Prostate health after 50: what New Zealand men need to know

The prostate is a small gland most men never think about — until, somewhere in their 50s, it starts making itself known. A weaker stream, needing to go more often, getting up in the night. It’s one of the most common things men ask their GP about, and also one of the most misunderstood.

I’m Dr Roderick Mulgan, an Auckland GP and the founder of Lifeguard Health. This is a straight guide to prostate health for New Zealand men over 50: what actually changes, how to tell everyday enlargement from something that needs attention, the truth about PSA testing, and where supplements do and don’t help. It sits alongside our wider men’s health guide for over-45s.

What the prostate does, and why it changes

The prostate sits just below the bladder and surrounds the tube that carries urine out of the body. Its job is to help make semen. Because it wraps around that tube, anything that makes it grow can squeeze the flow — which is why prostate changes show up as urinary symptoms rather than anything you’d feel in the gland itself.

From around the 40s and 50s, the prostate tends to enlarge slowly under normal hormonal influences. This is called benign prostatic hyperplasia (BPH) — “benign” meaning not cancer. It’s so common that most men will experience some degree of it if they live long enough. It isn’t dangerous in itself, but it can be a nuisance, and occasionally it needs treatment to keep the bladder working properly.

Benign enlargement or something more?

Here’s the important part: you cannot tell benign enlargement from prostate cancer by symptoms alone. They can feel identical, and in fact early prostate cancer often causes no symptoms at all. That’s exactly why the sensible move is a conversation with your GP rather than trying to reason it out yourself or reaching for a supplement.

The urinary symptoms worth raising include a weaker or slower stream, difficulty starting, dribbling at the end, needing to go more often (especially at night), a sudden strong urge, or a feeling that the bladder isn’t fully empty. None of these means cancer — far more often they’re benign — but they’re worth a check, because both benign enlargement and, less commonly, more serious causes are worth identifying early.

Some symptoms deserve prompt attention: blood in the urine, being unable to pass urine at all, or pain. If you can’t urinate, treat it as urgent and seek care that day.

The honest version of PSA testing

PSA (prostate-specific antigen) is a blood test that can help detect prostate cancer earlier. It’s genuinely useful, but it isn’t a simple yes/no, and that’s where men deserve the full picture rather than a marketing version.

A raised PSA can be caused by cancer — but also by benign enlargement, infection, recent cycling or ejaculation, and other harmless things. So a high result doesn’t mean cancer, and it usually leads to further tests. On the other side, PSA testing can find slow-growing cancers that would never have caused harm, leading to treatment (with its own side effects) that some men didn’t need. It also occasionally misses cancers. None of this means PSA is bad — it means the decision to test is a genuine shared decision that weighs your age, family history, ethnicity and preferences.

The practical takeaway: don’t demand a PSA test and don’t avoid the topic. Have the conversation with your GP, understand the trade-offs, and decide together. That discussion is worth far more than anything on a supplement label.

What actually supports prostate health

The unglamorous truth is that the things that protect your heart also look after your prostate: staying active, keeping your waist in check, not smoking, sensible alcohol, and a diet heavy on vegetables, whole grains, healthy fats and oily fish. Men who are active and a healthy weight tend to have fewer troublesome urinary symptoms, and the same pattern supports your health right across the board.

What supplements can and can’t do

Let me be plain, because this is a category full of overselling. No supplement treats an enlarged prostate or reduces prostate cancer risk, and any product implying it does is overstepping the evidence and the rules. What some nutrients can honestly claim is more modest: zinc is concentrated in the prostate and supports its normal function, and a varied, nutrient-rich diet supports the gland as part of general health.

You’ll also see saw palmetto marketed heavily for urinary symptoms. It’s a traditional herbal option, but the good-quality evidence is mixed at best, and it isn’t a substitute for getting symptoms assessed. If you want to try it, do so with eyes open and mention it to your GP or pharmacist — particularly if you take other medicines.

Where Lifeguard fits is the daily foundation, not a “prostate pill.” Lifeguard Essentials is our doctor-formulated daily base for adults 45+, sitting underneath the lifestyle basics rather than in place of them. We don’t sell a prostate product, and I’d be sceptical of anyone who promised one.

When to see your GP

Book a visit if urinary symptoms are persistent, bothersome or getting worse, if you’re getting up several times a night, or if you’d simply like to discuss PSA testing and your personal risk. Go promptly — same day — for blood in the urine, an inability to pass urine, or pain. Most of the time the news is reassuring, and the value of going is finding the small number of things that are better caught early.

Frequently asked questions

Is an enlarged prostate a sign of cancer?

Usually not. Benign enlargement (BPH) is extremely common with age and isn’t cancer. But symptoms alone can’t distinguish the two, and early prostate cancer often causes no symptoms, so persistent urinary changes are worth a GP check.

Should I get a PSA test?

It’s a shared decision with your GP. PSA testing can help find cancer earlier, but a raised result has many harmless causes and testing carries trade-offs. Discuss your age, family history and ethnicity with your GP and decide together, rather than for or against by default.

Do prostate supplements like saw palmetto work?

The good-quality evidence for saw palmetto and urinary symptoms is mixed, and no supplement treats an enlarged prostate or lowers cancer risk. If you try one, tell your GP or pharmacist, and don’t let it delay getting symptoms assessed.

What are the warning signs I shouldn’t ignore?

Blood in the urine, being unable to pass urine, or pain, all warrant prompt medical attention — the same day if you can’t urinate. Persistent or worsening urinary symptoms are worth a routine GP visit.

Written by Dr Roderick Mulgan, NZ GP and founder of Lifeguard Health. This article is general information, not medical advice. For advice about your own prostate health or PSA testing, see your GP.