Infertility is clinically defined by how long you’ve been trying to conceive without success. If you’re under 35 and have had regular, unprotected sex for 12 months without getting pregnant, that meets the threshold. If you’re between 35 and 40, the window shortens to six months. Over 40, or if you have a known risk factor like a history of pelvic inflammatory disease or ectopic pregnancy, evaluation is recommended right away. But even before hitting those timelines, your body often gives signs that something may be off.
Signs in Women That Suggest a Problem
The most telling indicator is your menstrual cycle. A cycle shorter than 21 days, longer than 35 days, or one that’s wildly irregular from month to month can mean you’re not ovulating consistently. Absent periods are an even stronger signal. Ovulation is the single most important event in natural conception, and cycle irregularity is the most visible clue that it isn’t happening.
Beyond your period, pay attention to other patterns. Very heavy or extremely painful periods can point to conditions like endometriosis or uterine fibroids, both of which can interfere with conception. Hormonal shifts sometimes show up as persistent acne, thinning hair on your head, or new hair growth on your face and chest. These can be signs of polycystic ovary syndrome (PCOS), one of the most common hormonal causes of infertility in women. PCOS doesn’t have a single definitive test. Diagnosis typically involves a combination of symptom review, blood work to check hormone levels, and an ultrasound to look at the ovaries.
Signs in Men That Suggest a Problem
Male factors contribute to roughly half of all infertility cases, yet many men assume the issue lies elsewhere. Physical signs worth noting include pain, swelling, or a lump in the testicle area. Changes in sexual function also matter: difficulty maintaining an erection, reduced sex drive, problems with ejaculation, or noticeably low volume of ejaculate.
Some signs are subtler. Decreased facial or body hair, unusual breast tissue growth, and recurrent respiratory infections can all point to hormonal or genetic conditions that affect sperm production. An inability to smell, while rare, is associated with a specific hormonal disorder that impairs fertility. None of these symptoms confirm infertility on their own, but they’re worth mentioning to a doctor, especially if conception hasn’t happened after months of trying.
How Age Affects Your Odds
Age plays a major role, particularly for women. In your early to mid-20s, the chance of conceiving in any given month is about 25 to 30 percent. That sounds modest, but it adds up quickly over several cycles. By age 40, the monthly odds drop to around 5 percent. This decline reflects both a shrinking number of eggs and a higher rate of chromosomal issues in the eggs that remain.
Men’s fertility also declines with age, though more gradually. Sperm quality, including motility and DNA integrity, tends to decrease after 40. Age alone doesn’t make someone infertile, but it narrows the window and makes early evaluation more important.
What Fertility Testing Looks Like for Women
If your doctor suspects a fertility issue, the first step is usually blood work. Key hormones they’ll check include progesterone (which confirms whether you ovulated), thyroid-stimulating hormone, prolactin, and estradiol. These help identify hormonal imbalances that can quietly suppress ovulation.
To get a picture of how many eggs you have left relative to your age, doctors use ovarian reserve testing. This combines a blood test measuring anti-Mullerian hormone (AMH) with a transvaginal ultrasound that counts the small follicles visible on your ovaries. A low AMH level or a low follicle count doesn’t mean pregnancy is impossible, but it does suggest a smaller window of opportunity.
If blood work comes back normal, the next step often involves checking the physical anatomy. A hysterosalpingogram, commonly called an HSG, is an imaging test where dye is passed through the uterus and fallopian tubes while X-rays are taken. It reveals whether one or both tubes are blocked and whether the uterine cavity is a normal size and shape. Blocked tubes prevent sperm from reaching the egg and are a common finding in unexplained infertility. The procedure takes about 10 to 15 minutes and can cause cramping similar to a period, though it’s generally well tolerated.
What Fertility Testing Looks Like for Men
The cornerstone of male fertility evaluation is a semen analysis. You provide a sample, and the lab evaluates three main things: how many sperm are present, how well they move, and what percentage have a normal shape.
Normal sperm concentration is 15 million or more per milliliter. Below that, the odds of natural conception drop significantly. At least 40 percent of sperm should be moving efficiently, since only actively swimming sperm can reach and fertilize an egg. And more than 4 percent should have a normal shape, because abnormally formed sperm often can’t penetrate an egg.
If the semen analysis comes back abnormal, doctors will typically order hormone blood tests, checking testosterone, thyroid function, and other hormone levels to look for an underlying cause. A single abnormal result doesn’t necessarily seal the diagnosis. Sperm production is sensitive to recent illness, heat exposure, stress, and other temporary factors, so a repeat analysis a few weeks later is standard practice.
At-Home Fertility Kits
Over-the-counter options exist for both ovulation tracking and male fertility screening. Ovulation predictor kits detect the hormone surge that happens one to two days before you release an egg. They’re useful for timing intercourse but don’t tell you much about overall fertility health.
Home semen analysis kits have become more sophisticated. In clinical validation studies, some have shown accuracy rates around 95 percent when compared to standard lab analysis, with sensitivity of 88 percent and specificity of 93 percent for identifying low sperm counts. They’re fast, private, and can be a reasonable first screening step. That said, they measure fewer parameters than a full lab analysis and aren’t a substitute for clinical evaluation if you’re seriously concerned. They can tell you whether sperm count looks roughly normal but won’t assess morphology or hormonal factors.
Common Conditions Behind Infertility
PCOS is one of the most frequent causes in women. It disrupts the hormonal signals that trigger ovulation, leading to irregular or absent periods. Many women with PCOS also experience insulin resistance, weight gain concentrated around the midsection, and elevated levels of androgens (the hormones responsible for acne and excess hair growth). The good news is that PCOS responds well to treatment, and many women with the condition conceive with medical support.
Endometriosis, where tissue similar to the uterine lining grows outside the uterus, is another major contributor. It can cause severe period pain, pain during sex, and heavy bleeding. Endometriosis can distort pelvic anatomy, damage fallopian tubes, and create an inflammatory environment that makes implantation harder. It’s notoriously difficult to diagnose because symptoms overlap with many other conditions, and imaging doesn’t always catch it.
On the male side, varicocele (enlarged veins in the scrotum) is the most common correctable cause of male infertility. Hormonal imbalances, prior infections, and genetic conditions also play a role. In about 10 to 15 percent of couples, no clear cause is identified even after a full workup, a frustrating but not uncommon outcome.
What to Pay Attention To Right Now
If you’re actively trying to conceive, the simplest thing you can do is track your cycles. Note the start date, length, and any changes in flow. Cycles that are consistently 21 to 35 days and reasonably predictable are a good baseline sign. If your cycles are all over the map, that’s worth investigating sooner rather than later, regardless of how long you’ve been trying.
For men, paying attention to any testicular changes, sexual function shifts, or hormonal symptoms gives you useful information to bring to a doctor. Fertility evaluation is straightforward and noninvasive in the early stages for both partners, and starting the process doesn’t commit you to any particular treatment path. It simply gives you data, which is the most useful thing to have when you’re trying to figure out what’s going on.