate. I would also want to know how much urine remains in your bladder after you urinate and whether your bladder and kidneys are functioning normally.
I would also review your PSA and the way the prostate size was measured. A 255-gram prostate does not automatically mean cancer, and it does not automatically mean that surgery is required.
However, this degree of enlargement is significant enough that I would recommend proper urological assessment rather than simply watching the number without evaluating its effects.
If surgery becomes necessary, the size of the gland matters considerably. For a prostate this large, the urologist may discuss techniques designed for large-volume glands, such as enucleation or simple prostatectomy, rather than assuming that every standard BPH procedure is equally suitable.
— Dr. Albana Greca, MD, MMedSc
Family Physician / General Practitioner
When a Very Large Prostate Needs Urgent Attention
Seek urgent medical care if you:
- cannot urinate at all;
- develop severe lower abdominal pain with inability to empty your bladder;
- have fever and chills together with painful or difficult urination;
- have significant blood in your urine;
- or become acutely unwell with urinary symptoms.
Acute urinary retention requires prompt treatment. The bladder usually needs to be drained to relieve pressure and reduce the risk of bladder and kidney damage.
Frequently Asked Questions
Is a 255-gram prostate extremely large?
Yes. The American Urological Association describes prostates above 150 grams as very large, so a reported size of 255 grams represents substantial enlargement.
Does a 255-gram prostate mean cancer?
No. BPH can cause very substantial enlargement. Prostate size alone cannot diagnose prostate cancer, so cancer risk must be assessed separately.
Can I have a 255-gram prostate without severe symptoms?
Yes. Prostate size and urinary symptom severity do not always correspond. Some men with large glands have relatively modest symptoms. Objective assessment of bladder emptying remains important.
Can medication shrink a 255-gram prostate?
5-alpha-reductase inhibitors such as finasteride and dutasteride can reduce prostate volume over time in appropriately selected men, but whether medication alone is adequate for such a large prostate depends on obstruction, symptoms, complications and other clinical findings.
Does a prostate this large always need surgery?
No. Surgery is not determined by prostate size alone. Symptoms, urinary obstruction, bladder emptying, complications, treatment response and patient preferences are considered. However, if surgery is needed, a prostate of this size affects which procedures are most suitable.
Can a very large prostate damage the kidneys?
It can if severe urinary obstruction causes significant or prolonged urinary retention. Urine can back up toward the kidneys, potentially causing kidney damage. This is one reason significant retention should not be ignored.
Related Guides
Medical References
-
American Urological Association.
Management of Lower Urinary Tract Symptoms Attributed to Benign
Prostatic Hyperplasia: AUA Guideline.
AUA BPH Guideline -
European Association of Urology.
EAU Guidelines on the Management of Non-neurogenic Male LUTS —
Disease Management.
2026.
EAU Male LUTS Guideline -
National Institute of Diabetes and Digestive and Kidney Diseases.
Enlarged Prostate (Benign Prostatic Hyperplasia).
NIDDK -
National Institute of Diabetes and Digestive and Kidney Diseases.
Urinary Retention.
NIDDK Urinary Retention
Medical information notice: This information is educational and does not determine whether an individual patient needs medication or surgery. Treatment decisions depend on symptoms, bladder function, urinary obstruction, complications, overall health and evaluation by the treating clinician or urologist.
Written & medically reviewed by Dr. Albana Greca, MD, MMedSc • Family Physician / General Practitioner • Last medically reviewed: August 2026