You may be well-informed about a variety of healthcare topics but there’s a good chance you’ve never heard of “secondary infertility.” It’s the inability to establish a clinical pregnancy after a previous pregnancy whether or not there was a live birth. While it may not be a mainstream topic, secondary infertility affects nearly three million couples, double the number from 1995. It also accounts for approximately one-third all visits to see a fertility specialist.
Secondary infertility is similar in many ways to primary infertility when a couple has been unable to get pregnant after a year of regular sex when not using birth control. However, with one child or more, this diagnosis creates unique challenges including a lack of social support and the complexity of already being a parent.
What Causes Secondary Infertility?
Many of the causes of secondary infertility are the same as for primary infertility. Age-related issues are a common reason, which also explains the increase in numbers because women are waiting longer to start having children. If they have a first child in their thirties and plan a second child a few years later, they may experience problems getting pregnant again. Fertility rates drop sharply as a woman ages and it is more difficult to get pregnant after the age of 35.
Many women and men don’t fully understand how much their fertility declines with age and are given a false sense of security through media coverage suggesting there’s a proliferation of older women giving birth. Left undisclosed is that these women almost always had in vitro fertilization (IVF) and likely used donor eggs from much younger women. Age-related decline in fertility is underscored by data from the Society for Assisted Reproductive Technology (SART) which shows the live birth rate per egg retrieval using assisted reproductive technology (ART) is 53.9% for women younger than age 35, 40.2% for age 35-37, 26.0% for age 38-40, 12.6% for age 41-42, and 3.9% for women older than age 42.
Older age is associated with increasing reproductive hormonal problems, thyroid disease, irregular ovulation and periods, infections that can scar fallopian tubes, fibroids or polyps of the uterus, endometriosis in the pelvis, adenomyosis of the uterus and weight gain. Even when these problems don’t occur, increasing age is always associated with a decreased quality or quantity of eggs. All of these are possible explanations for secondary infertility in women.
Problems achieving a second pregnancy may also be related to the first pregnancy, although this is not common. Scarring may result from a C-section (which occurs about 10% of the time) or there may be scarring of the uterus after a D&C following a miscarriage or placental complications. Other types of surgeries on the uterus may also have an impact.
With secondary infertility, more than one factor is often responsible. And, as with primary infertility, men may have a role. In fact, male infertility is the primary medical issue in about 25% of infertility cases, and a contributing factor another 25% of the time. A major reason for male infertility – approximately 50% – is a low sperm count. Up to 90% of male infertility cases are due to a combination of low sperm count, poor quality sperm, or both.
There are multiple explanations for a decline in sperm quality, quantity or delivery. An important one in secondary infertility is when the man is older along with his female partner. The usual causes of primary infertility can also result in secondary infertility. These include a distended vein around the testes, called a varicocele. Lifestyle and environmental factors can also make a difference. Sexually transmitted infections can cause epididymitis or other inflammation that reduces sperm function. Stress, being obese or overweight, abuse of alcohol or drugs, exposure to certain chemicals and/or excessive heat may have a negative effect. Elevated temperature exposure around the testicles can be related to a low sperm count. The temperature in the groin area should be a couple of degrees cooler than the rest of the body for optimum sperm function. Every degree above normal may result in a decline in sperm quality of about 40%. Exposure to excessive heat can result from a job (e.g. hot environment, sitting for prolonged periods), too much time in a hot tub, and even setting your laptop in your lap for long periods of time.
Chronic illness can also affect sperm. A thyroid condition can lower testosterone which affects sperm production. Importantly, secondary infertility for a woman may sometimes be associated with a new male partner who might have problems the first partner did not, including chromosomal damage from a genetic disorder.
For any woman, man or couple, other factors such as new medications, inadequate sleep, stress, poor diet or very high caffeine consumption (5 or more cups per day) may cause or contribute to secondary infertility.
How is Secondary Infertility Diagnosed?
Multiple factors are often responsible for secondary infertility and may be due to one or both partners, so the diagnosis of the condition needs to be comprehensive but efficient. A thorough evaluation is needed to identify the causal factors to determine the right treatment; this includes current health status, medical history and, especially, any medical events, health or life changes since getting pregnant before.
