You can’t know for certain whether you’re infertile without medical testing, but there are signs your body may give you well before you start trying to conceive. The clinical definition is straightforward: infertility means not achieving pregnancy after 12 months of regular unprotected sex. If you’re 35 or older, that window shortens to six months. But many people notice warning signs long before they ever reach that timeline.
Signs in Women That May Point to Fertility Problems
Your menstrual cycle is one of the most visible indicators of reproductive health. A cycle shorter than 21 days, longer than 35 days, or one that’s highly irregular or absent altogether can signal that you’re not ovulating regularly. Without ovulation, pregnancy isn’t possible. These patterns are worth paying attention to even if you’re not currently trying to conceive.
Polycystic ovary syndrome (PCOS) is one of the most common hormonal causes of irregular ovulation. It often comes with other recognizable signs: unusual hair growth on the face or body, persistent acne, weight gain, and insulin resistance. Not everyone with PCOS will have all these symptoms, but a combination of irregular periods and these physical changes is a strong signal worth investigating.
Endometriosis is another major contributor. It causes tissue similar to the uterine lining to grow outside the uterus, and it typically shows up as chronic pelvic pain, intensely painful periods, or pain during sex. Some women also notice pain with bowel movements or urination during their period. Endometriosis can only be definitively diagnosed through a surgical procedure like laparoscopy, though ultrasound can sometimes detect cysts associated with it.
A history of pelvic inflammatory disease, repeated miscarriages, or sexually transmitted infections can also damage the reproductive tract in ways that affect fertility, sometimes without obvious ongoing symptoms.
Signs in Men That May Point to Fertility Problems
Male factor infertility contributes to roughly half of all infertility cases, yet it often gets less attention. Some signs are noticeable without any testing. Difficulty maintaining an erection, problems with ejaculation, reduced sexual desire, or ejaculating very small volumes of fluid can all indicate an underlying issue affecting fertility.
Physical changes matter too. Pain, swelling, or a lump in the testicle area should always be evaluated. Decreased facial or body hair, unusual breast tissue growth, or a loss of the ability to smell can point to hormonal or chromosomal conditions that affect sperm production. Recurrent respiratory infections are another less obvious sign, sometimes linked to rare genetic conditions that also impair fertility.
Many men with low sperm counts have no symptoms at all. The only way to confirm is through a semen analysis, where a lab evaluates sperm count, movement, and shape. Current reference values consider fewer than 39 million total sperm per ejaculate or less than 15 million per milliliter to be below normal. At least 42% of sperm should be moving, and at least 4% should have a normal shape. Falling below these thresholds doesn’t mean pregnancy is impossible, but it does reduce the odds.
What You Can Check at Home
Tracking ovulation is one of the most useful things you can do before seeing a doctor. Your basal body temperature (the temperature you take first thing in the morning before getting out of bed) rises slightly after ovulation, typically by less than half a degree Fahrenheit. When that small rise holds steady for three or more days, ovulation has likely occurred. You’re actually most fertile in the two days before that temperature shift, so tracking over several months helps you see whether you’re ovulating consistently and time intercourse accordingly.
Cervical mucus also changes throughout your cycle. Around ovulation, it becomes clear, slippery, and stretchy, similar in consistency to raw egg whites. If you never notice this change, or if your temperature never shows a clear shift across multiple cycles, that’s useful information to bring to a doctor.
Over-the-counter ovulation predictor kits detect a hormone surge that happens one to two days before ovulation. They’re a simpler option than temperature tracking and can confirm whether that surge is happening each month.
Medical Tests Used to Diagnose Infertility
When you see a specialist, the testing process depends on your situation, but typically covers a few key areas.
For women, blood tests can measure hormone levels that reflect egg reserve and ovarian function. A pelvic ultrasound examines the ovaries and uterus for structural issues like cysts, fibroids, or polyps. One of the more specific tests is a hysterosalpingogram (HSG), an X-ray where dye is injected into the uterus to check whether the fallopian tubes are open and whether the uterus has a normal shape. Blocked tubes, which can result from endometriosis, past ectopic pregnancies, or prior infections, are a common finding. The HSG can also reveal structural variations in the uterus that may interfere with implantation.
For men, the process usually starts with a semen analysis. If results come back abnormal, further hormone testing or imaging may follow. In some cases, a physical exam alone can identify issues like a varicocele (enlarged veins in the scrotum) that affect sperm quality.
Secondary Infertility Looks Different
If you’ve had a child before but are now struggling to conceive again, that’s called secondary infertility. It catches many people off guard because they assume past success guarantees future success. It doesn’t. Secondary infertility is diagnosed when you can’t get pregnant or carry a pregnancy to term after previously giving birth without fertility treatments.
The causes overlap with primary infertility but also include factors that change over time: aging (egg and sperm quality decline with age), weight gain, complications from a prior pregnancy or cesarean section, new medications, and lifestyle changes like increased alcohol use or smoking. Sexually transmitted infections acquired since the last pregnancy can also cause new damage to the reproductive tract.
When to Get Tested Sooner
The 12-month guideline applies to couples under 35 with no known risk factors. Several situations warrant seeing a specialist earlier.
- Age 35 to 39: Seek evaluation after six months of trying.
- Age 40 or older: Consider starting with a fertility specialist rather than waiting.
- Two or more miscarriages: This pattern suggests an underlying issue that benefits from monitoring.
- Irregular, absent, or very heavy periods: These can indicate ovulation problems worth investigating right away.
- History of STIs or pelvic inflammatory disease: Both can cause tubal damage that’s invisible without testing.
- Erectile dysfunction or ejaculation problems: These directly affect the ability to conceive and may reflect hormonal issues.
- Chronic health conditions: Diabetes, thyroid disorders, kidney disease, hypertension, and heart disease can all affect fertility.
- Prior cancer treatment: Chemotherapy and radiation can impair egg and sperm production, sometimes permanently.
- Family history of early menopause: If your mother went through menopause unusually early, your egg reserve may decline sooner than average.
Infertility is common, affecting roughly 1 in 6 people at some point. Many of the causes are treatable once identified. The signs your body gives you, from cycle irregularities to physical changes, aren’t a diagnosis on their own, but they’re the starting point that tells you whether and when to get answers.