Is It Normal to Have Blood Clots After IUD Insertion?

Passing small blood clots after an IUD insertion is common and, in most cases, entirely normal. The procedure itself involves instruments touching sensitive cervical tissue, and both copper and hormonal IUDs trigger changes in how the uterine lining behaves, which can produce clotty bleeding for days to weeks afterward. That said, the type of IUD you have, how long the bleeding persists, and whether other symptoms show up alongside the clots all matter when deciding whether what you are experiencing is routine adaptation or something that deserves medical attention.

Why the Insertion Itself Causes Bleeding

Before the IUD even starts doing its job, the placement procedure can cause bleeding on its own. To hold the cervix steady during insertion, providers typically use a grasping instrument called a tenaculum. A randomized trial comparing two types of cervical clamps found that the standard single-tooth tenaculum caused bleeding at the cervix in over half of insertions, while a gentler alternative caused bleeding in only about 6% of cases.¹ That cervical bleeding is superficial and generally resolves quickly, but it can mix with normal uterine discharge and look alarming. If you notice blood or small clots within the first few hours after insertion, much of it may simply be from the procedure rather than from the device itself.

A sound (a thin measuring rod) is also passed through the cervix and into the uterus to measure its depth before the IUD goes in. Between the tenaculum grip and the sounding, the cervical canal and lower uterine lining get mildly irritated. Cramping from the uterus contracting around the new device can then push that blood out, sometimes in clumps that look like small clots. This procedural bleeding is short-lived and distinct from the longer-term bleeding pattern changes that develop over the following weeks.

How Copper IUDs Change Your Bleeding

Copper IUDs work without hormones. Instead, the copper ions create a local inflammatory environment inside the uterus that is toxic to sperm. The trade-off is that this same inflammatory response tends to make periods heavier and sometimes longer. A Cochrane systematic review noted that copper IUD users tend to experience increased menstrual bleeding compared to their pre-insertion baseline.² Heavier flow means more opportunity for blood to pool briefly in the uterus and form clots before being expelled, which is why copper IUD users are more likely to notice clotting during their periods.

In studies tracking copper IUD users over time, roughly 40% reported heavy bleeding, and up to two-thirds of women using the TCu380A (the most widely used copper model) complained about menstrual side effects within the first year.³ These numbers sound dramatic, but they reflect subjective reports across a broad range of severity. For many users, “heavier than before” still falls within a medically normal range, even when it includes occasional clots. The bleeding typically settles down after the first three to six months as the uterus adjusts to the device.

How Hormonal IUDs Change Your Bleeding

Hormonal IUDs release levonorgestrel, a progestin that thins the uterine lining over time. This thinning is actually the intended therapeutic effect for people who use hormonal IUDs specifically to manage heavy periods. A study examining endometrial tissue in hormonal IUD users found that the lining showed significant structural changes, including glandular shrinkage in about 79% of samples and remodeling of blood vessels in 87%.⁴ These changes are why many hormonal IUD users eventually have very light periods or no period at all.

But “eventually” is doing a lot of work in that sentence. In the early months, before the lining has fully thinned, hormonal IUDs commonly cause irregular spotting and breakthrough bleeding. The Cochrane review confirmed that hormonal IUD users tend to experience irregular menstruation, especially in the adjustment period.² Small clots during these irregular episodes are possible, particularly in the first few weeks after insertion. However, because the hormonal IUD is actively working to reduce the amount of tissue that builds up each cycle, clotting tends to be less of an ongoing issue compared to copper IUDs.

The Adjustment Timeline

Most providers describe an adaptation window of three to six months. During this period, your body is adjusting to the presence of the device and, in the case of hormonal IUDs, to the local hormone release. Bleeding irregularities during this window, including clots, are considered expected rather than problematic.

The pattern of adjustment differs between the two types. For hormonal IUDs, studies consistently show that bleeding decreases over time, with most users settling into much lighter periods or amenorrhea. For copper IUDs, a systematic review found that about 40% of users continued to report heavy bleeding, and discontinuation rates due to bleeding were consistently higher for copper IUDs than for hormonal ones.⁵ That difference matters practically: if you have a hormonal IUD and are still passing clots after five or six months, that is more unusual than the same experience with a copper IUD.

Increased bleeding and pain cause up to 15% of copper IUD users to have the device removed within the first year.³ That number represents the fraction who found the side effects intolerable, not the fraction who experienced any change at all. Many people experience heavier-than-usual periods with occasional clots and decide the trade-off is worth it for long-acting, hormone-free contraception.

