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Nobody hands the man in the waiting room a pamphlet. His partner gets asked how she's feeling, gets follow-up calls from the clinic, and gets a name for what happened to her body. He gets a hand on the shoulder and a quiet "look after her." For a long time, that has been the entire script for men during pregnancy loss. Quietly support, don't ask for anything, move on.
But new research is pulling men out of the background of this story, and it's doing so from two directions at once. One line of evidence looks at biology, at what the male body actually contributes to a pregnancy, and where things can go wrong on that side of the equation. The other looks at what happens afterward, at the grief a man carries that almost nobody checks in on. Both deserve a plain, honest look, without the jargon that usually buries this topic in a medical journal nobody reads.
The Half of the Story That Gets Skipped
For decades, pregnancy loss has been treated as something that happens to women, investigated in women, and explained through women's age, hormones, and anatomy. That focus made sense given the demands pregnancy places on a woman's body. But a man supplies half the genetic material in every embryo, and researchers have started asking a fairly obvious question. If something goes wrong genetically in an early pregnancy, why would we assume the fault always lies with the woman?
A 2025 review makes this point directly, noting that pregnancy loss has historically been attributed almost entirely to maternal factors while the male contribution went largely unexamined [1]. The same review walks through several areas where paternal biology plays a measurable role, including age, general health, and the condition of sperm DNA itself.
What Sperm DNA Has to Do with It
Every sperm cell carries tightly packed DNA, the genetic instructions passed on to a future child. When that DNA is damaged or fragmented, an egg can still be fertilised, but the resulting embryo may struggle to develop properly. Studies found a clear association between sperm DNA fragmentation and recurrent pregnancy loss, meaning the loss of two or more pregnancies in a row [2].
This isn't a fringe theory anymore. The European Society of Human Reproduction and Embryology (ESHRE) updated its clinical guideline on recurrent pregnancy loss in 2023 and now recommends that doctors consider sperm DNA fragmentation testing as part of the diagnostic workup for couples affected by repeat losses [3]. That's a genuine shift in practice. Previously, the only routine test offered to the male partner was a chromosome check. Now, the condition of the sperm itself is on the table.
A more recent paper covering paternal contributions to recurrent pregnancy loss adds mechanical detail to this picture, pointing to oxidative stress, hormone imbalance, and lifestyle exposures as pathways through which sperm quality can decline and affect early embryo development [4].
Age Isn't Only a Woman's Clock
Everyone has heard that a woman's fertility and pregnancy risk shift with age. Fewer people know the same conversation applies to men. Another review pooled data from ten separate studies and found that advanced paternal age, generally defined as beyond forty, was linked to a higher risk of spontaneous miscarriage, even after the researchers adjusted for the mother's age [5].
Nobody is suggesting men need to panic about turning forty. The increase in risk is modest compared with the well-established effect of maternal age. But it does mean paternal age deserves a mention when couples are trying to understand why a pregnancy didn't continue, rather than being left out of the conversation entirely.
The Everyday Habits That Quietly Matter
Sperm takes around three months to develop, which means daily habits from that window show up in semen quality later. A 2022 study found that heavy alcohol use and cigarette smoking were both linked to measurable damage in sperm DNA, with the effect growing stronger when the two habits combined [6]. A separate research study following more than nine thousand women through the Australian Longitudinal Study on Women's Health also confirmed that pre-pregnancy body weight and smoking were tied to a higher risk of miscarriage, underlining how much preconception health, on both sides of a couple, shapes pregnancy outcomes [7].
None of this means a man caused a loss by having a few drinks over the years. Biology rarely works that cleanly, and most pregnancy losses have several contributing factors or no identifiable cause at all. What the research does suggest is that the months before trying to conceive are worth taking seriously, not just for the woman, but for the man, too.
The Grief Nobody Checks On
The physical side is only part of this. A systematic review covering nearly two decades of research on men's grief after pregnancy loss and neonatal death found that men often experience what researchers call double disenfranchised grief. Their loss goes unrecognized because they didn't carry the pregnancy, and their emotional response goes unrecognized because they're expected to be the steady one supporting their partner [8].
That expectation takes a toll. Men in these studies were more likely to suppress their emotions, more likely to throw themselves into work or other distractions, and less likely to reach out for support even when they badly needed it. None of that makes the grief smaller. It just makes it quieter and harder for anyone else to see.
If you've been through this, there is nothing wrong with grieving a pregnancy that didn't continue, even if you weren't the one carrying it. That loss was yours too.
Where This Leaves You
If you and your partner have experienced a pregnancy loss, particularly more than once, it's worth having a proper conversation with a doctor about testing both partners, not just her. Ask specifically about sperm health as part of that workup. It's a reasonable question, backed by current guidelines, not an overreaction.
Outside the clinic, the basics still matter. Cutting back on alcohol and cigarettes, keeping a healthy body weight, and managing stress all support sperm quality over time, and none of that requires a prescription to start.
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REFERENCES
- https://onlinelibrary.wiley.com/doi/10.1111/andr.13603
- https://pubmed.ncbi.nlm.nih.gov/31056315
- https://academic.oup.com/hropen/article/2023/1/hoad002/7068067
- https://pmc.ncbi.nlm.nih.gov/articles/PMC11677278/
- https://pubmed.ncbi.nlm.nih.gov/32358607/
- https://onlinelibrary.wiley.com/doi/full/10.1111/and.14434
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8887017/
- https://pmc.ncbi.nlm.nih.gov/articles/PMC6953275/
FAQs
Can a man's age really affect the risk of miscarriage?
Research shows a modest but real increase in miscarriage risk when the father is over forty, independent of the mother's age [5].
Does sperm DNA damage always cause pregnancy loss?
No. It's one contributing factor among several, and many men with some DNA fragmentation still father healthy pregnancies, but testing can help explain repeat losses [2][3].
