Infertility is the inability to conceive after one year of unprotected intercourse if you are under 35, or after six months if you are 35 or older. It is a medical diagnosis, not a character flaw or a guarantee that you will never carry a pregnancy—it means your reproductive system needs evaluation or support to achieve pregnancy. Many people with an infertility diagnosis do conceive, and many factors that affect fertility are treatable or manageable.
This article explains what infertility is, when to seek care, what doctors look for, and what you can realistically expect. It is not a substitute for a medical evaluation, and every fertility story is individual. If you have been trying to conceive and are worried, talking to a clinician is the single most useful step you can take.
Table of Contents
- The Clock and the Timeline
- Why Age Changes Everything
- What a Doctor Looks For First
- Ovulation Problems and Irregular Cycles
- Fallopian Tube and Uterine Factors
- Endometriosis and Pelvic Adhesions
- Male Factor and Sperm Health
- Making the Decision to See a Specialist
- Lifestyle Factors That Matter and Ones That Do Not
- What "Normal" Looks Like
- Frequently Asked Questions
The Clock and the Timeline
The one-year waiting period before infertility is diagnosed assumes a baseline level of reproductive aging. If you are under 35 and trying to conceive, one year of regular unprotected intercourse without pregnancy is the threshold for an infertility evaluation.
At 35 or older, that timeline shortens to six months, because fertility declines with age and waiting longer can reduce your options for treatment. Age 40 and beyond is treated even more urgently—some clinicians recommend evaluation after three months. These timelines exist because they balance two competing needs: avoiding unnecessary tests for people who may conceive without intervention, and catching problems early in people where time matters.
If you are in your late 30s or 40s, do not wait a full year before calling your doctor. Conversely, if you are 28 and have been trying for eight months, you do not need to panic; most doctors will still prefer to wait until the one-year mark unless other risk factors apply. "Trying to conceive" means regular unprotected intercourse.
If you use birth control most months and are unprotected only occasionally, you are not actively trying yet. If you are tracking ovulation and timing intercourse to your fertile window, you are trying. The consistency matters for the timeline because irregular patterns make the timeline meaningless—it stretches on indefinitely. Some people can identify risk factors that justify earlier evaluation.
Irregular periods, a history of pelvic infections, endometriosis, a previous ectopic pregnancy, or a partner's known fertility concerns all warrant a conversation with your doctor sooner rather than waiting. Having had a pregnancy before (even if it did not result in a live birth) does not mean you will conceive again as easily; infertility can emerge newly at any age.
The timeline is a guideline, not a rule. If you have been trying for six months and are already worried, talking to a fertility specialist does not hurt. An evaluation may show nothing is wrong and give you peace of mind, or it may identify something that can be addressed. Either way, you have information instead of uncertainty.
Why Age Changes Everything
Age is the single strongest predictor of fertility for the person attempting to conceive. At 25, roughly 20 percent of cycles with unprotected intercourse result in pregnancy; at 35, that drops to about 10 percent per cycle; at 40, it falls to 5 percent or lower. These are population averages, not predictions for any one person, but they show the overall trend.
Egg quality declines gradually from the teens onward and accelerates after 35. This is not because older people are less fertile in some absolute sense—it is because the eggs themselves age. Eggs begin to develop before you are born and sit in a paused state until ovulation.
The longer an egg waits, the more likely the DNA inside has picked up errors. By 40, most eggs carry chromosomal problems that prevent a pregnancy from developing. This is why age affects both the time it takes to conceive and the miscarriage rate. Partners over 40 also show a small decline in fertility due to reduced sperm count or mobility, but this change is far gentler than the egg-age effect.
If the person trying to conceive is over 40, that is the factor that dominates the timeline and urgency. At any age, one miscarriage does not mean you have infertility. But if you are over 35 and have had two miscarriages, or over 40 and have had one, your doctor should investigate. Recurrent loss can signal chromosomal or immune issues that may need treatment.
The age cutoff of 35 for accelerated evaluation is not arbitrary—it marks the point where the decline in egg quality becomes steep enough that waiting longer meaningfully changes your options. If you are 36 or older and want to conceive, do not hesitate to ask for testing. You are not being impatient; you are making a sound decision.
What a Doctor Looks For First
An infertility evaluation starts with simple questions and tests that rule out easily correctable problems before moving to expensive or invasive ones. Your doctor will ask about your cycle length and regularity, any pelvic pain, previous pregnancies, miscarriages, sexually transmitted infections, and general health. For the partner, questions center on any prior fertility issues, sexual function, and general health.
Neither of you needs to feel self-conscious answering these—they reveal a huge amount. A basic blood test can confirm that ovulation is happening. One blood draw in the second half of your cycle (usually around day 21 of a 28-day cycle) measures progesterone, which rises only if an egg has been released. If progesterone is high, ovulation is confirmed.
