Somewhere between “it’s impossible” and “it happens all the time,” the real answer sits closer to the first than the second. An IUD can move from its original position, but it is uncommon, it is most closely linked to the insertion procedure itself rather than something that happens spontaneously to a well-placed device, and the exaggerated versions of this fear, an IUD “travelling” to your heart or your brain, are not how it actually works.
This article walks through what movement actually means in clinical terms, how often it happens, what genuinely increases the risk, and what to watch for. The goal is not to dismiss the concern. It’s a real, documented complication. The goal is to replace the vague fear with an accurate picture, so you know what’s actually worth paying attention to and what isn’t.
So, Can an IUD Move? A Straight Answer
Yes, in rare cases. There are four distinct ways an IUD can end up somewhere other than its intended position, and they are not interchangeable terms, even though they often get used that way.
Expulsion. The device comes out of the uterus, partially or completely, through the cervix. This is the most common of the four, and it’s most likely to happen in the first few months after placement.
Displacement. The IUD is still inside the uterus but has shifted from its correct position, lower than it should be, or angled, without having left the uterine cavity or gone through the uterine wall.
Embedment. Part of the device has become embedded into the muscular wall of the uterus (the myometrium) without fully passing through it.
Perforation. The device has gone through the uterine wall and is now outside the uterus, in the pelvic or abdominal cavity. This is the complication people usually mean when they ask if an IUD can “move inside the body,” and it is the rarest of the four.
Clinical guidance from ACOG puts the rate of uterine perforation at approximately 1 in 1,000 insertions, and other published literature reports a range, generally cited between roughly 0.2 and 3.6 per 1,000 insertions, depending on the study population and detection method. Whichever figure you use, this is not a common outcome. It is a recognised, low-frequency complication, not a coin-flip risk.
Myth: An IUD Can Travel Through Your Body to Other Organs
This is the version of the fear that circulates most widely, and it’s the least accurate. An IUD does not detach from a correctly placed position and wander through the body on its own. When perforation and migration do occur, there is a specific mechanical sequence behind it: the device perforates the uterine wall, almost always at or very close to the time of insertion, and from there it can move into the surrounding pelvic or abdominal cavity, most commonly reported locations include the omentum, the bladder, the broad ligament, the peritoneum, or the area near the bowel.
Extremely rare case reports exist describing migration to more distant locations, including the chest cavity. These are documented outliers in the medical literature, not a representative outcome, and at least one such case was linked to a separate, pre-existing anatomical condition (a diaphragmatic defect) rather than the IUD moving through normal body tissue on its own. Case reports like this get attention precisely because they are so unusual. They are not evidence that migration to distant organs is a realistic concern for the overwhelming majority of IUD users.
Myth: If Your IUD Moves, You’ll Definitely Know
This is actually backwards, and it’s one of the more clinically important points to understand. A meaningful proportion of perforations are asymptomatic, meaning the person experiences no pain, no unusual bleeding, and no obvious sign that anything has changed. In some documented cases, perforation is only discovered incidentally, during imaging done for an unrelated reason, or during a routine check of the device’s strings.
This is exactly why the standard follow-up visit after IUD placement, and periodic string checks in between visits, exist. They are not a formality. They are the mechanism that catches displacement or perforation in cases where there are no symptoms to prompt you to seek care on your own.
What Actually Increases the Risk
Risk is not random or unavoidable. The clinical literature points to a few specific factors worth knowing:
Timing of insertion. Perforation risk is more closely tied to the insertion procedure itself than to anything that happens weeks or months later to a correctly placed device. Insertion during the postpartum period, particularly in the weeks immediately following delivery, is specifically identified as a higher-risk window, related to the uterus’s altered size, tone, and healing state during that period.
Insertion technique and clinician experience. Because IUD insertion is performed without direct visualisation of the uterine cavity, technique and experience matter. This is part of why choosing a qualified provider, and following up as recommended, is directly relevant to reducing risk, not just a general good idea.
Uterine anatomy and prior uterine surgery. Structural factors, including scar tissue from prior procedures, uterine shape, and softened or thinned uterine walls, can all influence the ease and safety of correct placement.
None of this means placement is unsafe. It means the risk is concentrated around specific, identifiable factors, insertion timing and technique chief among them, rather than being an unpredictable event that can happen to any correctly placed device at any time.
Warning Signs Worth Contacting Your Gynaecologist About
Because a meaningful share of complications don’t present with obvious symptoms, routine follow-up matters more than symptom-watching alone. That said, these are the signs that warrant a call rather than a wait-and-see approach:
- You can’t feel the IUD strings where you previously could, or the strings feel noticeably longer or shorter than before
- Persistent or worsening lower abdominal or pelvic pain, particularly if it’s new or different from typical cramping
- Unusually heavy bleeding, or bleeding that doesn’t fit the pattern your gynaecologist described as expected for your device
- You can feel the hard plastic of the device itself, rather than just the soft strings, at the cervix or lower in the vagina
- Any signs of infection, fever, unusual discharge, or pelvic pain accompanied by feeling generally unwell
- A positive pregnancy test while the IUD is in place, since this can be associated with displacement or expulsion and needs prompt evaluation
None of these symptoms confirm that something has gone wrong on their own. They’re the signal to get checked, not a diagnosis.
Postpartum Placement: Why It’s a Separate Conversation
Because the postpartum period carries a distinct risk profile, IUDs intended for placement shortly after delivery are typically designed and evaluated specifically for that context, rather than treated as identical to interval placement (insertion unrelated to a recent pregnancy). If you’re considering placement in the postpartum period, it’s worth asking your gynaecologist directly about the specific device being used, the timing being recommended, and what follow-up schedule they suggest given that context.
Frequently Asked Questions
How common is it for an IUD to move after it’s been placed correctly? Uncommon. Uterine perforation is estimated at approximately 1 in 1,000 insertions by ACOG, with other published estimates ranging roughly between 0.2 and 3.6 per 1,000. Movement is also more strongly associated with the insertion procedure itself than with something happening later to a correctly placed device.
Can an IUD travel to my heart, lungs, or brain?
This is one of the more exaggerated versions of the concern. When migration occurs, it follows a specific path: perforation through the uterine wall, followed by movement into the surrounding pelvic or abdominal cavity. Extremely rare case reports of migration to more distant sites exist in medical literature, but they are documented outliers, not a realistic expectation for the vast majority of IUD users.
Will I definitely feel it if my IUD has moved?
Not necessarily. A meaningful share of displacement and perforation cases are asymptomatic and are only discovered during a routine follow-up visit, a string check, or imaging done for another reason. This is exactly why the standard follow-up appointment after placement matters, regardless of whether you feel anything unusual.
What’s the difference between expulsion and perforation?
Expulsion means the device has come out of the uterus through the cervix, partially or fully. Perforation means the device has gone through the uterine wall and is now outside the uterus entirely, in the pelvic or abdominal cavity. Perforation is rarer and more serious than expulsion.
Is the risk higher if my IUD was placed after childbirth?
Postpartum placement is identified in clinical literature as a higher-risk window for perforation, related to the uterus’s altered size and healing state during that period. This is one reason postpartum-specific devices and placement timing are typically evaluated and recommended separately from placement unrelated to a recent pregnancy.
What should I do if I can’t feel my IUD strings?
Contact your gynaecologist rather than trying to check further yourself. Not being able to feel the strings can have several explanations, including the strings curling up higher in the cervix, and doesn’t automatically mean the device has moved, but it does warrant a proper check.