Diabetes and high blood pressure can affect male reproductive health, but a pill bottle is not enough to explain a poor semen result. Disease control, medication effects and sexual function need to be assessed together. Men trying to conceive should review treatment with a clinician rather than stop it on their own.
“Was It the Medication—or the Disease?”… What Diabetes and Hypertension May Mean for Male Fertility
Mr. A, a man in his 40s who visited a hospital to conceive a child, received unexpected results. His sperm count was significantly lower than normal, and his motility was poor.
He first suspected the blood pressure medication he had been taking for years. He followed up with questions about whether his diabetes or blood pressure medication might have destroyed his sperm. However, the test results told a different story.
The clinical question was whether the underlying disease, medication, other health factors or a combination could explain the findings.
Diabetes and hypertension can affect reproductive and sexual health. Some medicines can also have effects, so an individual medication review and disease assessment are more useful than assuming that either the drug or the diagnosis is always responsible.
Many people think of diabetes and hypertension only as problems of the heart or cerebral blood vessels. That is not the case. The testicles are also organs that rely on countless microvessels. Sperm are not cells created overnight.
Sperm production and maturation take several months. Heat, illness, metabolic health and other factors during that interval can influence semen parameters, but a single result cannot identify the cause.
Diabetes attacks this process head-on. If high blood sugar levels persist, the lining of the blood vessels is damaged, and reactive oxygen species (ROS) increase. As a result, sperm motility decreases and DNA damage increases. Recently, research results have been appearing consecutively showing that the Sperm DNA Fragmentation Index (DFI) appears higher in men with diabetes. This means that even if fertilization occurs, it can affect embryo development and the maintenance of pregnancy.
Hypertension is no different. As blood pressure rises, microvascular function declines, and testicular blood flow decreases. This is why a decrease in sperm count, reduced motility, and worsening erectile function appear simultaneously. In fact, when analyzing male infertility patients, it is not uncommon to find cases accompanied by hypertension and diabetes.
What is more dangerous is that many men do not know this fact.
Even if blood sugar is high, there is no pain. Even if blood pressure is high, daily life is possible. Therefore, it is common for men to leave the disease untreated for years. However, in the meantime, their sperm quietly change. It is not rare for fertility to signal a warning light long before a myocardial infarction or stroke occurs.
Then, is there really no problem with blood pressure and diabetes medication?
Some blood pressure medications have reports of associations with decreased libido, erectile dysfunction, or ejaculation disorders. Ejaculation abnormalities are also rarely observed with certain diabetes medications. However, experts explain that these are issues of sexual function and should be distinguished from issues that directly damage sperm.
What is actually more dangerous is stopping medication arbitrarily. If you stop taking medication for the purpose of preparing for pregnancy and your blood pressure and blood sugar worsen, you may increase not only the risks to your sperm health but also your cardiovascular risks simultaneously.
Recently, the era in which only women were tested at fertility treatment sites is ending rapidly. This is because the fact that male factors account for nearly half of all infertility is being repeatedly confirmed. In particular, for men after 40, chronic disease management status often determines sperm quality more than age itself.
For men concerned about medication and fertility, the practical next step is to bring the full medication list and semen results to a clinician. Maintaining disease control while reviewing possible adverse effects is safer than stopping treatment without advice.
A semen result can prompt a wider health assessment, but it is not a diagnostic test for diabetes, hypertension or future cardiovascular events.