Does a Vasectomy Lower Testosterone? What the Hormone Studies Show for Men Over 40

Does a vasectomy lower testosterone? In a study of 437 men aged 40 and older, men with a vasectomy had no lower testosterone, free testosterone or LH than men without one once age and other factors were accounted for. Erectile function scores did not change after the procedure, and the prostate cancer link largely fades in the best-designed studies.

Does a vasectomy lower testosterone? The hormone studies say no. A vasectomy cuts or seals the vas deferens, the two tubes that carry sperm out of the testicles, and leaves the Leydig cells that make testosterone untouched. In a study of 437 men aged 40 and older, Shi and colleagues found no meaningful difference in total testosterone, free testosterone or LH between men with and without a vasectomy after adjusting for other factors.

The worry is understandable. A vasectomy is surgery on the testicles, and a lot of men over 40 already feel their energy and drive slipping. This guide covers what the blood tests show years after a vasectomy, what happens to erections and sex drive, the real complication rates, the prostate cancer question, and how a vasectomy fits with testosterone replacement therapy. Every figure below comes from peer-reviewed studies opened and checked for this article.

A vasectomy does not lower testosterone levels in the studies that have measured them. The largest recent comparison, published by Shi and colleagues in the National Journal of Andrology in 2017, tested 232 men with a vasectomy and 205 men without one, all aged 40 or older. Before adjustment, the vasectomy group actually had slightly higher total testosterone: 17.39 nmol/L versus 16.01 nmol/L.

Sex hormone binding globulin (SHBG) and LH were also a little higher in the vasectomy group, at 70.28 versus 58.91 nmol/L and 10.85 versus 8.86 IU/L. Calculated free testosterone, the fraction the body can use, was essentially identical at 0.23 versus 0.24 nmol/L. Once the researchers adjusted for age and other factors, none of the differences in total testosterone, SHBG, free testosterone or LH were statistically significant. Their conclusion: vasectomy has no obvious long-term influence on serum androgens in aging men.

An older Journal of Urology study points the same way. Mo and colleagues compared 91 pairs of men in 1995, matched for age, weight and neighborhood. Men who had their vasectomy 20 or more years earlier had higher, not lower, testosterone than their matched controls, at 27.2 versus 23.9 nmol/L, and LH and FSH did not differ significantly. Neither study was a randomized trial, but neither found the drop that men fear.

A vasectomy doesn't affect testosterone because hormones and sperm leave the testicles by different routes. Testosterone is made by Leydig cells and enters the bloodstream directly through the testicular veins. The vas deferens only carries sperm. Cutting it blocks sperm transport, while the blood supply and the hormone signal from the pituitary carry on as before. A 2021 review by Yang and colleagues in the World Journal of Men's Health notes that sperm production continues and sperm quality declines only slowly after the procedure.

A vasectomy has not been shown to cause erectile dysfunction or low libido. In a prospective study in the Journal of Sexual Medicine (2014), Al-Ali and colleagues had 76 couples fill out validated questionnaires before and after the procedure. The men, whose average age was 39, showed no significant change in any domain of the International Index of Erectile Function, the standard erection and sexual satisfaction score.

The partners in the Al-Ali study, average age 37, reported significant improvements in desire, arousal, orgasm, lubrication and satisfaction, likely because they no longer worried about pregnancy or used hormonal birth control. Afterwards, 93% of the men and 96% of their partners said they would recommend the procedure. The study was small and had no control group, so it shows an absence of harm rather than a proven benefit.

Men who notice a loss of drive or weaker erections in the years after a vasectomy should look for other causes rather than blaming the procedure. Age, weight gain, poor sleep, alcohol, blood pressure medication and true low testosterone are far more common explanations. Our guides to low testosterone and depression and to erectile dysfunction as an early heart warning cover the usual suspects.

The real side effects of a vasectomy are local and mostly short-lived: bruising, a collection of blood called a haematoma, infection, and pain. A prospective UK audit by Peacock and colleagues, published in BJU International in 2024, tracked 105,393 vasectomies from 2007 to 2022. Haematoma occurred in 1.56%, infection in 1.22% and post-vasectomy pain syndrome, a chronic pain that persists for months, in 0.14%.

The same UK audit measured failure. Early failure, meaning sperm still present on follow-up testing, occurred in 0.93% of cases, and late failure, meaning sperm reappearing after an all-clear, in 0.04%. That is why every vasectomy needs a follow-up semen test before a couple stops other contraception.

Pain after a vasectomy is more common than the UK audit suggests when studies ask directly. A 2020 meta-analysis by Auyeung and colleagues pooled 25 datasets from 18 articles and found an overall incidence of post-vasectomy pain of 15%. The technique mattered: pain was reported after 24% of traditional scalpel procedures and 7% of no-scalpel procedures. Post-vasectomy pain syndrome occurred in 5%, with similar rates for both techniques.

The gap between 5% and 0.14% for chronic pain syndrome reflects how the studies counted it. The meta-analysis included studies with follow-up as long as 37 years that asked men directly about pain, while the UK audit recorded pain syndrome reported to the participating surgeons. For a man weighing the procedure, the honest answer is that persistent pain is uncommon but not rare, and the no-scalpel technique cuts the risk of short-term pain.

A vasectomy does not appear to cause prostate cancer, although a small statistical link shows up in some studies. The strongest evidence comes from large cohorts that adjust for how often men see a doctor. In an Ontario study of 326,607 vasectomized men published in the BMJ in 2016, Nayan and colleagues found an unadjusted hazard ratio of 1.13. After adjusting for health-seeking behaviour, it fell to 1.02, which means no association.

