What is Asherman's syndrome?
Asherman's syndrome is a condition in which scar tissue — called adhesions or synechiae — forms inside the uterine cavity. This scar tissue can be thin and filmy, or dense and fibrous. It can partly line the walls, bridge across the cavity, or in severe cases, block the cavity almost entirely. The endometrium, the lining of your uterus that builds and sheds each cycle, becomes disrupted — and sometimes permanently altered — by this scarring process.
The adhesions form when the inner lining of the uterus is damaged, usually by a medical procedure. The body responds to that injury by trying to heal — but instead of the endometrium regenerating cleanly, scar tissue forms between the uterine walls, sticking them together in places they should remain free.
Who gets Asherman's?
The most common trigger is a D&C (dilation and curettage) — a procedure that removes tissue from inside the uterus. This includes procedures after miscarriage, termination of pregnancy, treatment of retained placenta, or postpartum complications. The risk is higher when a D&C is performed on a recently pregnant uterus (including immediately after delivery), when multiple procedures are performed, or when there is concurrent infection.
Other causes include:
- Hysteroscopy — particularly operative hysteroscopy to remove fibroids or polyps
- Myomectomy — surgical removal of fibroids, especially when the uterine cavity is entered
- Caesarean section — in some cases the uterine incision can lead to adhesions near the lower segment
- Postpartum haemorrhage treatment — aggressive curettage to control bleeding after birth carries a particularly high risk
- Uterine infection — endometritis (infection of the uterine lining), including tuberculosis in some regions, can cause scarring without any procedure
How common is it?
These numbers tell us something important: Asherman's is not vanishingly rare. It sits quietly in a significant percentage of women experiencing fertility difficulties — yet it is rarely the first condition investigated.
The symptoms — what to look for
Light or absent periods (hypomenorrhea / amenorrhea)
The most common and most telling symptom. If your period was normal before a procedure and becomes very light, brown or "old blood" in appearance, short in duration, or stops entirely, this is a significant signal. The endometrium has been compromised — either it can no longer build properly, or the blood cannot exit because adhesions are obstructing the cervical canal or lower uterine segment.
Cyclic pelvic pain with no visible bleed
Your body still goes through the hormonal cycle. Oestrogen rises, the endometrium responds (or tries to), and progesterone falls. But if adhesions are sealing the uterine cavity, the blood that should be shed has nowhere to go. You feel the cycle — cramping, heaviness, that familiar pre-menstrual feeling — but nothing, or almost nothing, comes out. This is called cryptomenorrhoea, and it can be genuinely painful. I experienced this myself, and it is one of the most disorienting feelings: all the sensations of a period, with none of the bleed.
Recurrent miscarriage
Adhesions can prevent proper implantation by disrupting the endometrial lining, or interfere with placentation as a pregnancy grows. Women who experience two or more miscarriages should always have intrauterine adhesions investigated as a potential cause, particularly if any pregnancy loss was followed by a D&C.
Difficulty conceiving (uterine factor infertility)
Even moderate adhesions that do not cause obvious period changes can reduce fertility by affecting the environment into which an embryo needs to implant. If you are struggling to conceive and other factors have been ruled out, Asherman's should be part of the conversation — not left to the end of the list.
Normal hormone levels but no period
This is one of the most clinically useful markers. When periods are absent and the working assumption is a hormonal cause, blood tests are usually run first. In Asherman's, FSH, LH, oestradiol, and thyroid function are typically normal — because the ovaries are fine. The uterus is the problem. A normal hormone panel combined with absent periods, especially after a procedure, should immediately raise suspicion for intrauterine adhesions.
Pain during what should be your period
Even if you are not experiencing full cryptomenorrhoea, cramping at expected cycle times — without a corresponding bleed, or with only very light spotting — is worth noting and worth raising with a doctor. Your body is cycling. Something is stopping the flow.
The ones nobody talks about
Medical literature covers the "official" symptoms: amenorrhea, hypomenorrhea, pain, infertility. What it rarely captures are the subtler, harder-to-articulate experiences that women describe — the ones that don't make it onto symptom lists but are just as real.
- A feeling of being "off" in your body that you cannot put words to — a vague wrongness, a disconnect
- Breast tenderness, bloating, and cramping arriving on schedule — but no bleed following them, or only a trace
- A sense of emotional flatness or disconnection from your reproductive body — as though that part of you has gone quiet
- Very light spotting that starts and then stops abruptly within a day, as though something switched off
- A strong felt sense that something has changed since a procedure — an internal knowing that preceded any test result, any confirmation, any diagnosis
That last one matters. The instinct that something is different is valid data. It is the kind of knowledge that lives in your body before it shows up in any scan. I want you to trust it.
"I knew something was wrong before any test confirmed it. I kept being told everything was normal. That experience of being dismissed while you know your own body is one of the most difficult parts of this condition."
