There’s an intense emotional response to hearing, “There is no apparent reason for your infertility”. It can be difficult, maddening and equally frustrating for both you and your partner. People who do find out a specific cause find their situations difficult, too, of course, but knowing the “whys” makes it more bearable. In cases of unexplained infertility, couples feel that one reason, one cause is lurking in a shadowy corner. It just hasn’t been uncovered yet.

From the What to Expect editorial team and Heidi Murkoff, author of What to Expect Before You’re Expecting. Health information on this site is based on peer-reviewed medical journals and highly respected health organizations and institutions including ACOG (American College of Obstetricians and Gynecologists), CDC (Centers for Disease Control and Prevention) and AAP (American Academy of Pediatrics), as well as the What to Expect books by Heidi Murkoff.
Our team here at the Center for Human Reproduction has recently developed an infographic explaining one of the most common causes of female infertility: unexplained infertility. This diagnosis is given to 30% of infertility cases and yet, we believe it really is a non-diagnosis. In our clinical experience, with proper testing, up to 90% of unexplained infertility diagnoses can be attributed to treatable causes.
A recent controversy in California focused on the question of whether physicians opposed to same-sex relationships should be required to perform IVF for a lesbian couple. Guadalupe T. Benitez, a lesbian medical assistant from San Diego, sued doctors Christine Brody and Douglas Fenton of the North Coast Women's Care Medical Group after Brody told her that she had "religious-based objections to treating her and homosexuals in general to help them conceive children by artificial insemination," and Fenton refused to authorise a refill of her prescription for the fertility drug Clomid on the same grounds.[111][112] The California Medical Association had initially sided with Brody and Fenton, but the case, North Coast Women's Care Medical Group v. Superior Court, was decided unanimously by the California State Supreme Court in favour of Benitez on 19 August 2008.[113][114]

4. Significant Hair Growth (or Hair Loss): Polycystic ovarian syndrome causes small cysts to form on the outside of the ovaries, and it also causes the body to produce an excess of male hormones. If you notice hair growing in unusual places like your face, arms, chest or back, this could be a warning sign. On the flip side, hair loss or thinning could be a sign of other infertility related conditions like thyroid issues, anemia or autoimmune disorders.

Upwards of 30% of couples seeking fertility care are labeled with unexplained infertility. Given that over 50% of couples’ infertility struggles are at least partially attributable to the male, understanding the source of male infertility could allow for improved care. The limited set of male tests can only detect the major causes of infertility (i.e., azoospermia) leaving the less obvious factors invisible.
Fertility preservation for cancer or other health conditions. If you're about to start cancer treatment — such as radiation or chemotherapy — that could harm your fertility, IVF for fertility preservation may be an option. Women can have eggs harvested from their ovaries and frozen in an unfertilized state for later use. Or the eggs can be fertilized and frozen as embryos for future use.
Treatment depends on the cause of infertility, but may include counselling, fertility treatments, which include in vitro fertilization. According to ESHRE recommendations, couples with an estimated live birth rate of 40% or higher per year are encouraged to continue aiming for a spontaneous pregnancy.[63] Treatment methods for infertility may be grouped as medical or complementary and alternative treatments. Some methods may be used in concert with other methods. Drugs used for both women and men[64] include clomiphene citrate, human menopausal gonadotropin (hMG), follicle-stimulating hormone (FSH), human chorionic gonadotropin (hCG), gonadotropin-releasing hormone (GnRH) analogues, aromatase inhibitors, and metformin.
In vitro fertilization (IVF) is a treatment for infertility or genetic problems. If IVF is performed to treat infertility, you and your partner might be able to try less-invasive treatment options before attempting IVF, including fertility drugs to increase production of eggs or intrauterine insemination — a procedure in which sperm are placed directly in your uterus near the time of ovulation.
In cases where the man's sperm count is extremely low or there is poor motility (movement of the sperm), doctors may combine IVF with a procedure called intracytoplasmic sperm injection. In this procedure, a sperm is taken from semen -- or in some cases right from the testicles -- and inserted directly into the egg. Once a viable embryo is produced, it is transferred to the uterus using the usual IVF procedure.

