You can’t know for certain whether you’re infertile without medical testing, but there are signs that suggest it’s time to get checked. The most straightforward signal is time: if you and your partner have been having regular unprotected sex for a year without a pregnancy, a fertility issue is likely involved. Infertility is due in whole or in part to the male partner in roughly half of all infertile couples, so this is never just a “women’s issue.”
Physical Signs That May Point to a Problem
Some men have no symptoms at all and only discover a fertility issue after testing. But certain physical changes can be early clues. A lump, swelling, or pain in the testicle area is one of the more noticeable ones. Testicles that feel noticeably small or soft compared to what’s typical can indicate reduced sperm production, since most sperm manufacturing happens in the testicles themselves. Normal testicular length is usually greater than 4 cm.
Other signs are less obvious. Decreased facial or body hair can reflect a hormonal imbalance. Unusual breast tissue growth in men (called gynecomastia) sometimes signals that testosterone levels are off. If you’ve used anabolic steroids to build muscle, your testicles may have shrunk, which directly impacts sperm production. These signs don’t confirm infertility on their own, but they’re worth paying attention to.
Varicoceles: The Most Common Treatable Cause
A varicocele is a swelling of the veins that drain blood from the testicle, and it contributes to about 40% of all male infertility cases. You might notice a dull ache in your scrotum, especially after standing for long periods, or feel something that’s been described as a “bag of worms” above the testicle. Some varicoceles are large enough to see; others can only be detected during an exam when a doctor asks you to bear down.
The problem is heat. Blood pooling in those swollen veins raises the temperature inside the scrotum, and sperm production is extremely sensitive to temperature. That elevated heat can lower your sperm count or impair sperm quality across both testicles, not just the affected side. The good news is that varicoceles are treatable, and sperm parameters often improve after treatment.
Lifestyle Factors That Lower Sperm Quality
Before jumping to a diagnosis, it’s worth looking at what might be working against your fertility right now. Several everyday factors have a measurable impact on sperm count and quality:
- Smoking is linked to lower sperm counts.
- Heavy drinking reduces sperm count and can drop testosterone levels, while also making it harder to get and maintain erections.
- Excess weight correlates with decreasing sperm count and reduced sperm movement as BMI goes up.
- Heat exposure from saunas, hot tubs, tight underwear, or prolonged sitting may impair the body’s ability to produce sperm effectively.
- Stress can interfere with the hormones needed to make healthy sperm and reduce sex drive.
- Certain medications can lower fertility, including some blood pressure drugs, antidepressants, and opioids.
- Toxin exposure from pesticides, lead, and other workplace chemicals affects both sperm quantity and quality.
- Past STIs like chlamydia and gonorrhea can cause lasting damage to the reproductive tract, even after treatment.
None of these factors guarantee infertility, but they stack. A man who smokes, drinks heavily, and sits most of the day is compounding risks. Some of these are reversible, and addressing them can meaningfully improve sperm parameters within a few months, since the body produces a new batch of sperm roughly every 72 days.
What Happens During a Fertility Evaluation
The first step is a semen analysis. You’ll provide a sample by ejaculating into a sterile container, typically at a lab or clinic. The sample is then evaluated both under a microscope and by computer to measure several things: your exact sperm concentration, the percentage of sperm that are moving (motility), the percentage that are alive (vitality), the size and shape of individual sperm (morphology), the volume of your ejaculate, and its acidity. Because sperm counts naturally fluctuate, you’ll usually be asked to do at least two analyses, spaced a few weeks apart.
A doctor will also perform a physical exam, checking your testicles for size, consistency, and any abnormalities. They’ll feel for varicoceles, sometimes asking you to stand, take a deep breath, and bear down to make subtle swelling more detectable. The exam also checks the epididymis (the coiled tube behind each testicle where sperm mature) for signs of blockage or inflammation, and confirms that the vas deferens, the tubes that carry sperm out, are present and intact on both sides. Missing vas deferens on both sides is almost exclusively linked to carrying a gene mutation related to cystic fibrosis.
Blood work typically follows if the semen analysis is abnormal. Hormone levels, particularly testosterone and follicle-stimulating hormone (FSH), help determine whether the issue is with sperm production itself or with the hormonal signals that drive it.
When Genetic Testing Comes Into Play
If your sperm concentration is very low (under 5 million per milliliter) or you have no sperm in your ejaculate at all, your doctor will likely recommend genetic testing. This includes a chromosome analysis and a check for small missing segments on the Y chromosome, which can impair or completely prevent sperm production. If a physical exam suggests missing vas deferens or an unexplained blockage, testing for cystic fibrosis gene mutations is standard. These genetic results matter not just for understanding your fertility, but for understanding what conditions could be passed to a child.
What Home Sperm Tests Can and Can’t Tell You
Over-the-counter sperm test kits are widely available, and they can be a reasonable first look if you’re not ready for a clinic visit. Basic kits simply tell you whether sperm are present in your semen. More advanced smartphone-based versions use your phone’s camera to estimate sperm concentration and motility.
The limitation is significant, though. A home test gives you a fraction of the information a lab analysis provides. You could have 100 million sperm per sample, but if none of them are moving, you won’t be fertile. Home kits can’t assess sperm shape, vitality, or the chemical properties of your semen. They’re useful as a screening tool, not a diagnosis. If a home test comes back with a low number, or if you’re still not achieving pregnancy despite a “normal” home result, a full lab analysis is the necessary next step.
The Timeline That Should Prompt Testing
The general guideline is to seek evaluation after 12 months of regular unprotected intercourse without pregnancy. If your partner is over 35, that window shortens to 6 months because female fertility declines more steeply with age, making earlier testing for both partners more practical. And if you already know about risk factors, like a history of undescended testicles, testicular surgery, cancer treatment, or known hormone issues, there’s no reason to wait. Getting a semen analysis early gives you information and time, two things that matter enormously in fertility.