The gap between knowing and being believed is one of the most isolating parts of Asherman's. Most women I have spoken to describe it the same way: they knew, they were dismissed, they persisted, and eventually they were right. The journey to diagnosis can be long — but getting there is possible, and you should not stop pushing until you have answers.
Why Asherman's is missed so often
Understanding why this condition is so frequently overlooked can help you navigate the system more effectively. There are several distinct reasons it slips through.
Standard examinations cannot detect it
A pelvic examination tells a doctor about the size, position, and external appearance of the uterus and cervix. It cannot show what is happening inside the uterine cavity. A standard transvaginal ultrasound may suggest something is wrong — but a sensitivity of around 75% means it misses a significant proportion of cases. Routine blood tests, cervical smears, and even many imaging investigations will return completely normal results in a woman with active intrauterine adhesions. The only way to definitively see adhesions is to look directly inside the uterus — something that requires specific procedures that are not part of routine gynaecological care.
Symptom overlap with other conditions
The symptoms of Asherman's — light or absent periods, pelvic pain, infertility — overlap substantially with PCOS, thyroid dysfunction, premature ovarian insufficiency, hypothalamic amenorrhea, and cervical stenosis. Doctors will, reasonably, investigate the more common causes first. The problem is when Asherman's is never added to that list of possibilities, particularly after a uterine procedure.
Women often don't realise the change is abnormal
Post-procedure changes to periods can feel expected, not alarming. After a miscarriage and D&C, after birth, after a termination — your body has been through something significant. A lighter period feels like it might be part of recovery. Breastfeeding masks the return of periods entirely. Many women wait months before realising that what they assumed was temporary has become their new normal — and by that point, the window for early intervention has passed.
Doctors may not ask the right questions
Routine post-procedure care rarely includes questions about menstrual changes. The link between "I had a D&C three months ago" and "my periods have been very light since" is not always made — particularly in primary care settings where time is limited and Asherman's may not be front of mind. As the Mayo Clinic noted in 2024, time-to-diagnosis for Asherman's syndrome remains poorly studied and highly variable.
- Standard pelvic exams and blood tests cannot detect intrauterine adhesions
- Routine ultrasound has approximately 75% sensitivity — missing 1 in 4 cases
- Symptoms overlap with PCOS, thyroid conditions, premature menopause and other diagnoses
- Post-procedure period changes are assumed to be temporary recovery
- Breastfeeding masks absent periods for months after a postpartum D&C
- There is no standard post-procedure screening for Asherman's in most healthcare systems
When to seek help — and how to advocate for yourself
Knowing something is wrong is not enough. You also need practical guidance on what to do with that knowing — how to translate it into a conversation with a doctor that actually leads somewhere. This section is deliberately actionable.
When to see a gynaecologist
- Your period changes significantly after any uterine procedure — lighter, shorter, darker, more painful, or absent
- You experience cyclic pelvic pain at the expected time of your period, but bleed very little or not at all
- You have had two or more miscarriages
- You are struggling to conceive and have had any previous procedure inside the uterus
- You have been told your hormones are normal but your period has not returned after a procedure
What to say at the appointment
Bring the specifics. What procedure did you have, and when? What was your period like before, and what has it been like since? How many cycles have passed? Write it down if that helps you — doctors respond well to precise timelines. And then say, clearly: "I'd like to discuss whether intrauterine adhesions could explain my symptoms."
That phrase matters. It names the condition. It signals that you have done your research. It frames the conversation before it can be redirected toward more familiar territory.
What to ask for
- "Would a saline infusion sonography (SIS) be appropriate in my case?" — SIS uses fluid to expand the cavity and makes adhesions visible on ultrasound, with better sensitivity than standard scanning
- "Could we discuss diagnostic hysteroscopy?" — the gold-standard investigation; the only way to directly visualise the cavity
- If hormonal causes are being investigated: "Could we also do an oestrogen-progesterone challenge test?"
The oestrogen-progesterone challenge test
This is one of the most clinically useful tests in this context. You are given a course of oestrogen followed by progesterone. In a woman with a responsive endometrium, this should reliably trigger a withdrawal bleed. If no bleed occurs despite normal hormone levels, this strongly suggests that the endometrium is either absent or non-functional — which points to intrauterine adhesions. It is not a definitive diagnostic test (that remains hysteroscopy), but a failed challenge in a woman with normal hormones and a history of uterine procedures is a significant indicator.
I wish someone had given me this chapter when I was still in the "something is wrong but I can't prove it" stage. Everything that follows in this guide is built on the foundation of being taken seriously — and being taken seriously often starts with you. The next chapter covers what comes next: the diagnostic process, the tests, and how to find a specialist who will give Asherman's the attention it deserves.