Women will be asked about their last pregnancy and any complications. Menstrual cycle history and duration of not using contraception are important. Blood tests will look at hormone levels associated with reproduction such as: AMH (antimüllerian hormone), a biomarker for ovarian reserve or fertility potential; TSH (thyroid stimulating hormone) and thyroid antibodies for thyroid problems; prolactin, a hormone that can block the hormones needed to trigger ovulation, if cycles are irregular; and sometimes progesterone to confirm ovulation. An ultrasound will look for antral follicle count that helps assess ovarian reserve, cysts in the ovaries, uterine problems such as fibroids or polyps or scarring inside the uterus, and whether the fallopian tubes are open, not blocked. Men should almost always have a semen analysis to test for number, motility, and shape of sperm, as well as other characteristics.
When Should You See a Specialist?
Recommendations for when to see a fertility specialist suggest that if you have frequent unprotected sex without becoming pregnant and are 35 or under, seek treatment after a year; over the age of 35 after 6 months, and if you’re 40 or older, after 3 months. However, if you know you have a problem with irregular menstrual cycles, heavy bleeding, hormone problems, obesity, fibroids, endometriosis, pelvic adhesions, sperm problems, difficulty having intercourse, or other health problems, see your gynecologist or a fertility specialist right away. It may be premature to begin treatment but it’s important to know what the situation is and what can be done about it so that you can be proactive about your care.
What are Treatment Options for Secondary Infertility?
As with primary infertility, treatment depends on the evaluation of test results and the prognosis for different possible treatments. If a woman is having problems with ovulation, treatment may include taking oral “fertility pills” to help produce regular ovulation and/or produce more eggs. If there are issues with the fallopian tubes such as scarring or other blockage issues, surgery may be recommended or IVF may be the most appropriate treatment. Surgical removal of endometriosis lesions can result in pregnancy rates of 20% to 80%, depending on the severity of the disease. IVF may be recommended for severe endometriosis, severe tubal damage or pelvic adhesions. Older patients or those with diminished ovarian reserve where the quality and quantity of eggs has decreased can use egg donors if that is an acceptable option. Women with severe uterine problems such as scarring or a congenital abnormality can build their family with a gestational carrier where another woman carries the implanted embryo if that is an acceptable option for them.
For male factor issues such as poor sperm quality, erectile dysfunction or other physiological issues, intrauterine insemination (IUI) or IVF may be recommended. When there’s been a prior vasectomy, a vasovasostomy or partial reversal (putting the ends of the sperm ducts back together) may be a good option. In cases where there are no sperm, a sperm donor with frozen sperm can be very successful if this is an acceptable option. And for all couples, the option of adoption can be very successful.
Challenges Unique to Secondary Infertility
RESOLVE, the National Infertility Association refers to secondary infertility as a “very isolating diagnosis…that comes with its own set of stigma and support needs.” When a couple already has one child, they often receive far less social support – if any – than couples facing primary infertility. They may be less likely to reach out for help and support. Since there are others also facing the same complex feelings that come with secondary infertility, RESOLVE recommends finding a support group or mental health professional with a focus on this problem.
RESOLVE offers advice for all couples facing infertility who must deal with questions and insensitive comments from others. Among other things, they recommend preparing answers in advance to common questions such as “When are you having another baby?”
Feelings of sadness, anger or frustration are common with any infertility diagnosis, but already being a parent can add complexity. Couples may feel guilty at being unable to give their child a sibling and worry about the impact of spending time and money trying for a second child. Some experts advise establishing a plan including timeline, how much money you’re willing to spend and what treatments you’re willing to try such as IVF or egg donation. All these decisions are important because they affect the entire family.
Receiving a diagnosis of secondary infertility and seeking treatment is a challenge. One of the most difficult issues may well be how to live in the moment and enjoy the child you have. While you probably can’t avoid wondering and worrying if you can add another sibling, living for now is important no matter how many children you have.