Understanding your sperm health
What actually affects it, and what you can do about it
If you're reading this because someone forwarded it to you, you're not in trouble. This isn't a page about what you've done wrong, this is a page to understand the vulnerability of sperm health in our current environment.
Here's the thing most couples aren't told clearly: in up to half of the couples who get investigated for fertility, something in the sperm is part of the picture. And yet the usual experience for the sperm-producing partner is a single semen analysis, a result sheet, and very little conversation about what any of it means.
That's a strange gap, because sperm are one of the more responsive things in the body. They're made fresh, constantly, and they're sensitive to how you've been living for the last three months. That sensitivity is frustrating but it's also the good news.
What a semen analysis actually tells you
A standard semen analysis measures a handful of things:
Volume — how much semen there is
Concentration — how many sperm per millilitre
Total count — concentration multiplied by volume
Motility — what proportion are moving, and how well they're moving forward
Morphology — what proportion are a normal shape
What it usually doesn't measure is DNA fragmentation, damage to the genetic material the sperm is carrying. It's not part of the standard test in most Australian labs, and it's worth asking your GP or specialist about, particularly if you've had recurrent miscarriage or unexplained IVF failure.
It's also worth knowing that a semen analysis is a snapshot, not a verdict. Results move around a lot between samples. A recent illness, a rough few months at work, or a short abstinence window can all shift the numbers. One below-range result is information, not a diagnosis — most specialists will want a repeat before drawing conclusions.
The three-month window
Sperm take roughly 72 to 90 days to develop from start to finish.
This is the single most useful thing to understand, and it cuts both ways. It means the result on the page in front of you reflects the last three months of your life, not this week. It also means that what you change now shows up in about three months' time.
If you're planning an IVF cycle, or you're actively trying, that window is where the effort belongs.
The bigger picture
There's a well-known piece of research worth knowing about, mostly so you don't panic when you come across it.
A 2023 meta-regression in Human Reproduction Update pooled 223 studies covering 57,168 men across 53 countries and found that sperm concentration among unselected men fell by around half between 1973 and 2018, with the rate of decline roughly doubling after the year 2000.
That's a population trend, not a prediction about you. Plenty of men in that data set had perfectly good results. What it does tell us is that something about how we live now is affecting sperm at a population level, which is a reasonable argument for taking your own results seriously rather than assuming they'll be fine.
The common thread: oxidative stress
Most of what affects sperm quality runs through the same underlying mechanism, and it's worth understanding once.
Your cells produce reactive oxygen species as a normal by-product of making energy. Your body neutralises them with antioxidants. When production outpaces the clean-up, you get oxidative stress, essentially cell damage from an imbalance the body can't mop up.
Sperm are unusually vulnerable to it. They have very little internal repair machinery, their membranes are rich in the kind of fats that oxidise easily, and they're carrying DNA that needs to arrive intact. Research on the mechanism shows oxidative damage:
Stiffens the sperm membrane and impairs the tail's movement — motility drops
Oxidises the structural proteins that shape the head — morphology suffers
Causes breaks in the DNA strand — genetic integrity is compromised
So when you see a list of things that "affect sperm health", most of them are on that list because they push the same balance in the same direction.
What feeds into it
Heat
Testicles sit outside the body for a reason — sperm production needs to run a couple of degrees cooler than core temperature. Anything that warms things up works against that.
Laptops on laps, heated car seats, long-haul driving, saunas and hot tubs, tight clothing, and some trades and work environments all raise scrotal temperature. The evidence is stronger for sustained heat than for occasional exposure, and stronger for saunas and hot tubs than for underwear choice — but most of these are free to change, so there's little reason not to.
Everyday lifestyle
Smoking and vaping, alcohol, recreational drugs (cannabis and anabolic steroids in particular), carrying extra weight, a diet low in fresh food, broken sleep, and long stretches of sitting all show up consistently in the research.
Anabolic steroids deserve a specific mention because the effect is often severe and not always reversible. If that's relevant, say so early to whoever is treating you — it changes the whole approach and it isn't something anyone's going to be shocked by.
Stress
This one gets dismissed, and it shouldn't.
Chronic stress raises cortisol, which suppresses the signal telling the testes to make testosterone, and cortisol is a pro-oxidant in its own right, disrupting the mitochondria sperm rely on for energy. It feeds straight into the same mechanism as everything else on this page.