Egg Development – This step is either part of the woman’s natural egg development or stimulated with medications and lasts roughly 5-14 days. Once your follicles are optimal size, a trigger medication may be given to finalize egg maturation and trigger ovulation. This phase of egg development may or may not be accompanied by ultrasound and bloodwork monitoring.
In contrast, a study in 2016 compared outcomes of IVF and ICSI in patients with unexplained infertility and normal semen quality and showed promising results using ICSI 3. It was found that ICSI oocytes (84.5%) had a significantly higher fertilization rate compared to those inseminated by conventional IVF (67.6%). Moreover, there were no cases of complete fertilization failure (CFF) in the ICSI group, but CFF occurred in 7.9% of the IVF group.
Ovary stimulation. For eight to 14 days near the beginning of your menstrual cycle, you take a gonadotropin, a type of fertility drug that stimulates your ovaries to develop multiple mature eggs for fertilization (instead of just one). You also need to take a synthetic hormone like leuprolide or cetrorelix to keep your body from releasing the eggs too early.
Risk of ovarian hyperstimulation syndrome (OHSS). OHSS can happen when women respond too well to fertility drugs and produce too many eggs. About 10 to 20 percent of women who take gonadotropins develop a mild form of OHSS, a condition marked by weight gain and a full, bloated feeling. Some also have shortness of breath, dizziness, pelvic pain, nausea, and vomiting. If you have OHSS, your ovaries swell to several times the normal size and produce fluid that accumulates in your abdominal cavity. Normally this resolves itself with careful monitoring by a physician and bed rest. But in rare cases it's life threatening, and you may have to be hospitalized for more intensive monitoring or treatment.
Availability of IVF in England is determined by Clinical commissioning groups. The National Institute for Health and Care Excellence recommends up to 3 cycles of treatment for women under 40 years old with minimal success conceiving after 2 years of unprotected sex. Cycles will not be continued for women who are older than 40 years old.[156] CCGs in Essex, Bedfordshire and Somerset have reduced funding to one cycle, or none, and it is expected that reductions will become more widespread. Funding may be available in "exceptional circumstances" – for example if a male partner has a transmittable infection or one partner is affected by cancer treatment. According to the campaign group Fertility Fairness at the end of 2014 every CCG in England was funding at least one cycle of IVF".[157] Prices paid by the NHS in England varied between under £3,000 to more than £6,000 in 2014/5.[158] In February 2013, the cost of implementing the NICE guidelines for IVF along with other treatments for infertility was projected to be £236,000 per year per 100,000 members of the population.[159]
Problems with the uterus: There are many conditions related to the uterus that can cause secondary infertility. Scarring can occur during a dilation and curettage (D&C) or Cesarean delivery that can create adhesions inside the uterus that interfere with future pregnancies Fibroids or polyps are benign (non-cancer) growths inside the uterus that can impair pregnancy. A retained placenta can cause infection and uterine scarring.

 It is important for couples to maintain open and honest communication with each other, and to recognize that feelings can change over time. For single parents wishing to have additional children, it's also important that they try to develop a strong support system through friends and family. And, because children can pick up on their parents' stress, it is also important to pay attention to how their kids may be feeling. Children might not understand why their parents are feeling a certain way and attribute it to something they've done.  
Once the semen sample is ready, it'll be put through a special washing process, which separates the sperm from the other stuff that is found in semen. The embryologist will choose the “best-looking sperm," placing about 10,000 sperm in each culture dish with an oocyte. The culture dishes are kept in a special incubator, and after 12 to 24 hours, they are inspected for signs of fertilization.

Treatment with Clomid tablets plus IUI improves fertility rates. For unexplained infertility, studies have shown that for women under 35, monthly success rates for Clomid plus insemination are about 10% per cycle. This pregnancy rate holds up for about 3 tries and the success rate is considerably lower after that. More about success rates with IUIs is on the insemination page and on the Clomid for unexplained infertility page. The insemination component boosts fertility more than the Clomid does - but success rates are higher when both are used together.


In the United States, women seeking to be an embryo recipient undergo infectious disease screening required by the U.S. Food and Drug Administration (FDA), and reproductive tests to determine the best placement location and cycle timing before the actual Embryo Transfer occurs. The amount of screening the embryo has already undergone is largely dependent on the genetic parents' own IVF clinic and process. The embryo recipient may elect to have her own embryologist conduct further testing.
A doctor or WHNP takes a medical history and gives a physical examination. They can also carry out some basic tests on both partners to see if there is an identifiable reason for not having achieved a pregnancy. If necessary, they refer patients to a fertility clinic or local hospital for more specialized tests. The results of these tests help determine the best fertility treatment.