Low progesterone suggests the ovaries are not releasing eggs, which could mean irregular cycles, problems with the pituitary gland, or other hormonal issues. This one test often points to the solution. An ultrasound of the pelvis can show the health of the ovaries and uterus. It can reveal cysts on the ovaries, fibroids or polyps inside the uterus, or scar tissue.
It can also count the number of small developing follicles (early-stage eggs), which gives a rough sense of ovarian reserve—how many fertile years remain. Ultrasound is not invasive and gives a lot of information in one go. A semen analysis tests the partner's sperm count, motility (movement), and shape. Low count, poor movement, or abnormal shape all reduce fertility but do not make it impossible.
Many people with less-than-ideal semen analysis still conceive naturally, and others benefit from intrauterine insemination (IUI) or in vitro fertilization (IVF). The analysis is straightforward and noninvasive. If these basics look normal and you have been trying for a year (or six months if you are over 35), the next step is usually either a hysterosalpingogram (an X-ray that checks whether the fallopian tubes are open) or a specialist referral. Do not assume you need either until your doctor recommends it.
Ovulation Problems and Irregular Cycles
Infrequent or absent ovulation accounts for about one-third of infertility in people trying to conceive. If your cycles are shorter than 21 days or longer than 35 days, or if they vary widely from month to month, that is usually a sign something is off. Many of these problems are treatable. Polycystic ovary syndrome (PCOS) is the most common hormonal cause of irregular cycles and infertility.
People with PCOS develop multiple small cysts on the ovaries, and the ovaries make too much testosterone. This suppresses ovulation and can make cycles irregular, heavy, or absent. PCOS is manageable: birth control can regulate cycles, and medications like metformin or spironolactone can reduce androgen (testosterone) levels and restore ovulation. Weight loss of 5 to 10 percent, if applicable, can also help.
PCOS does not mean you cannot conceive; it means you will likely need support. Thyroid problems affect fertility by disrupting the hormones that trigger ovulation. Both high and low thyroid hormone can throw off cycles. A simple blood test (TSH and free T4) catches this. If your thyroid is underactive, taking thyroid hormone usually fixes the problem.
If you have had irregular cycles for years and were never tested, ask for thyroid labs. Hypothalamic amenorrhea—the absence of periods due to stress, extreme exercise, or low body weight—stops ovulation completely. Periods return once stress eases, exercise is reduced, or adequate nutrition is restored. This is not permanent infertility, and cycles usually resume within a few months of the underlying cause being addressed.
Elevated prolactin, a hormone that triggers milk production, can suppress ovulation even if you are not pregnant. Blood tests identify this. A pituitary tumor, certain medications, or an underactive thyroid can raise prolactin. Once the cause is found and treated, ovulation usually resumes. If your cycles are irregular or absent, start with a blood test and an ultrasound. Most of these conditions are detectable and many are treatable without surgery or advanced procedures.
Fallopian Tube and Uterine Factors
Blocked or damaged fallopian tubes account for about 10 to 15 percent of infertility. Tubes can be blocked by scar tissue from previous infections (especially sexually transmitted infections like chlamydia), endometriosis, or pelvic surgery. You cannot feel a blocked tube; you only know there is a problem when conception does not happen or when imaging shows it.
A hysterosalpingogram (HSG)—an X-ray with dye injected through the cervix—shows whether dye flows through the tubes. If it does, the tubes are open. If it does not, they are blocked or damaged. Uterine fibroids are noncancerous growths inside or on the uterus. They are common and most do not affect fertility. However, large fibroids or those that grow into the uterine cavity can make implantation difficult or increase miscarriage risk.
Ultrasound shows their size and position. Smaller fibroids often do not need treatment before trying to conceive; larger ones inside the cavity may warrant surgical removal. Uterine polyps are small, benign growths inside the uterus that can interfere with implantation. They are found by ultrasound or hysteroscopy (a camera passed through the cervix). A simple outpatient procedure removes them.
Asherman syndrome is scar tissue inside the uterus, usually from previous dilation and curettage (D&C), aggressive curettage after miscarriage, or severe infection. Scar tissue can reduce the space available for an embryo or block the fallopian tubes where they enter the uterus. This is treatable with surgery, though pregnancy rates improve only modestly even after adhesions are removed.
A uterine septum—a wall of tissue partially dividing the uterus—is a structural variation present from birth. It does not prevent conception but can increase miscarriage risk. Surgery to remove the septum may help, though evidence is mixed. This is identified by ultrasound or MRI. If your tubes are blocked or your uterus has structural problems, many can be corrected surgically. Talk to your doctor about what repair is possible and whether surgery will meaningfully improve your chances.
