What size fibroid needs treatment?

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1. Does the size of a fibroid decide whether I need treatment?

   Fibroids can range from microscopic to very large, and size by itself does not decide whether you need treatment. If your fibroids are not causing symptoms, you may not need treatment^3,4.

2. What do doctors weigh besides size?

   Doctors consider your symptoms, your fibroid's size and location, and your age together, not size on its own⁴. Location can matter for specific goals: a 2017 US fertility-society guideline says myomectomy "may be considered" for fibroids that distort the uterine cavity, even without symptoms, to improve pregnancy outcomes, which is part of why cavity-distorting fibroids come up in fertility conversations⁵. For the location types doctors use, see FIGO fibroid types.

3. Is there a size that's considered "too big" or dangerous?

   No source cited here gives a size that makes a fibroid "too big" or dangerous on its own. Ask your doctor how your fibroid's size, together with your symptoms and goals, is being weighed in your case.

4. Can I just monitor my fibroids instead of treating them now?

   Watching and waiting is a recognized option. It usually means follow-up exams and ultrasounds rather than immediate treatment³. Read non-surgical fibroid treatment for more on what monitoring involves and the other options that keep the uterus.

5. How fast do fibroids usually grow?

   Fibroids do not all grow at the same rate. In one study of 72 women and 262 fibroids, the median growth rate was about 9% per 6 months (range -89% to +138%), and fibroids in the same woman grew at different rates⁶. In another study of 122 women, median fibroid volume rose 35.2% per year, and smaller fibroids (under 20 mm) grew faster than larger ones⁷. The first study found that size did not predict growth rate⁶, so the two studies disagree. This explains why repeat measurements matter; it is not a way to predict how your own fibroid will grow.

6. Can fibroids shrink on their own, or after menopause?

   Some can. In the growth-rate study above, 7% of fibroids shrank by more than 20%⁶. Fibroids also often shrink after menopause³.

7. How often should imaging be repeated if I'm being monitored?

   No published interval is cited here. Ask your doctor how often you should be checked, and which changes in bleeding, pressure, pain, or growth should bring you back sooner.

8. Does a fast-growing fibroid mean I might have cancer?

   Growth rate and cancer risk are a separate question from this page. Read can a fast-growing fibroid be cancer for what the evidence shows.

9. How do I make sense of size and location on my MRI or ultrasound report?

   Reports often describe both size and location. If the terms are unfamiliar, read how to read your fibroid MRI report and the fibroid location glossary for what the location types mean.

10. If I do decide to treat, how do my options compare?

    Treatment choice depends on your symptoms, goals, and fibroid location, not size alone. Read non-surgical fibroid treatment to compare monitoring, medicines, and procedures that keep the uterus, and does UFE work, and can fibroids grow back for what published studies show about UFE outcomes and regrowth.

Sources

1. Baird et al., high cumulative incidence of uterine leiomyoma, Am J Obstet Gynecol 2003, PMID 12548202 ↩︎
2. ACOG Practice Bulletin 228, symptomatic uterine leiomyomas, 2021, PMID 34011888 ↩︎
3. MedlinePlus, "Uterine Fibroids," reviewed 2026 ↩︎
4. Office on Women's Health, "Uterine Fibroids," updated 2025 ↩︎
5. ASRM Practice Committee guideline, 2017, PMID 28865538 ↩︎
6. Peddada et al., growth of uterine leiomyomata, PNAS 2008, PMID 19047643 ↩︎
7. Mavrelos et al., natural history of fibroids, Ultrasound Obstet Gynecol 2010, PMID 20069541 ↩︎