A study of 1,362 young Danish men found those scoring highest on perceived stress had around 38% lower sperm concentration and 42% lower total sperm count than those scoring lowest. Their hormone markers moved too, and adjusting for smoking, alcohol and cannabis didn't wash the effect out. The estimates were imprecise and the men were young, median age 19, so trust the direction more than the size.
The part people miss: the same study measured actual stressful life events, bereavement, divorce, job loss, and found no association at all. Only perceived stress was linked. It wasn't what had happened to these men that showed up in their results. It was how much pressure they felt under.
Which creates an obvious loop, worth naming. Fertility treatment is stressful, and being told your stress is affecting your sperm doesn't help. The point isn't to add stress about stress, it's that if your nervous system has been running hot for years, that's a legitimate thing to work on, and one of the more addressable items on this list.
Environment
A 2026 review in Frontiers in Medicine maps the environmental side: air pollution and particulate matter, heavy metals like cadmium and lead, endocrine-disrupting chemicals including BPA and phthalates from plastics, pesticide residues, and microplastics. All of them converge on the same oxidative pathway.
The authors describe a "cocktail effect", combined everyday exposures doing more damage together than any single one would on its own. That's a useful idea, because it explains how someone who isn't obviously doing anything wrong can still end up with a poor result.
You can't control air quality. You can reasonably reduce heated plastic contact with food, choose fresh over heavily processed where it's practical, and take proper precautions if your work involves solvents, pesticides or heavy metals.
Medical
Some things need a doctor rather than a lifestyle change:
Varicocele — enlarged veins in the scrotum, present in a meaningful proportion of men with poor semen parameters. It raises local temperature and drives oxidative stress, and it's surgically treatable
Infection and inflammation, including past or current STIs
Recent fever or illness — a bad flu three months ago can show up in today's result
Diabetes and metabolic conditions
Some medications, including certain antidepressants, testosterone replacement (which suppresses sperm production), and some blood pressure medications — never stop a prescribed medication without talking to your prescriber
Age — a gentler effect than in women, but real, particularly for DNA fragmentation
If you haven't had a proper conversation with a GP or urologist about your results, that's the first move. Not us.
What actually helps
Be sceptical of anyone offering you certainty here. The honest summary:
Well supported. Stopping smoking and vaping. Reducing alcohol. Stopping anabolic steroids. Treating a diagnosed varicocele or infection. Getting weight into a healthier range. Reducing sustained heat exposure. Improving sleep.
Reasonable, less certain. A diet with more fresh vegetables, fruit, nuts and fish. Regular moderate exercise, though extreme endurance training may work against you. Reducing exposure to solvents, pesticides and heated plastics.
Mixed and often oversold. Antioxidant supplements. The evidence is low quality and inconsistent, and more is not better, over-supplementing antioxidants can cause its own problems. Talk to a practitioner who will look at your actual situation rather than buying a fertility stack online.
And give it three months. Almost nothing here shows up in a repeat test sooner than that.
Where acupuncture and Chinese medicine fit
Honestly: as one part of the picture, not the whole of it.
There's some research. A 2024 meta-analysis of 11 randomised trials with 1,172 participants reported improvements in sperm density and progressive motility where acupuncture was combined with other treatment. The authors were clear about the limits, all the trials were conducted in China, and most had weaknesses in allocation concealment and blinding. It's preliminary rather than settled, and we'd rather say that than dress it up.
What a session with us actually looks like is less mysterious than you might think. We go through your semen analysis with you so you understand what it says. We do a full Chinese medicine assessment. We use acupuncture, and herbal medicine where it's appropriate. And we work through the list above properly, sleep, stress, heat, alcohol, work exposures, which is often the first time anyone has done that with you.
We're not the right answer for a varicocele or an infection, and we'll tell you so and point you to who is.
Where to start
Get a semen analysis if you haven't had one, and a repeat if you've only had one abnormal result
Ask your GP about a referral to a urologist or fertility specialist, and ask whether DNA fragmentation testing is worth doing in your case
Pick the two or three things on this page that are most obviously relevant to you, not all of them
Give it three months
If you'd like a hand working through it, that's exactly what we're here for.
Book an appointment by calling us on (03) 9111 9910, email hello@machihealth.com.au, or book online.
We're at Rear, 638 Barkly Street, West Footscray.