Endometriosis and Pelvic Adhesions
Endometriosis—tissue similar to the uterine lining growing outside the uterus—affects 2 to 10 percent of people with infertility. It causes inflammation, scarring, and sometimes blockage of the fallopian tubes. The pain during periods is often severe, though some people with endometriosis feel no pain at all. It is diagnosed by laparoscopy, a minimally invasive surgery using a camera to look inside the pelvis.
Mild endometriosis does not always prevent conception; many people with mild disease conceive naturally. Moderate to severe endometriosis, especially if it has scarred or blocked the tubes, is harder to work around. Treatment can mean hormonal therapy (birth control, GnRH agonists) to slow growth, or surgery to remove visible lesions and adhesions. After surgery, fertility often improves for the first 6 to 12 months, though lesions can grow back.
Because surgery is not a permanent cure, timing matters: do not delay trying to conceive after surgery. Pelvic adhesions—bands of scar tissue gluing organs together—can distort the fallopian tubes, pull the ovaries, or restrict their movement. Adhesions form after infection (pelvic inflammatory disease, appendicitis), surgery (cesarean delivery, D&C), or endometriosis. Many people do not know they have adhesions until imaging or surgery is done to investigate infertility.
Adhesions can make pregnancy less likely but do not make it impossible. Surgery to remove adhesions and endometrial lesions is called adhesiolysis. It may improve fertility, especially in severe cases, but results vary widely. For some people, IVF is a more reliable path because it bypasses tubes and adhesions entirely. If you have painful periods, a history of pelvic infection, or pelvic pain, talk to your doctor about whether laparoscopy is worth considering. Do not assume you need it immediately; less invasive testing often answers the questions first.
Male Factor and Sperm Health
Male factor infertility—reduced sperm count, poor motility, or abnormal shape—accounts for about 30 to 40 percent of infertility cases. A semen analysis gives three key numbers: count (how many sperm per milliliter of ejaculate), motility (what percentage are swimming forward normally), and morphology (what percentage have normal shape). Lower-than-normal values do not make conception impossible, but they reduce the odds.
Low sperm count (oligospermia) can result from heat exposure (tight underwear, hot baths, fever), infections, hormonal problems, genetic conditions, or side effects of medications. Varicocele—enlarged veins in the scrotum that trap heat—is a treatable cause of low count. Heat reduction alone sometimes improves counts within two to three months. If counts remain low after three months of avoiding heat and any addressable infections or medications, surgery or other treatments may help, though success varies.
Poor motility (asthenospermia) means sperm are not swimming effectively. Causes include infection, structural problems with the sperm tail, or autoimmune issues. Treatment depends on the underlying cause. Some motility problems improve with antioxidant supplements, though evidence is modest. IUI or IVF often increases conception chances if motility is poor. Abnormal shape (teratospermia) means most sperm have bent tails or other deformities.
Severe teratospermia can indicate chromosomal issues in the partner. Moderate abnormalities usually do not prevent conception, but IVF may improve odds. If a semen analysis shows problems, talk to a urologist or fertility specialist before deciding whether to treat or move directly to assisted reproductive options. Some male factor issues resolve with time and lifestyle changes; others need medical intervention. Many couples with male factor infertility conceive with IVF.
Making the Decision to See a Specialist
If basic testing shows a clear problem—blocked tubes, no ovulation, very low sperm count—you need a fertility specialist (reproductive endocrinologist or reproductive urologist). If basic testing is normal but you have not conceived after the waiting period, you should also see a specialist. They can order more specialized tests, discuss treatment options, and make a plan.
A fertility specialist can perform additional testing that a general doctor may not offer: advanced ultrasound techniques, hysteroscopy (looking inside the uterus with a camera), laparoscopy (looking inside the pelvis), genetic screening of embryos, or immune testing. They know which tests actually change management and which ones do not. They can also discuss whether assisted reproduction (IUI or IVF) makes sense for your situation.
Fertility treatment ranges from simple and affordable (taking a pill to trigger ovulation, timed intercourse) to expensive and complex (IVF, which can cost $12,000 to $15,000 per cycle without insurance coverage). Insurance coverage varies widely by state and by plan. Before starting treatment, talk to your specialist's office about cost, insurance coverage, and what each option involves.
If cost is a barrier, discuss this openly with your doctor. Some clinics offer payment plans, sliding scales, or access to lower-cost treatment options. Some states mandate coverage for fertility testing or treatment; some do not. Knowing your options allows you to make a plan that works for your situation. Not everyone needs or wants fertility treatment.
Some people pursue adoption or living child-free. These are valid choices. A specialist's job is to tell you what is medically possible, not to push you toward any particular path.
Lifestyle Factors That Matter and Ones That Do Not
Certain health factors genuinely affect fertility. Obesity (BMI over 30) can disrupt ovulation and reduce fertility; weight loss of 5 to 10 percent often improves cycles and conception chances. Smoking reduces fertility in both people trying to conceive and partners; quitting improves odds and usually works within weeks. Excessive alcohol use can disrupt ovulation; moderate or no alcohol is better.