Time. The factor of time cuts both ways when you are weighing up these two options. IUI is a much shorter process than IVF, so if your first cycle is successful, it could be the quickest route to bringing home a baby. However, because of the gap in success rates between the two treatments, some patients in their late 30s to early 40s may get pregnant faster by going directly to IVF rather than waiting until they have had several failed IUI cycles.
Apart from poor egg quality at advanced maternal age, older women are also less likely to respond to ovarian stimulation hormones that cause the release of multiple eggs. Being able to produce a dozen of eggs significantly increases the odds of success. It allows your fertility practitioner to choose the egg with normal genetic makeup and best likelihood of implantation. In both nature and IVF, not all eggs are suitable to produce a pregnancy. Ideally, you would produce 8-15 eggs after ovarian hyperstimulation so that some of them are genetically normal and perfectly matured.

When it comes to fertility care, you deserve only the best. At CNY Fertility, we empathize with you and understand how stressful it is to be dealing with infertility. That’s why we never treat our patients as numbers or nameless visitors. From the moment you enter our doors, you’ll be welcomed by our friendly staff and receive only high-quality, personalized care. We believe that fertility treatments aren’t a luxury reserved for a select few – It’s a human right that you wholeheartedly deserve, no matter your history or situation. 
The cost of an IUI is almost certainly less on a per cycle basis, but because IVF has much higher success rates and IUI is a poor option for some, the higher per cycle cost of IVF can actually be more affordable in the long run – in terms of the cost to bring home a baby.  Because most successful IUIs happen in the first three or four-cycle, it eventually becomes very expensive to bring home a baby with an IUI.
IVF success rates are the percentage of all IVF procedures that result in a favourable outcome. Depending on the type of calculation used, this outcome may represent the number of confirmed pregnancies, called the pregnancy rate, or the number of live births, called the live birth rate. The success rate depends on variable factors such as maternal age, cause of infertility, embryo status, reproductive history, and lifestyle factors.
Secondary infertility is similar to other types of infertility and shares many of the same signs. However, in secondary infertility you’re unable to conceive or carry a baby to full-term after having a previous successful pregnancy. Infertility can be caused by either the man or woman. Treatment options can include medications to induce ovulation, in vitro fertilization (IVF) or surgery.
Fertility is often something people do not consider until they are actively trying to start a family, or in many cases after they have started having trouble conceiving. What many don’t realize is that couples ages 29-33 with normal functioning reproductive systems only have a 20-25% chance of conceiving in any given month. Add in any number of infertility factors from either gender and those chances can decrease significantly.
Risk of ovarian hyperstimulation syndrome (OHSS). OHSS can happen when women respond too well to fertility drugs and produce too many eggs. About 10 to 20 percent of women who take gonadotropins develop a mild form of OHSS, a condition marked by weight gain and a full, bloated feeling. Some also have shortness of breath, dizziness, pelvic pain, nausea, and vomiting. If you have OHSS, your ovaries swell to several times the normal size and produce fluid that accumulates in your abdominal cavity. Normally this resolves itself with careful monitoring by a physician and bed rest. But in rare cases it's life threatening, and you may have to be hospitalized for more intensive monitoring or treatment.

^ Tersigni C, Castellani R, de Waure C, Fattorossi A, De Spirito M, Gasbarrini A, Scambia G, Di Simone N (2014). "Celiac disease and reproductive disorders: meta-analysis of epidemiologic associations and potential pathogenic mechanisms". Hum. Reprod. Update. 20 (4): 582–93. doi:10.1093/humupd/dmu007. PMID 24619876. Physicians should investigate women with unexplained infertility, recurrent miscarriage or IUGR for undiagnosed CD. (...) CD can present with several non-gastrointestinal symptoms and it may escape timely recognition. Thus, given the heterogeneity of clinical presentation, many atypical cases of CD go undiagnosed, leading to a risk of long-term complications. Among atypical symptoms of CD, disorders of fertility, such as delayed menarche, early menopause, amenorrhea or infertility, and pregnancy complications, such as recurrent abortions, intrauterine growth restriction (IUGR), small for gestational age (SGA) babies, low birthweight (LBW) babies or preterm deliveries, must be factored. (...) However, the risk is significantly reduced by a gluten-free diet. These patients should therefore be made aware of the potential negative effects of active CD also in terms of reproductive performances, and of the importance of a strict diet to ameliorate their health condition and reproductive health.
For women, intake of antioxidants (such as N-acetyl-cysteine, melatonin, vitamin A, vitamin C, vitamin E, folic acid, myo-inositol, zinc or selenium) has not been associated with a significantly increased live birth rate or clinical pregnancy rate in IVF according to Cochrane reviews.[30] The review found that oral antioxidants given to men in couples with male factor or unexplained subfertility may improve live birth rates, but more evidence is needed.[30]
Benign uterine growths are tissue enlargements of the female womb (uterus). Three types of benign uterine growths are uterine fibroids, adenomyosis, and uterine polyps. Symptoms include abdominal pressure and pain, pelvic pain, pain during intercourse, and pain during bowel movements. Diagnosis and treatment of benign uterine growths depends upon the type of growth.
The likelihood of a diagnosis of unexplained infertility is increased substantially in women 35 and over - and greatly increased in women over 38. The reason for this is that there are more likely to be egg quantity and quality problems as women age. Since we do not have a "standard category" called egg factor infertility, these couples sometimes get lumped in to the "unexplained" infertility category.

