An IUD can cause back pain, and it is one of the more frequently reported side effects. Research using ultrasound-guided assessment found that low back pain rates ranged from roughly 14% to 23% depending on the type of device, making it far from rare. The pain usually stems from the uterus reacting to the device rather than from anything wrong with the spine itself, but in uncommon situations, back pain after IUD placement can signal a complication that deserves medical attention.
How Common Is IUD-Related Back Pain
Most discussions about IUD side effects focus on cramping and changes to menstrual bleeding, but back pain shows up consistently in studies that actually ask about it. A study using three-dimensional transvaginal ultrasound to evaluate IUD positioning and side effects found that overall adverse reaction rates after placement were about 34%, and low back pain was a significant component. The rate of low back pain varied by device type: copper-T designs had the highest rate at roughly 23%, while ring-shaped and other configurations came in between about 14% and 16%.1Virtual Health Library. Clinical study of three‐dimensional transvaginal ultrasound in assessing abnormal position and adverse reactions of intrauterine device Those numbers mean that if you have a copper IUD and you are experiencing low back pain, you are not imagining it and you are not alone. It is a real, documented pattern.
Why an IUD Can Trigger Back Pain
Your uterus is a muscular organ, and placing a foreign object inside it provokes a reaction. The uterus contracts around the device, essentially trying to adjust to or expel something that was not there before. These contractions are similar to menstrual cramps, and they follow the same nerve pathways. The nerves that serve the uterus and cervix share connections with those running through the lower back and pelvis. When the uterus cramps, pain signals can radiate into the lumbar spine, the sacrum, and even the upper thighs. Doctors call this referred pain: you feel the discomfort in one place, but the source is somewhere else entirely.
This is the same mechanism behind the low back ache that many people experience during their period. An IUD, particularly a copper one, can amplify that process because the device itself causes the uterine lining to produce more prostaglandins, the chemical messengers that drive cramping. More prostaglandins mean stronger contractions, and stronger contractions mean more referred pain in the back.
The Insertion Period and Acute Pain
For most people, the worst pain happens during and immediately after the IUD is placed. The procedure involves passing a thin insertion tube through the cervix, which can trigger a sharp cramping sensation. A review of the research on insertion pain noted that about 17% of people who have never given birth experience severe pain during the procedure, while roughly 11% of those who have previously delivered also report severe pain.2Human Reproduction Update. Management of pain associated with the insertion of intrauterine contraceptives That acute pain can absolutely include the lower back. In the first hours and days after insertion, cramping and back pain are considered normal parts of the body’s adjustment.
A large study tracking copper IUD users found that in the first nine weeks after placement, about 9% of participants reported serious pain.3PubMed Central. Side effects from the copper IUD: do they decrease over time? That percentage is significant enough to be worth preparing for, but it also means the vast majority settle in without extreme discomfort. Still, mild-to-moderate cramping and back aching during the first few weeks is very common and does not necessarily indicate a problem.
Does the Pain Get Better Over Time
This is usually the most pressing question after “why does this hurt?” and the answer, for most people, is yes. The same study that tracked copper IUD users over multiple nine-week intervals found that during menstrual periods, most bleeding and pain side effects decreased over time. In the first nine-week window, about 38% of participants reported more menstrual pain with the IUD compared to before using it. In subsequent time periods, that proportion dropped to roughly a third.3PubMed Central. Side effects from the copper IUD: do they decrease over time?
The rate of severe pain also fell: fewer people reported it in the second, third, and fourth nine-week periods compared to the first, even after accounting for people who had their IUD removed early. That is encouraging, because it suggests genuine improvement rather than just the most-affected people dropping out of the picture. However, the same study found a nuance worth knowing: while menstrual pain and bleeding tended to ease, intermenstrual spotting and pain between periods did not follow the same downward trend. For some people, the number of days with those between-period symptoms actually increased. So the pattern is not a simple straight line to feeling better. Menstrual-related back pain is likely to improve; random mid-cycle aching may be more stubborn.