Uncontrolled diabetes raises miscarriage risk; good blood sugar control helps. Stress does not cause infertility, despite what you may have heard. People conceive under tremendous stress, including during wars and natural disasters. That said, stress is unpleasant and managing it makes trying to conceive less miserable. Therapy, exercise, meditation, or other coping strategies benefit your overall health.
Sexually transmitted infections can damage the fallopian tubes and cause infertility. If you or your partner have ever had chlamydia or gonorrhea, you should be tested; if treated, the infection itself no longer affects fertility, but scarring might. Testing now is not possible (an antibiotic cures the infection but cannot undo old scarring), but it matters for understanding your risk.
Female age matters enormously. Male age matters much less—sperm production does not decline significantly until the 60s, and even then, men in their 60s and 70s can father children naturally. This is not fair, but it is how human reproduction works. Caffeine, occasional marijuana use, and moderate exercise do not reduce fertility. Extreme endurance exercise (like running 50+ miles per week) or very low body weight can stop ovulation, but normal exercise is fine and is actually good for health.
Specific supplements, special diets, or acupuncture do not have strong evidence for improving fertility, though some people feel they help. If a supplement costs a lot and feels like a last-ditch solution, talk to your doctor before buying it. Your money and time are better spent on proven diagnostic and treatment options.
What "Normal" Looks Like
Many people trying to conceive feel like they should have gotten pregnant by now and that something must be wrong. The truth is more complicated: even at the most fertile ages, with perfectly timed intercourse, pregnancy happens in only about 20 percent of cycles. With less perfect timing, the rate is lower. Most people who eventually have a child took several months to conceive.
This is not failure; it is how reproduction works. One year of trying (or six months if you are over 35) before seeking evaluation is the medical standard because many people who do not meet the infertility criteria eventually conceive on their own. About half of people who have not conceived after one year will conceive in the next year without treatment.
That does not mean you should not pursue evaluation if you want answers sooner—it just means the criteria exist partly to avoid labeling everyone who is slightly unlucky as "infertile." Having one or two miscarriages does not mean you have infertility. Miscarriage happens in about 15 to 20 percent of recognized pregnancies, and the rate is higher if you are older.
Miscarriage is usually random—a one-time chromosomal accident—not a sign that you cannot carry a pregnancy. If you have had three or more miscarriages, that warrants investigation, because recurrent loss can signal treatable problems. Infertility is also not binary. You are not either fertile or infertile; many people fall in the middle—they can conceive, but it is harder and takes longer than they expected.
Low ovarian reserve, mild sperm problems, or a narrowed but open fallopian tube makes conception less likely but not impossible. These diagnoses do not necessarily mean you need treatment; they mean you have information. If you have been trying for months and are exhausted or demoralized, that is real and valid. Pursuing an evaluation can bring relief because you either rule out major problems or get answers that point to a next step. Either way, you are no longer in uncertainty.
Frequently Asked Questions
How long should we try to conceive before seeing a doctor?
If you are under 35, one year of unprotected intercourse is the standard threshold. If you are 35 or older, six months is recommended. If you are over 40, three months is reasonable. If you have a known risk factor (irregular periods, a history of pelvic infection, or a partner's fertility concerns), talk to your doctor sooner.
Does infertility mean I will never have a biological child?
No. Infertility is a diagnosis that means getting pregnant is harder, not impossible. Many people diagnosed with infertility do conceive with evaluation, treatment, or time. The diagnosis points to a need for investigation or support, not a permanent barrier.
Can irregular periods mean I am infertile?
Irregular periods often signal that ovulation is not happening reliably, which does make pregnancy harder. But irregular does not mean zero. Many people with PCOS or other causes of irregular cycles do conceive naturally or with treatment. Irregular cycles are worth investigating, but they are not a death sentence.
Is there a test that shows whether I can get pregnant?
Not a perfect one. Ovarian reserve testing (FSH, AMH blood tests, and ultrasound follicle counts) gives a rough estimate of the number of eggs remaining, but does not predict individual fertility or success. Even with low ovarian reserve, pregnancy is possible. A semen analysis and ovulation confirmation test tell you a lot, but neither guarantees results.
Should we try any supplements or diets before seeing a doctor?
Most supplements do not have strong evidence for improving fertility. If you enjoy taking them and can afford them, no harm, but do not count them as a substitute for evaluation. Your money is better spent on testing and, if needed, proven treatment. A healthy diet and basic health habits help, but special fertility diets are not necessary.
What is the most common cause of infertility?
Ovulation problems and male factor infertility are the most common identifiable causes. Tubal damage and uterine issues are also frequent. Many couples have no obvious problem despite failing to conceive; these cases may involve subtle issues that standard testing does not always catch.
