Uterine fibroids: the scan found them, but are they really the source of your pain?

Most fibroids never hurt. Before anyone operates on yours for pain, it is worth asking a harder question.

This page is about understanding the condition and the role the brain and nervous system can play in it. It is not a diagnosis. Your own clinicians know your case.

What uterine fibroids are

Uterine fibroids (leiomyomas) are non-cancerous growths of muscle and fibrous tissue in the wall of the uterus. They range from the size of a pea to larger than a grapefruit, and a woman can have one or many. They are extremely common: imaging studies find them in roughly half of premenopausal women who have never been diagnosed with them.

When fibroids cause symptoms, the typical ones are heavy or prolonged periods, anaemia from blood loss, a feeling of pelvic pressure or fullness, frequent urination from pressure on the bladder, and sometimes fertility problems. Sharp pain can occur if a fibroid outgrows its blood supply (degeneration) or twists on a stalk, but that is the exception. Treatment ranges from watchful waiting and medication to procedures such as embolisation, myomectomy or hysterectomy.

The neuroplastic contribution

The ATNS Index of Neuroplastic Symptoms is specific. Fibroids themselves are not caused by neuroplastic symptoms. But most fibroids do not cause pain, so when pelvic pain is present in someone with fibroids, the index says an assessment for neuroplastic symptoms should be part of the complete evaluation, and any decision about an invasive procedure should be carefully weighed. In short: before attributing pelvic pain to fibroids, check whether the nervous system is the real driver.

Neuroplastic symptoms are real, physical symptoms produced by learned pathways in the brain and nervous system, a sensitized alarm system, rather than by ongoing damage or disease in the body. They are not imaginary and not 'in your head'. Because the brain can change, they are reversible.

The pelvis is especially prone to this. Pelvic nerves, the bladder, bowel, uterus and pelvic floor muscles all share wiring, and the brain readily learns to treat the whole region as a danger zone. A fibroid found on a scan can then become the explanation everyone settles on, even when the pain pattern does not fit it. We cover the broader picture in our chronic pelvic pain page and in central sensitization.

What the research shows

No study has tested central sensitization in fibroid-related pain specifically. What exists is strong evidence that fibroids are usually silent, and strong evidence that chronic pelvic pain in women often involves a sensitized nervous system.

• A review of asymptomatic uterine fibroids reported that at least half of all fibroids cause no symptoms, and that this may be an underestimate because so many are found by chance.
• An international internet survey of about 21,700 women found that fibroids are common and that women with a fibroid diagnosis reported chronic pelvic pain more often than women without one (about 14.5 percent versus 2.9 percent). This shows an association, but most women with fibroids still had no chronic pain, and the survey cannot say which pains the fibroids actually caused.
• A systematic review of 29 studies on urogynaecological chronic pelvic pain found evidence of central nervous system hyperexcitability: altered brain structure and function, generalised hypersensitivity to different kinds of stimuli, and autonomic dysregulation.
• A cross-sectional study of 303 women with chronic pelvic pain found that higher scores for nociplastic (nervous-system-driven) pain were linked to greater pain severity and greater impact on daily life.

The careful conclusion: fibroids explain bleeding and pressure far more reliably than they explain chronic pain, and chronic pelvic pain frequently has a nervous-system component. That is why the ATNS index asks for a neuroplastic assessment before invasive treatment is chosen for pain.

Signs the brain may be part of the picture

• Your pain is constant or widespread across the pelvis, rather than tied to periods, intercourse or a specific fibroid location.
• Your fibroids are small, or have not changed, yet pain has grown.
• Pain persisted or returned after a procedure that removed or shrank the fibroids.
• You also have bladder sensitivity, irritable bowel, painful intercourse, low back pain, migraine or fibromyalgia.
• Pain flares with stress, poor sleep or fear, and eases when you are absorbed or relaxed.
• You have a history of pelvic trauma, difficult births or chronic stress.

A solution that addresses it

For the nervous system's share of pelvic pain, there is an approach called pain and symptom reprocessing. It includes education about neuroplastic symptoms, somatic tracking (attending to pelvic sensations with curiosity instead of fear), reducing threat, a graded return to movement, intimacy and daily activity, emotional awareness and expression, and acceptance and commitment skills. Trained clinicians deliver it, often alongside pelvic floor physiotherapy, and digital programs increasingly do too. Our guide to hurt versus harm is a good starting point.

Cindra is a daily AI companion built around these approaches, with daily check-ins, short practices and plain-language lessons, for people whose symptoms have a neuroplastic component. If pelvic pain has stuck around despite a fibroid diagnosis, join the waitlist.

What to do next

1. Get a full gynaecological assessment. Imaging can size and map the fibroids, and your clinician can check for endometriosis, adenomyosis, infection, ovarian causes and bladder or bowel conditions.
2. Ask your gynaecologist a direct question: does my pain pattern match these fibroids? Heavy bleeding and pressure usually do. Diffuse, constant pain often does not.
3. Before agreeing to surgery for pain alone, ask for a neuroplastic or chronic pelvic pain assessment, ideally with a pelvic pain specialist or pelvic floor physiotherapist.
4. If a neuroplastic pattern fits, start learning and practising, whether or not you also choose treatment for bleeding or pressure.

Seek prompt medical care for very heavy bleeding, sudden severe pelvic pain, fever, fainting, or pain in pregnancy.

This article is for general education and is not medical advice, and it does not diagnose or treat any condition. Persistent symptoms deserve a proper medical assessment to rule out disease or injury before a neuroplastic explanation is considered. If your symptoms are new, changing, or come with red-flag signs such as fever, unexplained weight loss, numbness or weakness, chest pain, or loss of bladder or bowel control, see a clinician promptly.