Women’s Health · Fibroids

Monitoring Fibroids — When Watching Is the Right Plan

Most fibroids need no treatment at all. Here is who benefits from monitoring, what a follow-up scan measures, and when watching should stop.

Woman writing in a health diary at a sunlit desk

Fibroids are benign growths of the womb muscle, and they are extremely common — many women have them without ever knowing. Whether yours need anything doing depends far less on their existence than on two things: whether they cause symptoms, and where they sit.

That second point does most of the work. A small fibroid bulging into the womb cavity can cause heavier bleeding than a much larger one in the outer wall. Size alone is a poor guide, which is why a good report describes position, not just measurements.

Who Needs It

Who actually benefits from monitoring

Your situation Is monitoring useful?
Fibroids found incidentally, no symptoms Usually not routinely — most need nothing unless symptoms develop
Heavy bleeding, pressure or pain being managed without surgery Yes — tracking size and position helps judge whether the plan is working
Planning pregnancy or fertility treatment Often — position relative to the cavity matters for implantation and for treatment planning
Before or after a procedure such as embolisation or myomectomy Yes — your specialist will usually set the schedule
Approaching or past menopause Fibroids usually shrink after menopause — monitoring often stops. New growth after menopause needs assessment

Do not wait for a scheduled scan if things change

See your GP promptly if bleeding becomes much heavier or you develop symptoms of anaemia, if a fibroid appears to grow quickly, or if you have any bleeding after menopause — that always needs assessment, whatever your fibroid history. Severe sudden pelvic pain with fever or faintness needs same-day care.

Honestly

What monitoring is for — and what it is not

Monitoring exists to inform decisions, not to collect numbers. Before booking a repeat scan, the useful question is: what would a change in the measurement actually cause me to do differently? If the answer is nothing, the scan can usually wait.

Two things are worth saying plainly. Fibroids growing slowly over years is normal behaviour for fibroids — growth in itself is not alarming, particularly during the reproductive years. And the symptoms matter more than the size: a stable fibroid causing miserable periods needs a treatment conversation, while a growing one causing nothing at all often needs only observation.

The exception worth knowing about: rapid growth after menopause, when fibroids should be shrinking, is the pattern that prompts closer assessment. It is uncommon, and it is the reason post-menopausal change is treated differently from the same change at 35.

At IUS London

What a follow-up scan measures

  1. 1
    Bring your previous reportMonitoring is comparison. Previous measurements make the scan far more useful. 30 minutes, no referral needed.
  2. 2
    The scanA transvaginal scan gives the clearest view of the womb and the fibroids’ relationship to the cavity; transabdominal is available if you prefer, and is often needed as well for large fibroids.
  3. 3
    What we documentEach significant fibroid measured in three dimensions with its position classified relative to the cavity and wall, overall womb size, the endometrial thickness, and both ovaries.
  4. 4
    ResultsExplained on screen as we scan, with the written report usually within two hours — set out so your GP or gynaecologist can compare directly against your last scan.
FAQs

Your questions answered

How often should fibroids be scanned?
There is no universal interval. Symptom-free fibroids often need no routine follow-up at all; those being managed for symptoms, or before and after a procedure, are usually scanned to a schedule your gynaecologist sets. If a scan would not change anything, it can generally wait.
Do fibroids turn into cancer?
Malignant change is very rare. The pattern that prompts closer assessment is rapid growth after menopause, when fibroids would normally be shrinking — which is why post-menopausal change is taken more seriously than growth at 35.
Will they shrink after menopause?
Usually yes — fibroids are hormone-dependent and typically shrink once oestrogen levels fall, with symptoms easing accordingly. Monitoring often stops at that point.
Do fibroids affect fertility?
It depends on position. Those distorting the cavity are the ones most associated with difficulty conceiving and with treatment outcomes; fibroids in the outer wall often have no effect. That is why the report specifies position rather than only size.
Can a scan tell me if I need surgery?
It provides the anatomy those decisions rest on — number, size, position. Whether to treat, and how, is a conversation with your gynaecologist that weighs your symptoms and your plans alongside the images.
Why does the measurement differ slightly from last time?
Small variation between operators and machines is normal. That is why meaningful change is judged over a series rather than between two individual numbers — and why bringing your previous report matters.
Related

Where to go from here

SymptomsHeavy Periods — Causes

What counts as heavy, and what a scan can find.

Read the guide →SymptomsPelvic Pain — When to Scan

What the pattern of pain suggests and when it is urgent.

Read the guide →After MenopausePostmenopausal Bleeding

Why it always needs checking, and what the scan measures.

Read the guide →

Position documented, not just size

Every significant fibroid measured and classified by position relative to the cavity, with womb size, lining and both ovaries — explained on screen as we scan, report usually within two hours.

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Pelvic scan

Pelvic scan

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Kensington, London W8 4ED
3 mins from Notting Hill Gate

This article is general information about fibroid monitoring, not individual medical advice. Follow the plan your GP or gynaecologist has set, and see them promptly if bleeding worsens or you have any bleeding after menopause — see NHS guidance on fibroids and heavy periods.

Written and clinically reviewed by the HCPC-registered sonographers who perform this scan at IUS London — a CQC-registered diagnostic ultrasound clinic (Provider ID 1-2775844974). Your own findings are explained to you at the scan and set out in your report.

Author: Yianni Kiromitis, Senior Sonographer, HCPC RA38415 — over 20 years’ experience in NHS and private ultrasound
Medically reviewed: 9 August 2026