What Is Secondary Infertility?
Having conceived successfully in the past does not always mean that getting pregnant again will happen easily. Secondary infertility refers to difficulty conceiving after a previous pregnancy. It may develop because fertility can change over time due to age, ovulation problems, changes in ovarian reserve, conditions affecting the uterus or fallopian tubes, sperm-related factors or other health concerns.
For couples experiencing difficulty getting pregnant again, identifying the underlying reason is an important first step. A fertility assessment can evaluate both partners and help determine whether natural conception remains possible or whether medical or assisted reproductive treatment may be helpful.
What Is Secondary Infertility?
What is secondary infertility? It describes difficulty achieving another pregnancy after previously conceiving and having had a pregnancy.
This differs from primary infertility, where a couple has never previously achieved pregnancy.
The key point is that previous fertility does not guarantee that reproductive health will remain unchanged. Several years may have passed since the first pregnancy, and during that time:
- female age may have increased
- ovarian reserve may have declined
- ovulation patterns may have changed
- conditions such as endometriosis or fibroids may have developed
- fallopian tube problems may have occurred
- sperm concentration, motility or other male fertility factors may have changed
Some couples assume that because they conceived their first child naturally, they should be able to conceive again in the same way. However, fertility can change for either partner.
So, when considering what is secondary infertility, it is useful to look at the current reproductive health of both partners rather than relying on what happened during the previous pregnancy.
Secondary Infertility Causes
There is no single explanation for difficulty conceiving after having a child.
The possible secondary infertility causes are often similar to those involved in primary infertility.
Increasing Female Age
Age is one of the important factors affecting female fertility.
As women get older, both the number of available eggs and their reproductive potential generally decline. This means a woman who conceived relatively easily several years ago may find pregnancy takes longer later.
The effect of age becomes increasingly relevant from the mid-30s onward.
Age-related fertility changes can influence:
- ovarian reserve
- egg quality
- fertilisation
- embryo development
- miscarriage risk
This makes age one of the common secondary infertility causes, especially when several years have passed since the previous pregnancy.
Changes in Ovarian Reserve
Ovarian reserve refers to the remaining supply of eggs in the ovaries.
It naturally declines with age but can also vary considerably between women of the same age.
A previous pregnancy does not prevent ovarian reserve from decreasing over time.
Fertility specialists may assess ovarian reserve using clinical history, ultrasound and blood tests where appropriate. These tests help estimate how the ovaries may respond to fertility treatment but do not directly measure whether an individual egg is capable of producing a healthy pregnancy.
Ovulation Problems
Irregular or absent ovulation can make conception difficult.
Possible reasons include:
- PCOS
- thyroid disorders
- significant weight changes
- hormonal disturbances
- perimenopausal changes
- other medical conditions
A woman who previously had regular cycles may later develop irregular periods, which can reduce the number of opportunities for conception.
Ovulatory problems are therefore another important group of secondary infertility causes.
Fallopian Tube Problems
For natural conception to occur, sperm and egg generally need to meet within a functioning fallopian tube.
Damage or blockage may develop because of:
- pelvic inflammatory disease
- previous pelvic infections
- pelvic or abdominal surgery
- endometriosis
- scar tissue
Tubal problems may occur after a previous pregnancy and may not always cause obvious symptoms.
Uterine Conditions
Changes within the uterus can sometimes affect conception or implantation.
These may include:
- fibroids
- endometrial polyps
- intrauterine adhesions
- other abnormalities of the uterine cavity
Not every fibroid or uterine finding causes infertility. Its relevance depends on size, location and how it affects the uterine cavity.
Endometriosis
Endometriosis can develop or progress over time.
It may affect fertility through inflammation, adhesions, ovarian involvement or changes around the fallopian tubes.
Some women experience:
- painful periods
- pelvic pain
- painful intercourse
- pain during bowel movements
- difficulty conceiving
Others have few symptoms.
Male Fertility Factors
Male reproductive health can also change.
Possible factors include:
- reduced sperm concentration
- lower sperm motility
- changes in sperm morphology
- varicocele
- hormonal conditions
- certain illnesses or medications
- smoking
- significant weight changes
- environmental or occupational exposures
This is why evaluation of secondary infertility causes should involve both partners rather than focusing only on the woman.
Health and Lifestyle Changes
Changes in general health since the previous pregnancy can influence fertility.
Examples include:
- significant weight gain or loss
- smoking
- heavy alcohol use
- metabolic conditions
- poor sleep
- certain chronic illnesses
- medications that affect reproductive function
Lifestyle factors are not always the primary cause, but they may contribute to overall reproductive health.
Secondary Infertility Symptoms
There may be no specific secondary infertility symptoms other than being unable to conceive again despite regular attempts.
However, certain symptoms may point toward an underlying fertility issue.
These can include:
- irregular or absent menstrual cycles
- periods becoming significantly heavier
- severe or worsening period pain
- pelvic pain
- pain during intercourse
- unusual menstrual changes
- symptoms of hormonal imbalance
- erectile or ejaculation difficulties
- changes in sexual function
Some causes produce no noticeable symptoms at all.
For example, reduced ovarian reserve, tubal blockage or changes in sperm parameters may not cause day-to-day symptoms.