Copper IUDs Versus Hormonal IUDs
The two main categories of IUD work in fundamentally different ways, and that affects the pain profile. Copper IUDs create a local inflammatory response in the uterine lining, which is what makes them hostile to sperm. That inflammation also means more prostaglandins, heavier periods, and stronger cramps, particularly in the first several months. This is why copper devices consistently show up with higher back pain rates in studies comparing device types.1Virtual Health Library. Clinical study of three‐dimensional transvaginal ultrasound in assessing abnormal position and adverse reactions of intrauterine device
Hormonal IUDs release a small amount of progestin directly into the uterus. Progestin thins the uterine lining over time, which usually leads to lighter periods and less cramping. Many people who switch from a copper device to a hormonal one report that their cramping and back pain improved. That said, hormonal IUDs are not pain-free either, especially in the first weeks after insertion when the body is still adjusting to the device itself, regardless of what it releases. A study comparing the two types found that the profile of side effects was not dramatically different from what is seen with routine, non-emergency insertions.4PubMed. Comparison of copper intrauterine device with levonorgestrel-bearing intrauterine system for post-abortion contraception
If back pain was your primary reason for considering a switch, the hormonal IUD is the more likely candidate to bring relief, but it is not a guarantee. Some people experience back pain with any device. The shape and fit of the IUD within your particular uterus plays a role that no head-to-head trial can fully predict for an individual.
When Back Pain Could Signal a Complication
Most IUD-related back pain is benign, but there are uncommon situations where it points to something that needs urgent attention. Two worth knowing about are perforation and pelvic infection.
Uterine Perforation
Perforation means the device has partially or fully moved through the wall of the uterus. This is rare, occurring in roughly 1 to 2 out of every 1,000 insertions depending on the study, but it can cause persistent lower abdominal and back pain. In one documented case, a patient developed lower abdominal and back pain about four years after IUD placement. The symptoms lasted only a day and resolved on their own, but imaging eventually revealed that the device had perforated the uterus and migrated into the sigmoid colon, causing chronic tissue damage.5PubMed Central. Chronic nodules of sigmoid perforation caused by incarcerated intrauterine contraception device The takeaway is that perforation does not always announce itself with dramatic, ongoing pain. Sometimes the initial symptoms are mild or brief, and the real damage accumulates silently. If you cannot feel your IUD strings and you are having unexplained back or pelvic pain, an ultrasound to confirm the device’s position is a straightforward next step.
Pelvic Inflammatory Disease
Pelvic inflammatory disease (PID) is an infection of the reproductive organs that can cause back pain along with fever, unusual discharge, and pelvic tenderness. The risk of PID is modestly elevated in the first few weeks after IUD insertion, when bacteria from the cervix or vagina can be introduced into the uterus during the procedure. After that initial window, the risk drops back to baseline for most people. In rare cases, however, an IUD can be associated with a more chronic infection. One reported case involved a patient with an IUD who developed a large abscess in the pelvis caused by a specific type of bacteria called Actinomyces. Her symptoms included prolonged fatigue, back pain, fever, and anemia before the abscess was identified and surgically treated.6PubMed Central. Pelvic actinomycosis and usage of intrauterine contraceptive devices
PID and actinomycosis are uncommon, and they are treatable. The point is not to be alarmed by every twinge of back pain but to recognize the combination of symptoms that warrants a call to your provider: persistent or worsening pain, fever, abnormal discharge, or pain during intercourse.
What You Can Do About IUD-Related Back Pain
If your back pain is in the “annoying but manageable” category and your provider has confirmed the IUD is properly positioned, over-the-counter anti-inflammatory medications are the first line of defense. A Cochrane review examining the evidence on nonsteroidal anti-inflammatory drugs for IUD-related pain found that most trials showed these medications to be effective. Naproxen sodium, in particular, stood out: of 17 people who took it during one or more menstrual cycles, 14 reported good or excellent pain relief in at least one cycle. By comparison, only 4 out of 16 people taking a placebo reported the same level of relief.7Cochrane Library. Non‐steroidal anti‐inflammatory drugs for pain and bleeding associated with intrauterine device use
Timing matters with these medications. Taking an anti-inflammatory before the pain peaks, ideally at the first sign of cramping or even the day before you expect your period, can blunt the prostaglandin surge before it fully kicks in. Waiting until you are already in significant pain means the inflammatory cascade has a head start. A heating pad on the lower back can help too, and combining it with an anti-inflammatory is a reasonable strategy for the worst days.