The stress of secondary infertility on an individual's life and relationships can be significant. It can be hard to find support from family and friends, especially when a woman or couple already has/have children. Sentiments such as, "you should be grateful for what you have," or, "just keep trying," almost never serve as useful advice or support. Couples and single parents can even experience resentment from other couples with infertility who are unable to even have their first child.
Statistically, the biggest decline in live births happens between the ages of 40 and 42+. In other words, a woman who has just turned 40 has a much higher chance of conceiving and delivering a baby than a woman who has just turned 42. Of course, these numbers and trends concern women using their own eggs. With donor eggs, consider the age of the woman at the time the eggs were harvested and use that age.

Acknowledge your feelings. When dealing with secondary infertility, it’s very common to feel shock or denial. After all, making one baby might have been a piece of cake for you, so you probably assumed that having a second one would be easy, too. Your friends and even your doctor may also downplay your current infertility problems (telling you not to take it so hard or to “just keep trying”) since you had no trouble before. But secondary infertility is much more common than most people realize. So allow yourself the chance to accept the idea that you may be battling secondary infertility — because once you do, you can tackle the problem head-on.

Deciding whether to undergo in vitro fertilization, and how to try if the first attempt is unsuccessful, is an incredibly complicated decision. The financial, physical, and emotional toll of this process can be difficult. Speak with your doctor extensively to determine what your best options are and if in vitro fertilization is the right path for you and your family. Seek a support group or counselor to help you and your partner through this process.


Egg retrieval and sperm collection – Egg retrieval happens 35 hours after the trigger shot. It is done under light anesthesia and takes just 5-10 minutes. During retrieval, a tiny hollow needle is pierced through the vaginal wall towards an ovary. At this point, the fluid that contains the developed eggs is drained from the follicles and immediately taken to the IVF laboratory, where they will be fertilized and developed. Sperm is collected the same day as the procedure by ejaculation into a sterile specimen container, frozen ahead of time, via a donor, or through more advanced sperm retrieval procedures. Next, the sperm is washed, placed in a solution similar to the fallopian tubes, and used for fertilization.

I had a wonderful experience at CHA Fertility Clinic and got pregnant on my first cycle.  My son will turn two this year and I immediately contacted them when we were thinking of having a second child.  The doctors and staff are so kind, informative, and helpful, and they really put my mind at ease.  We had looked at other fertility clinics … Read More
For example, untreated Celiac disease may in some cases of unexplained infertility. A 2016 reanalysis of previous research studies have found that Celiac disease may be diagnosed about six times more frequently in women with unexplained infertility compared to the general public. The study authors noted, however, that previous studies were small so it's hard to know exactly how accurate those odds are. In addition, it also appeared that women with any type of infertility were more likely to be diagnosed with celiac disease.
3-6 months of treatment with Clomid pills (clomiphene citrate) might improve fertility by as much as 2 times as compared to no treatment. This is a very low level infertility treatment. Infertility specialists do not usually recommend Clomid treatment( without insemination) for unexplained infertility for women over the age of about 35. Most fertility specialists do not use it (without IUI) on any couples with unexplained infertility. If a woman is already having regular periods and ovulating one egg every month, giving Clomid, which will probably stimulate the ovaries to release 2 or 3 eggs per month (instead of one) is not really fixing anything that is broken - and is not likely to be successful.
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