This is why difficulty getting pregnant again should not be judged only by how healthy either partner feels.
How Is Secondary Infertility Diagnosed?
The evaluation is generally tailored to the couple’s age, reproductive history, menstrual pattern and how long they have been trying to conceive.
Both partners should usually be assessed.
Medical and Reproductive History
The fertility specialist may ask about:
- previous pregnancies
- previous fertility treatment
- menstrual regularity
- pregnancy or delivery complications
- previous surgeries
- infections
- medical conditions
- medications
- lifestyle factors
How much time has passed since the previous pregnancy can also be relevant.
Ovulation Assessment
Menstrual history can provide useful information about whether ovulation is occurring regularly.
Depending on the situation, additional hormonal testing or ultrasound monitoring may be recommended.
Ovarian Reserve Assessment
Testing may include blood tests and ultrasound to estimate ovarian reserve.
These findings are interpreted alongside age and the rest of the fertility evaluation.
Assessment of the Uterus and Fallopian Tubes
Ultrasound may be used to evaluate:
- uterus
- ovaries
- fibroids
- ovarian cysts
- other pelvic abnormalities
Additional testing may be recommended if the fertility specialist needs to assess whether the fallopian tubes are open or whether the uterine cavity is normal.
Semen Analysis
Male evaluation commonly includes semen analysis.
This assesses factors such as:
- sperm concentration
- motility
- morphology
- semen volume
Even when the male partner previously contributed to a natural pregnancy, sperm parameters may have changed since then.
Treatment Options for Secondary Infertility
The appropriate treatment for secondary infertility depends on what the evaluation identifies.
There is no single treatment that applies to every couple.
Lifestyle and General Health Measures
Where relevant, recommendations may include:
- maintaining a healthy weight
- eating a balanced diet
- staying physically active
- avoiding smoking
- limiting alcohol
- managing chronic health conditions
- reviewing medications
These steps support general reproductive health but cannot correct every cause of infertility.
Ovulation Treatment
If irregular or absent ovulation is identified, the fertility specialist may recommend treatment to support or induce ovulation.
The medication and monitoring strategy depend on the underlying diagnosis and individual response.
Treatment of Underlying Reproductive Conditions
Some couples may need treatment for conditions such as:
- fibroids
- endometriosis
- hormonal disorders
- uterine abnormalities
Whether treatment is necessary depends on how strongly the condition is thought to be affecting fertility.
IUI
IUI treatment may be considered in selected couples depending on:
- ovulation
- sperm findings
- fallopian tube health
- age
- duration of infertility
IUI involves placing prepared sperm into the uterus around the time of ovulation.
IVF
IVF treatment may be considered when there are tubal problems, significant male-factor infertility, reduced ovarian reserve, prolonged infertility, unsuccessful simpler treatments or other clinical reasons.
During IVF, eggs are collected from the ovaries and fertilised in the laboratory. Suitable embryos can then be transferred to the uterus.
The most appropriate secondary infertility treatment depends on the couple’s complete fertility picture rather than simply the fact that they have conceived before.
When Should You See a Fertility Specialist?
Do not assume that difficulty conceiving again should simply be ignored because a previous pregnancy occurred naturally.
In general, fertility evaluation may be considered after:
- about 12 months of regular unprotected intercourse for women under 35
- about 6 months for women aged 35 or older
Evaluation may be appropriate sooner when there are known concerns such as:
- irregular or absent periods
- suspected endometriosis
- previous pelvic infection
- previous pelvic surgery
- known sperm problems
- significant reproductive health conditions
Women over 40 may also benefit from seeking fertility advice more promptly.
At Motherhood Fertility & IVF, evaluation can consider both partners and help determine whether continued natural attempts, IUI, IVF or another treatment approach is appropriate.
Frequently Asked Questions
What are the main secondary infertility causes?
Common causes include age-related fertility changes, reduced ovarian reserve, irregular ovulation, endometriosis, fibroids, fallopian tube problems and changes in sperm concentration or quality. Medical conditions and lifestyle changes may also contribute. Because several factors can coexist, fertility evaluation usually includes both partners rather than assuming the cause is the same as during the first pregnancy.
Can secondary infertility be treated successfully?
Treatment is possible in many cases, but outcomes depend on the underlying cause, female age, ovarian reserve, sperm health and other reproductive factors. Options may include lifestyle measures, ovulation treatment, management of reproductive conditions, IUI or IVF. A fertility evaluation helps determine which approach is most appropriate for the couple.
Is age a major factor in secondary infertility?
Yes, age can be important, particularly when several years have passed since the previous pregnancy. Female fertility generally declines with increasing age because ovarian reserve and egg quality change over time. Male fertility may also change with age, although usually less predictably. Age should therefore be considered alongside other fertility factors.
Can you conceive naturally after secondary infertility?
Yes. Natural conception may still occur, depending on the cause and severity of the fertility problem. Some couples may simply take longer, while others benefit from medical support. If conception is taking longer than expected, an evaluation can help identify whether continued natural attempts or fertility treatment is more appropriate.
If you are having difficulty conceiving after a previous pregnancy, you can consult a fertility specialist at Motherhood Fertility & IVF. Call 080 6723 8900, email info@motherhoodivf.com, or book an appointment.