Managing Heavy Bleeding and Clots

If the bleeding is bothersome but not dangerous, over-the-counter anti-inflammatory medications are the first tool to try. A Cochrane review found that NSAIDs, including ibuprofen, naproxen, and mefenamic acid, were effective at reducing menstrual blood loss in IUD users, regardless of whether they had formally complained of heavy bleeding.⁶ NSAIDs work partly by reducing the prostaglandin-driven inflammation that contributes to heavier flow, especially with copper IUDs. Taking them on a schedule during the heaviest days of your period, rather than waiting until bleeding is severe, tends to be more effective.

When NSAIDs are not enough, a separate systematic review looking specifically at copper IUD users found that antifibrinolytic drugs (medications that help blood clot more effectively) and certain other agents may also reduce blood loss, though the evidence base was relatively limited.⁷ Tranexamic acid, the most commonly studied antifibrinolytic, is available over the counter in some countries and by prescription in others. It specifically targets the clot-dissolving pathway, so it can be particularly relevant when clotting is part of the complaint. Your provider can help decide whether adding it makes sense based on how heavy your bleeding actually is.

When Clots and Bleeding Suggest a Problem

Routine post-insertion bleeding tends to follow a recognizable pattern: it starts right after the procedure, may be heaviest during your first few periods, and gradually improves. Bleeding that gets suddenly worse after an initial improvement, or that is accompanied by specific other symptoms, warrants prompt evaluation. Several uncommon but real complications can present with abnormal bleeding and clots.

Expulsion

An IUD can partially or completely slip out of the uterus, particularly in the first few months. In one study following copper IUD users for 12 weeks, 16 out of 283 patients experienced partial or complete expulsion.⁸ A partially expelled IUD can irritate the cervical canal and cause heavier bleeding or cramping. If you can feel the hard plastic of the device at or near your cervix, or if the strings seem significantly longer than they were at your last check, the IUD may have moved and you should see your provider.

Perforation

Uterine perforation, where the device pokes through the uterine wall, is rare but serious. A study of 75 confirmed perforation cases found that the majority of patients presented with abnormal bleeding, abdominal pain, or both, often alongside missing IUD strings.⁹ The combination of bleeding plus inability to find or feel the strings is a key signal. Perforation risk is higher when IUDs are placed in the early postpartum period. A large study found that placement between four and eight weeks after delivery carried nearly double the odds of perforation compared to placement at nine weeks or later.¹⁰ If you had your IUD placed soon after giving birth and develop worsening pain alongside bleeding, this is worth discussing with your provider quickly.

Ectopic Pregnancy

IUDs are highly effective at preventing pregnancy overall, but they are less effective at preventing ectopic pregnancies specifically (where a fertilized egg implants outside the uterus, usually in a fallopian tube). A case report documented a ruptured ectopic pregnancy in a patient despite a correctly positioned IUD.¹¹ Ectopic pregnancies can cause irregular bleeding, one-sided pelvic pain, and shoulder pain if rupture occurs. If you have an IUD and experience sudden or worsening pelvic pain with unusual bleeding, especially if you have other pregnancy symptoms, emergency evaluation is warranted. This is rare, but it is the scenario where delayed care carries the highest risk.

Your Pre-Insertion Bleeding Pattern Matters

Something that gets surprisingly little attention in patient counseling is how your baseline periods affect what you experience after insertion. If you already had heavy periods before getting a copper IUD, you might expect the added bleeding to be unbearable. But data from a large cohort of over 900 copper IUD users found that women with heavy baseline bleeding continued using their IUD at nearly the same rate as those with lighter periods: 80% versus 85% at 12 months, a difference that was not statistically significant.¹² The researchers concluded that having moderately heavy or heavy periods beforehand did not meaningfully increase the risk of early discontinuation.

This finding cuts against a common assumption: that heavy bleeders should avoid copper IUDs. The reality seems to be that people with already-heavy periods are somewhat accustomed to managing heavier flow and may tolerate the increase better than expected, or at least no worse than people starting from a lighter baseline. If your provider has discouraged a copper IUD solely because your periods are heavy, this data suggests the concern is less supported than it appears.