If OTC medications and a heating pad are not cutting it, or if your back pain is constant rather than tied to your cycle, it is worth going back to your provider. Persistent pain that does not follow a menstrual pattern could indicate the IUD has shifted, that the device is not the right fit for your uterine anatomy, or that something else is contributing.
When an Underlying Condition Makes Things Worse
Sometimes an IUD gets blamed for back pain that was already being caused or amplified by a pre-existing condition. Adenomyosis, where tissue that normally lines the uterus grows into the muscular wall, is a common culprit. It causes heavy periods, severe cramping, and chronic pelvic and back pain on its own. Placing an IUD into a uterus affected by adenomyosis can stir up symptoms, although the hormonal IUD is actually used as a treatment for adenomyosis in some cases. A study tracking hormonal IUD use in patients with adenomyosis found that many of them also had concurrent fibroids or endometriosis, both of which independently contribute to pain.8PubMed Central. Long-term efficacy and feasibility of levonorgestrel-releasing intrauterine device use in patients with adenomyosis
Endometriosis, where tissue similar to the uterine lining grows outside the uterus, is another condition that can cause or worsen back pain. Lesions on the ligaments that support the uterus or near the nerves of the pelvis can produce deep, aching back pain that worsens around menstruation. If you had significant back pain before getting your IUD and it has persisted or intensified, consider whether the device is the cause or whether it has drawn your attention to a condition that was already there. This is especially relevant if your pain is accompanied by very heavy periods, pain during bowel movements, or pain during sex, all of which point toward adenomyosis or endometriosis rather than the IUD alone.
IUD Shape and Fit
Not all IUDs are the same shape, and the shape of the device relative to the shape and size of your uterus can influence how much discomfort you experience. The study that measured back pain rates across different device types found meaningful variation. Copper-T devices had the highest low back pain rate at about 23%, while ring-shaped and other configurations ranged from about 14% to 17%.1Virtual Health Library. Clinical study of three‐dimensional transvaginal ultrasound in assessing abnormal position and adverse reactions of intrauterine device The differences were statistically significant, suggesting that how a device sits inside the uterine cavity affects back pain risk in a way that goes beyond just whether it contains copper or hormones.
Uterine size and tilt matter too. A uterus that is retroverted (tilted backward toward the spine) may produce more back-focused pain because the organ is already oriented closer to the lower spine and sacral nerves. If your IUD was placed without accounting for a significant retroversion, the device may press against the uterine wall in a way that concentrates irritation toward the back. A provider who measures the uterine cavity before insertion and chooses a device size appropriate for the anatomy can reduce this mismatch, though it does not eliminate it entirely.
When to Consider Removal
Most people who experience back pain after IUD placement find it manageable with anti-inflammatories and time, especially once the first few months pass. But if your back pain is severe enough to interfere with daily life, has not improved after three to six months, or is getting worse rather than better, removal is a reasonable option. The IUD is supposed to make your life easier by providing reliable contraception, and if the trade-off is chronic pain, the math may no longer work.
Before removal, your provider will typically check the device’s position with an ultrasound, review your symptoms, and consider whether something besides the IUD is contributing. If imaging shows the device is well-positioned and your pain is purely from the uterus reacting to it, switching to a smaller or differently shaped device, or moving from copper to hormonal, may resolve the issue without giving up intrauterine contraception altogether. For some people, the answer is a different contraceptive method entirely, and that is a perfectly valid outcome.
One thing worth keeping in mind: after removal, IUD-related back pain typically resolves within a cycle or two. If it does not, the IUD was probably not the cause, and further investigation into conditions like adenomyosis, endometriosis, or musculoskeletal issues is warranted. The IUD is a convenient scapegoat for lower back pain, which is extremely common in the general population for reasons that have nothing to do with contraception. Sorting out which part of the pain belongs to the device and which part belongs to everyday life is not always straightforward, but a methodical approach with your provider usually gets to the answer.