Secondary Infertility

By RRM Academy Reviewed by Dr. Naomi Whittaker, MD, Board-Certified OBGYN, MIGS, NFPMC, FCI Updated May 13, 2026

Secondary infertility is the inability to conceive after 12 months of regular, unprotected intercourse (or 6 months for women 35 or older) in a couple who has previously achieved at least one pregnancy, regardless of the outcome of that prior pregnancy. It is more common than many clinicians acknowledge. And it is too often met with the worst possible clinical response: reassurance that prior success means nothing is wrong.

Something has changed. New conditions arise after a first pregnancy. Cesarean section creates a uterine scar; a niche or isthmocele at the scar can impair implantation and cause secondary infertility, a finding confirmed by endoscopic repair restoring conception in affected patients.¹ Operative delivery or retained products of conception can cause intrauterine adhesions consistent with Asherman's syndrome. Postpartum thyroiditis, occurring in up to 10% of postpartum women, can produce persistent hypothyroidism that goes undetected until it is framed as the cause of secondary infertility. Endometriosis can develop or progress between pregnancies. Male factor can change: varicocele, illness, and hormonal shifts all affect semen parameters over time.

RRM approaches secondary infertility as a fresh clinical question rather than a continuation of the prior one. The diagnostic picture from a prior conception does not carry forward unchanged, and reassurance based on prior success can delay the workup that would identify what has changed. The couple presenting today may have a different underlying pathology than the couple who conceived two years ago.²

The infertility is real. The evaluation should be, too.

This content is for educational purposes only and does not constitute medical advice. Consult an RRM clinician or healthcare provider for guidance specific to your situation.