Health-seeking behaviour matters because men who get vasectomies also see urologists, get PSA tests and find small cancers more often. The US Cancer Prevention Study II, reported by Jacobs and colleagues in the Journal of Clinical Oncology in 2016, followed 363,726 men and found no link between vasectomy and prostate cancer death (hazard ratio 1.01). In a subgroup of 66,542 men, there was no link with diagnosis either (hazard ratio 1.02).

The meta-analyses agree on the shape of the evidence. Bhindi and colleagues pooled 53 studies in JAMA Internal Medicine in 2017 and found a weak link with any prostate cancer (rate ratio 1.05) but none with high-grade, advanced or fatal disease, estimating a 0.6% absolute increase in lifetime risk that is unlikely to be causal. A 2022 meta-analysis by Baboudjian and colleagues found that, among studies adjusted for PSA screening, only localized cancer stayed linked (odds ratio 1.06).

A 2025 BMC Cancer analysis by Wang and colleagues added genetic evidence. Pooling 19 cohort studies gave a relative risk of 1.08 for localized prostate cancer, but a Mendelian randomization analysis, which uses genes to test cause and effect, found no causal link. Men over 40 should follow the same prostate monitoring advice whether or not they have had a vasectomy. Our guide to PSA and prostate monitoring explains what to track.

A vasectomy does not appear to affect heart health. Guo and colleagues pooled 12 observational studies with 299,436 participants in a 2017 meta-analysis in Medicine and found no significant link between vasectomy and cardiovascular disease (odds ratio 0.90), coronary heart disease (0.94), stroke (0.90) or heart attack (0.95). The authors noted that better-designed studies in more diverse populations would strengthen the conclusion.

Men can take TRT after a vasectomy, and the vasectomy removes one of the biggest drawbacks of testosterone therapy. External testosterone shuts down the brain's LH and FSH signal, which suppresses sperm production. For a man who still wants children, that is a serious problem. For a man who has finished having children and had a vasectomy, fertility suppression no longer matters in the same way.

TRT does not reverse or replace a vasectomy, and it does not count as contraception for men who have not had one. The two also interact if a man later changes his mind. In a 2022 Scientific Reports case series, Bash and colleagues followed 14 men who had been on testosterone before vasectomy reversal, with a median age of 43 and a median of 11 years since the vasectomy. All 10 men who had semen tested showed open tubes, and 5 achieved a pregnancy, but 2 had very low sperm counts because they kept taking testosterone against medical advice.

Men on TRT who are considering a reversal should talk with a urologist about stopping testosterone first. Our articles on coming off TRT and on enclomiphene as a fertility-preserving alternative explain the options.

This article is for educational purposes only and is not medical advice. It does not diagnose, treat, cure or prevent any disease. Speak with a licensed physician or urologist before any procedure or hormone therapy, and seek prompt care for fever, spreading redness or a rapidly swelling scrotum after a vasectomy.

• Shi YJ et al. Vasectomy has no obvious longterm influence on the levels of serum androgens in aging males. Zhonghua Nan Ke Xue, 2017. https://pubmed.ncbi.nlm.nih.gov/29658249/
• Mo ZN et al. Early and late long-term effects of vasectomy on serum testosterone, dihydrotestosterone, luteinizing hormone and follicle-stimulating hormone levels. Journal of Urology, 1995. https://pubmed.ncbi.nlm.nih.gov/7500459/
• Yang F et al. Review of Vasectomy Complications and Safety Concerns. World Journal of Men's Health, 2021. https://doi.org/10.5534/wjmh.200073
• Mohamad Al-Ali B et al. The effect of vasectomy on the sexual life of couples. Journal of Sexual Medicine, 2014. https://doi.org/10.1111/jsm.12567
• Peacock J et al. Complications of vasectomy: results from a prospective audit of 105 393 procedures. BJU International, 2024. https://doi.org/10.1111/bju.16463
• Auyeung AB et al. Incidence of Post-Vasectomy Pain: Systematic Review and Meta-Analysis. International Journal of Environmental Research and Public Health, 2020. https://doi.org/10.3390/ijerph17051788
• Nayan M et al. Vasectomy and risk of prostate cancer: population based matched cohort study. BMJ, 2016. https://doi.org/10.1136/bmj.i5546
• Jacobs EJ et al. Vasectomy and Prostate Cancer Incidence and Mortality in a Large US Cohort. Journal of Clinical Oncology, 2016. https://doi.org/10.1200/JCO.2015.66.2361
• Bhindi B et al. The Association Between Vasectomy and Prostate Cancer: A Systematic Review and Meta-analysis. JAMA Internal Medicine, 2017. https://doi.org/10.1001/jamainternmed.2017.2791
• Baboudjian M et al. Vasectomy and Risk of Prostate Cancer: A Systematic Review and Meta-analysis. European Urology Open Science, 2022. https://doi.org/10.1016/j.euros.2022.04.012
• Wang L et al. Vasectomy and prostate cancer risk: a pooled of cohort studies and Mendelian randomization analysis. BMC Cancer, 2025. https://doi.org/10.1186/s12885-025-13750-8
• Guo ZL et al. Vasectomy and cardiovascular disease risk: A systematic review and meta-analysis. Medicine (Baltimore), 2017. https://doi.org/10.1097/MD.0000000000007852
• Bash JC et al. Vasectomy reversal outcomes in men after testosterone therapy. Scientific Reports, 2022. https://doi.org/10.1038/s41598-022-22823-8

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