Secondary infertility
Secondary infertility means difficulty conceiving after having previously had a child. It is common, and it is frequently under-taken-seriously — by clinicians, by family, and by the couple themselves.
It is not a lesser problem
Having conceived before does not mean nothing has changed, and it does not make the current difficulty easier to bear. Many people describe secondary infertility as isolating precisely because the difficulty is invisible to others and their own grief feels unentitled.
If you are struggling, that is legitimate.
What can have changed
Age. Often the largest single factor. Fertility declines with age, and the interval since your last pregnancy may be several years.
A new factor since the last pregnancy — tubal damage from infection, which is frequently asymptomatic; endometriosis progressing; a uterine problem such as adhesions following a previous delivery or procedure; or weight change.
Male factor. Sperm parameters change over time. A man who fathered a child previously can have a significantly abnormal analysis now — testosterone use, illness, weight gain, or simply age. This is routinely overlooked on the assumption that fertility was proven.
Complications from the previous pregnancy or delivery — including intrauterine adhesions, particularly after retained placenta or instrumentation.
Conditions that developed since — thyroid dysfunction, raised prolactin, PCOS becoming more symptomatic.
The assessment is the same
Do not accept a lower level of investigation because you have conceived before. The thresholds are identical: 12 months, or 6 months if you are 35 or over, sooner with irregular cycles, two or more miscarriages, or any known concern.
Both partners assessed together. A semen analysis should be arranged even though he has fathered a child — this is the single most commonly skipped test in secondary infertility.
Expect ovulation assessment, ovarian reserve testing, pelvic ultrasound, and tubal assessment where there is reason to suspect damage.
One thing worth mentioning specifically
If you had a retained placenta, a postpartum curettage, or heavy bleeding requiring intervention, mention it. Intrauterine adhesions can follow, and a marked reduction in menstrual flow since is the typical clue.
The emotional part
Guilt is common — that you should be grateful, that wanting another child is greedy. It is neither. And existing children can make treatment logistically harder while making the difficulty harder to discuss.
Fertility counselling exists for this too.
Frequently Asked Questions
Is secondary infertility common?▾
Yes — it affects approximately 1 in 8 couples who have already had a child, accounting for nearly half of all global infertility (WHO 2023). It is often underrecognised because people assume past fertility guarantees future fertility. Age, new medical conditions, and complications from previous pregnancies can all significantly affect fertility.
What causes secondary infertility after C-section?▾
C-section can contribute to secondary infertility through: uterine scar niche formation (impairs endometrial function), increased risk of Asherman's syndrome if D&C was also performed, and higher prevalence of adenomyosis after uterine surgery. Any woman with secondary infertility and a history of C-section should have a uterine cavity assessment (SIS or hysteroscopy).
Should I see a doctor about secondary infertility?▾
Yes — apply the same time-based guidelines as primary infertility: under 35 try for 12 months, 35–39 seek evaluation after 6 months, 40+ immediately. Do not assume that having conceived before means everything is still normal. Age-related egg quality decline and new anatomical changes are common causes that require medical evaluation.