You are at the toilet for the third time that night. The stream is a thin trickle. And standing there, you wonder whether this is something serious.
Probably not. An enlarged prostate, medically benign prostatic hyperplasia or BPH, is exactly what that word promises: benign. It is not cancer, it does not turn into cancer, and above the age of fifty roughly half of men have it (Berry, 1984).
But benign does not mean unimportant. And there is one thing almost no page on this topic tells you, even though it can flip how your test result should be read. I will get to that.
What exactly is an enlarged prostate?
An enlarged prostate is benign growth of prostate tissue, usually starting in your forties. The prostate sits like a ring around your urethra. When it grows inward, it squeezes that urethra shut. That explains almost every symptom you have.
The medical names you will run into all mean the same thing. Benign prostatic hyperplasia (BPH), prostatic hypertrophy, benign prostatic enlargement: different words, one condition.
If you want to know where the organ sits and what it does, we covered that separately in where the prostate is and what it does.
Why size says little about your symptoms
This is the part hospital pages mention but never explain. You can have a substantially enlarged prostate without a single complaint. And you can be quite bothered by a prostate that is barely enlarged.
The reason is where the growth happens, not how much of it there is. The tissue that grows in BPH sits in the transition zone, the zone wrapped directly around your urethra. Grow inward and you notice immediately. Grow the same volume outward, toward your pelvis, and you barely notice at all.
Two men with identical prostate volumes can therefore have completely different symptoms. That is not a contradiction. That is anatomy.
How do you recognise an enlarged prostate?
By your urination pattern, not by pain. Together the symptoms are called LUTS (lower urinary tract symptoms) and fall into two groups: trouble voiding (weak stream, hard to get started, dribbling afterwards, a bladder that never feels empty) and going too often (urgency, frequency during the day, and getting up at night).
Pain is not part of the picture. If it hurts when you urinate, or you have pain in your lower abdomen or pelvis, a doctor will think of inflammation before BPH. That is a different story, covered in prostatitis and its symptoms.
The questionnaire your GP also uses (IPSS)
A validated score exists for exactly this problem, and almost nobody publishes it. The IPSS (International Prostate Symptom Score) is a seven-question list, developed and validated by the American Urological Association (Barry, 1992). The Dutch NHG guideline on urinary symptoms in men uses the same approach.
Score each question from 0 (never) to 5 (almost always), over the past month. Add them up. You land somewhere between 0 and 35.
| Question (past month) | Score 0 to 5 |
|---|---|
| Did your bladder feel not empty after urinating? | 0 = never, 5 = almost always. |
| Did you have to go again within two hours? | 0 = never, 5 = almost always. |
| Did your stream stop and start several times? | 0 = never, 5 = almost always. |
| Was it hard to postpone urinating? | 0 = never, 5 = almost always. |
| Was your stream weak? | 0 = never, 5 = almost always. |
| Did you have to push or strain to get started? | 0 = never, 5 = almost always. |
| How often did you get out of bed at night to urinate? | 0 = never, 5 = five times or more. |
What your total means: 0 to 7 is mild, 8 to 19 is moderate, 20 to 35 is severe. This is not a diagnosis and it does not replace your GP. It is, however, exactly the language your GP thinks in, and it turns "I go a bit more often" into a number someone can work with.
Take your score to the appointment. It saves you a consultation full of vague descriptions.
Is an enlarged prostate dangerous?
Fundamentally, no. BPH is benign, it does not raise your prostate cancer risk, and it never turns into cancer. Dutch GP portal Thuisarts.nl puts it bluntly: urinary problems are not a sign of prostate cancer. What can happen is that the outflow narrows enough to cause trouble.
The risks sit in the consequences of obstruction, not in the tissue itself. If urine keeps sitting in your bladder, you can get bladder infections, bladder stones, and in the extreme, back pressure on your kidneys.
The acute version is called urinary retention: suddenly you cannot pass urine at all. It is painful and it is an emergency. That is not a moment for Google, that is a moment for the out-of-hours GP.
Why does your prostate grow in the first place?
Hormones, but not the hormones most men expect. The lead role goes to DHT (dihydrotestosterone), a more potent derivative of testosterone made inside your prostate by the enzyme 5-alpha reductase. DHT drives prostate tissue growth, lifelong.
There is a stubborn misunderstanding here. Many men reason: high testosterone, therefore big prostate. It does not work that way. Your prostate grows with the years, while your testosterone on average declines over those same years.
It is long-term exposure to DHT that counts, not today's testosterone reading. That is also why age is the strongest predictor: 8 percent of men in their thirties have microscopic BPH, against roughly 50 percent of men aged 50 to 60 (Berry, 1984).
To see how DHT and testosterone relate, hair loss in men and DHT explains the same enzyme from an entirely different angle.
How high is your PSA with an enlarged prostate?
Often raised, and that is exactly where things go wrong. An enlarged prostate makes more PSA, simply because there is more prostate tissue. A raised PSA in your case therefore does not necessarily mean cancer. It can just mean your prostate got bigger.
How to read a PSA number and what is usual per age group is in PSA levels by age. That result belongs in a conversation with your GP, not alone on the sofa.
