The short explanation
Any bleeding after twelve months without a period needs investigating, always, and reasonably quickly. Most of the time the cause turns out to be benign — thinning of the lining, a polyp, or vaginal dryness — but it is also the main symptom of endometrial cancer, which is very treatable when found early and much less so when it is not. It is not something to watch for a few months.
What depends on your situation
The parts of this that change from woman to woman. Uncertainty is stated, not hidden.
- The usual assessment is an examination and an ultrasound to measure the lining, sometimes followed by a sample of the lining taken in clinic. Being on HRT, or on tamoxifen, changes how it is interpreted rather than making it less worth checking.
What this answer cannot determine
The boundary of online education. These need a clinician who can see you.
- This cannot tell you the cause, and the amount of bleeding does not indicate how serious it is — a single episode of spotting is investigated the same way as heavier bleeding.
Questions for your clinician
Take these with you. You can add any of them to an appointment card.
- How soon can I be seen, and on what pathway?
- Will I need a scan, a biopsy, or both?
- Does my HRT change how this is interpreted?
- When and how will I get the results?
When to seek help
Clinician-approved guidance for this topic. When in doubt, being seen is never the wrong choice.
- Go sooner for heavy bleeding, bleeding with pain, or bleeding with weight loss. Do not wait to see whether it happens again.
Sources
The evidence this explanation is built on.
No sources recorded yet.
Who wrote and reviewed this
Every AskHer answer names its author. A clinically reviewed answer also names the clinician who signed it off — if no clinician is named below, it has not been clinically reviewed.
- Author
- AskHer Editorial AskHer's editorial team — not an individual clinician Works in English, தமிழ், हिन्दी
- Clinical reviewer
- Nobody yet No clinician has signed this answer off. That is what the “Editorially reviewed” badge means, and why it does not say “Clinically reviewed”. It was written and checked by AskHer’s editorial team, and it is queued for a clinician who works in this area. No sources are recorded against it yet.
- Review status
- Editorially reviewed
- Last reviewed
- Last reviewed 25 September 2026
- Version
- 1
Correction history
Substantive changes are listed, not quietly edited away.
No corrections have been made since this answer was first published.
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