Secondary Infertility: Causes, Workup, and Why Your Experience Deserves a Full Evaluation

Secondary infertility is still infertility. Covers common causes, when to seek help, the workup, and how to advocate if you're dismissed.

PLUSReviewed: 2026-04-19

You've had a baby before. Getting pregnant again has been harder — or hasn't happened. This has a name, it's more common than people realize, and the evaluation shouldn't be any less thorough than for anyone else. This page covers what secondary infertility is, what can cause it, and how to make sure your workup actually matches what your body is telling you.

What is secondary infertility?

Secondary infertility is the inability to conceive or carry a pregnancy to term after previously having a child. The hardest part for many people is being told "at least you already have one" — but secondary infertility is still infertility. The grief is real, and the workup should be the same as for anyone who's been trying without a prior pregnancy.

What causes secondary infertility after a previous pregnancy?

Age is the single most common factor. Ovarian reserve and egg quality declined between your first pregnancy and now — that's biology, not something you did wrong. New male-factor issues can also develop, including testosterone changes, varicocele, illness, or new medications; sperm quality can shift over months or years, so a prior pregnancy doesn't rule out a current male-factor contribution. And things can change structurally or hormonally after a first pregnancy: scarring from a C-section or D&C, retained placental tissue, new thyroid dysfunction, progressing endometriosis, or emerging PCOS. None of this is rare.

How common is secondary infertility?

Secondary infertility affects roughly 1 in 10 couples — and is often underdiagnosed because people delay getting help. Part of that delay is the assumption that if conception happened once, it'll happen again without much effort; part of it is how often concerns are minimized when there's already a child at home. Both are reasons the actual number is likely under-counted.

How long before secondary infertility should be formally evaluated?

The timeline to seek help is the same as for primary infertility: 6 months of trying if you're 35 or older, 12 months if under 35. Don't wait longer just because you conceived before. A prior pregnancy isn't a guarantee about this cycle or this year — the clock runs the same way, and the sooner a workup starts, the more options tend to be on the table.

Does age play a bigger role in secondary infertility than in primary infertility?

Age is the single most common factor in secondary infertility. Whatever your ovarian reserve and egg quality were when you conceived before, both have changed since — and for many people, the time between a first pregnancy and actively trying again is measured in years, not months. That's simply biology; it isn't something you caused, and it isn't a reflection of how hard you've tried.

What workup is done for secondary infertility?

The evaluation should be a full workup, not a wait-and-see. Same diagnosis, same workup as primary infertility — a repeat semen analysis (even if your partner was "fine" the first time), hormone testing, a look at the uterine cavity, and a check for any new structural, thyroid, or hormonal issues that can emerge after a first pregnancy. If any of those come back abnormal, the next steps follow from what the results actually show.