The detail almost nobody tells you: finasteride halves your PSA
If you take finasteride or dutasteride for your prostate (or for hair loss), your PSA drops substantially. By roughly half, an effect known since the 1990s (Guess, 1993). The Dutch Farmacotherapeutisch Kompas states it explicitly for these drugs.
Picture two men of 58, both with a PSA of 2.0 ng/ml on paper. One takes nothing. The other has taken finasteride for two years, so his true value sits nearer 4.0.
Same number on the form. A very different conversation at the GP.
Anyone who does not know this reads a normal result where an abnormal one belonged. So your doctor needs to know you take it. Mention it always, even if you only use it for your hair. It does not show up on your blood tube.
I think that is the single most important sentence in this article.
What can blood work tell you, and what can it not?
Blood work cannot show an enlarged prostate. No blood value says "BPH". What blood does do is map the surroundings: how your kidneys are holding up, whether PSA is raised, and whether your symptoms might come from somewhere else entirely. The diagnosis is made by your GP, using your story and a physical examination.
| Blood value | What it does tell you | What it does not tell you |
|---|---|---|
| PSA. | Whether more prostate tissue is active, whether something needs attention. | Whether that is benign growth or something else. PSA does not make that distinction. |
| Creatinine and eGFR. | Whether long-standing obstruction is starting to strain your kidneys. | How big your prostate is. Kidney values say nothing about the prostate itself. |
| Glucose and HbA1c. | Whether frequent urination comes from high blood sugar instead of your prostate. | Whether you also have BPH. The two do not exclude each other. |
| Testosterone. | Whether hormonal complaints (libido, energy) have a separate explanation. | Whether your prostate is enlarged. Your testosterone level does not predict that. |
That third row matters more than it looks. Frequent urination is a classic symptom of high blood sugar, and in men over fifty it gets blamed on the prostate rather often. More on that in blood sugar in men.
If you want those values together, the prostate health check measures them in a single draw.
Can an enlarged prostate shrink again?
Not on its own. Prostate tissue that exists does not disappear spontaneously. With 5-alpha reductase inhibitors the volume can decrease over months, and there are procedures that remove tissue. But watchful waiting is a legitimate choice with mild symptoms, not a weak one.
The Dutch NHG guideline names it explicitly as an option when the bother is limited. Many men do well with other measures: drinking less in the evening, cutting back coffee and alcohol, and taking their time at the toilet.
Which treatments exist and when a procedure comes into view, we set out in treatment of an enlarged prostate. That choice is made with a doctor, not with a blog.
When should you see your GP?
With blood in your urine, with fever alongside urinary symptoms, and if you cannot urinate at all: the same day. With symptoms that structurally wreck your nights or your days: just book the appointment. And if your IPSS comes out above 7, you have something concrete to start from.
There is another reason to go that few men mention. Urinary symptoms and erectile problems travel together, more strongly than you would expect, and independently of your age or your blood sugar (Rosen, 2003). We work that link out in enlarged prostate and erectile problems.
Two complaints you kept separate turn out to be one conversation.
What it probably is not
Back pain is not part of BPH. Men search for it anyway, which is why prostate symptoms and back pain explains when you should be thinking of something else.
Bowel symptoms get dragged in too. That link does exist, but it runs the opposite way to what most people assume: see enlarged prostate and bowel symptoms.
And if it is mainly at night, your prostate is only one suspect. Heart failure, sleep apnoea and diabetes are on the same list. We untangle that in frequent urination at night.
Where to start today
Take the seven questions above, score yourself honestly, and write the number down. Do it for a week, because one bad night means nothing.
If you do get blood drawn, say whether you take finasteride or dutasteride. That one sentence determines how your PSA must be read.
For the broader context of prostate testing, screening and prevention we have a separate guide: prostate health, screening and prevention.
References
- Berry SJ, Coffey DS, Walsh PC, Ewing LL. The development of human benign prostatic hyperplasia with age. J Urol. 1984;132(3):474-479. PMID 6206240.
- Barry MJ, Fowler FJ Jr, O'Leary MP, et al. The American Urological Association symptom index for benign prostatic hyperplasia. J Urol. 1992;148(5):1549-1557. PMID 1279218.
- Guess HA, Heyse JF, Gormley GJ, Stoner E, Oesterling JE. Effect of finasteride on serum PSA concentration in men with benign prostatic hyperplasia. Urol Clin North Am. 1993;20(4):627-636. PMID 7505970.
- Rosen R, Altwein J, Boyle P, et al. Lower urinary tract symptoms and male sexual dysfunction: the multinational survey of the aging male (MSAM-7). Eur Urol. 2003;44(6):637-649. PMID 14644114.
- NHG. NHG-Standaard Mictieklachten bij mannen. richtlijnen.nhg.org
- Thuisarts.nl. Plasklachten bij mannen. thuisarts.nl
- Farmacotherapeutisch Kompas. Finasteride. farmacotherapeutischkompas.nl
Every blood test result at Caliber includes a professional assessment by a BIG-registered doctor. For treatment decisions, always discuss your results with your GP.
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