Yes, uterine fibroids can cause lower back pain, and it’s one of the most commonly reported symptoms. In a large cross-sectional survey of women with fibroids in the United States, more than 60% reported experiencing lower back pain at some point, and about 58% had it within the previous four weeks. Roughly 28% rated the pain as extremely bothersome.
How Fibroids Cause Back Pain
Fibroids cause back pain through two main mechanisms: direct pressure on nerves and secondary muscle tension in the pelvic floor.
The uterus sits in front of the lower spine, surrounded by a network of nerves that run through the pelvis and into the legs. When a fibroid grows on the back wall of the uterus (called a subserosal fibroid), it can press against these nerves or push into the space near the base of the spine. In one documented case, a fibroid measuring roughly 12.5 centimeters across compressed multiple branches of the nerve network that serves the lower back, hips, and legs, causing pain that had been mistakenly attributed to spinal problems. The fibroid had grown so large it filled the space behind the uterus all the way up to the bony ridge at the base of the spine.
When nerve compression is intermittent, it causes temporary pain that comes and goes. But prolonged compression can damage the nerve’s protective coating, leading to persistent pain, numbness, or weakness. This is the same basic process that happens with a herniated disc pressing on a nerve, just from a different direction.
The second pathway is more indirect. Fibroids create pressure on surrounding structures like the bladder and bowel, and the pelvic floor muscles respond by tightening and guarding. That chronic muscle tension radiates into the lower back, sometimes becoming the primary source of pain even when the fibroid itself isn’t directly touching a nerve.
Which Fibroids Are Most Likely to Cause It
Not all fibroids cause back pain. Location and size are the two biggest factors. A large fibroid growing on the outer back surface of the uterus is far more likely to cause back pain than a small one embedded within the uterine wall. Fibroids range from the size of a pea to the size of a melon, and the ones that press against the spine or pelvic nerves tend to be on the larger end of that spectrum.
Fibroids that grow on a stalk (pedunculated fibroids) can also cause problems if they extend toward the back of the pelvis. In one case, a pedunculated fibroid impinged on the opening where the sciatic nerve exits the pelvis, mimicking classic sciatica with pain running down the leg.
How It Differs From Other Back Pain
Fibroid-related back pain can be tricky to identify because it often looks like an orthopedic problem. Several documented cases describe women who were initially treated for disc problems or spinal nerve compression, only to find that imaging of the pelvis revealed a large fibroid as the true cause. In one case, a woman was treated for a suspected lower spine nerve issue without improvement. Spinal imaging showed some disc wear but nothing severe enough to explain her symptoms. It wasn’t until a pelvic MRI revealed a large fibroid pressing on her sciatic nerve that the real cause was identified.
A few patterns can help distinguish fibroid-related back pain from spinal issues. Fibroid back pain often comes with other pelvic symptoms: heavy or prolonged periods, frequent urination, difficulty emptying the bladder, constipation, or a feeling of pressure low in the abdomen. If your back pain coincides with these symptoms, fibroids are worth investigating. Pain that worsens around your period is another clue, since the hormones estrogen and progesterone that drive each menstrual cycle also promote fibroid growth, potentially increasing pressure on nearby structures at certain times of the month.
Back pain that doesn’t respond to standard orthopedic treatment, like physical therapy for a suspected disc problem, is also a red flag for a pelvic cause.
Getting an Accurate Diagnosis
A standard pelvic ultrasound can detect fibroids, but it doesn’t always show their relationship to nearby nerves. Pelvic MRI provides the detailed view needed to see whether a fibroid is physically pressing on nerve pathways in the pelvis. This is especially important when back pain is the primary complaint and spinal imaging hasn’t revealed a clear cause.
If you’re being evaluated for persistent lower back pain and have known fibroids, or if you have unexplained back pain along with heavy periods or urinary symptoms, asking about pelvic imaging is reasonable. The connection between fibroids and back pain is well established, but it’s still frequently overlooked in initial evaluations.
Treatment Options and Pain Relief
Treating fibroid-related back pain means either shrinking or removing the fibroid, or managing the secondary muscle tension it creates.
Surgical removal of the fibroid (myomectomy) can produce dramatic results when the fibroid is directly compressing nerves. In one reported case, a 39-year-old woman with three months of lower back pain that hadn’t responded to other treatments experienced complete resolution after a fibroid less than 4 centimeters was removed. The pain went away entirely once the source of pressure was gone.
A less invasive option is uterine artery embolization, a procedure that cuts off blood flow to the fibroid, causing it to shrink over time. The procedure itself causes temporary pelvic and abdominal pain that peaks in the first 6 to 8 hours, decreases significantly within 24 hours, and typically subsides within 7 to 10 days. As the fibroid shrinks in the weeks and months following the procedure, pressure symptoms including back pain gradually improve.
For women with smaller fibroids where the back pain is driven more by pelvic floor tension than by direct nerve compression, targeted pelvic floor therapy can help. This approach focuses on releasing the tight, guarded muscles that develop in response to the fibroid’s presence. Treating the muscle spasm and nerve irritation in the pelvic floor often reduces back pain even without removing the fibroid itself.
Symptoms That Need Urgent Attention
Most fibroid-related back pain is a quality-of-life issue, not a medical emergency. But fibroids can occasionally cause symptoms that require immediate care. Sharp, sudden abdominal pain that doesn’t respond to pain medication, or severe vaginal bleeding accompanied by lightheadedness, extreme fatigue, or weakness (signs of significant blood loss) warrant emergency evaluation. These rare situations can occur when a fibroid outgrows its blood supply or when heavy bleeding leads to dangerous levels of anemia.
Progressive leg weakness, numbness, or loss of bladder control alongside back pain also signals that nerve compression may be worsening and needs prompt assessment. Prolonged compression carries an increasing risk of lasting nerve damage, so earlier intervention leads to better outcomes.