Genetic Factors in IUD-Related Bleeding

Researchers have started looking at whether some people are genetically predisposed to bleed more with a copper IUD. A whole-exome sequencing study identified two gene variants that were significantly associated with abnormal uterine bleeding in copper IUD users. The variants, in genes called NFASC and PIGR, appear to affect coagulation and inflammatory pathways in the endometrium.¹³ This research is still early-stage, and nobody is getting genetic testing before an IUD insertion. But it hints at why two people can get the same device and have vastly different bleeding experiences. The variation is not just about uterine size or placement technique; it may be partly baked into your biology.

Practical Signs to Watch For

Since some bleeding and clotting is expected, the question is how to tell normal adjustment apart from a complication. A few practical rules help:

Soaking through pads or tampons: If you are going through a pad or tampon every hour for more than two consecutive hours, that level of bleeding is heavier than typical post-insertion adjustment and warrants a call to your provider.
Clot size: Small clots, roughly the size of a coin or smaller, are common during heavier periods and generally not worrisome. Clots that are repeatedly larger than a golf ball suggest heavier-than-normal blood loss.
Fever or foul-smelling discharge: Bleeding accompanied by fever or an unusual odor could indicate infection, which needs treatment.
Pain that worsens over time: Cramping in the first few days is normal. Pain that improves initially and then returns, or pain that keeps getting worse rather than better, can signal expulsion, perforation, or other complications.
Missing strings: If you check for your IUD strings and cannot find them, or they feel much shorter or longer than at your last check, the device may have moved.

None of these signs guarantee a serious problem, but each one is a reason to contact your provider rather than waiting to see if it resolves. Most of the time, the answer will be reassurance, but the rare serious complications are much easier to manage when caught early.

Postpartum Insertion and Bleeding Expectations

If your IUD was placed after a recent pregnancy, you face a slightly different risk profile. As noted earlier, perforation rates are higher when placement happens between four and eight weeks postpartum compared to later placement.¹⁰ The postpartum uterus is still involuting (shrinking back to its pre-pregnancy size) and its walls are softer, which likely explains why the device is more likely to migrate through tissue during this window.

Expulsion rates, interestingly, were similar between the early and later postpartum groups in that same study, so the timing issue is specifically about perforation rather than the device slipping out. If you had your IUD placed in the early postpartum window and are experiencing persistent or worsening bleeding, it is worth mentioning the timing to your provider, since it changes which complications are more likely. Breastfeeding also raises perforation risk somewhat, possibly because lower estrogen levels during lactation keep the uterine walls thinner.

Why Discontinuation Rates Do Not Tell the Whole Story

When you search for information about IUD bleeding, you will inevitably encounter statistics about discontinuation, and they can be misleading. A systematic review found that discontinuation due to bleeding could be as high as 50% in some study populations, but also noted that rates varied enormously between studies and were consistently lower for hormonal IUDs than for copper ones.⁵ Those numbers can make it sound like IUD bleeding is intolerable for a huge share of users, but they include people who removed their IUD for any bleeding-related reason, including mild spotting that was simply annoying rather than medically concerning.

The copper IUD study that tracked side effects over time found that while two-thirds of users reported menstrual complaints in the first year, only 15% actually had the device removed for bleeding or pain.³ That gap between “noticed a change” and “had the device removed” is enormous and important. Most people who experience heavier bleeding or occasional clots adapt to it, manage it with NSAIDs, or simply accept it as the cost of long-acting contraception. Knowing that clots are part of a common and usually temporary adjustment can make that decision easier.

1
PubMed. Cervical bleeding with cervical stabilization during IUD placement: allis clamp versus single-tooth tenaculum, a randomized control trial
2
PubMed Central. Non‐steroidal anti‐inflammatory drugs for heavy bleeding or pain associated with intrauterine‐device use
3
PubMed Central. Side effects from the copper IUD: do they decrease over time?
4
Journal of the Society of Obstetricians and Gynaecologists of Pakistan. Long-Term Effects of Levonorgestrel IUD on Endometrial Pathology in Women with Heavy Menstrual Bleeding
5
BMC Women’s Health. Discontinuation rates of intrauterine contraception due to unfavourable bleeding: a systematic review
6
PubMed Central. Non‐steroidal anti‐inflammatory drugs for heavy bleeding or pain associated with intrauterine‐device use
7
PubMed. Treatment of bleeding irregularities in women with copper-containing IUDs: a systematic review
8
PubMed. Relationship between copper IUD complications and ultrasonographic findings
9
Human Reproduction. Uterine perforation caused by intrauterine devices: clinical course and treatment
10
PubMed Central. Complications after interval postpartum intrauterine device insertion
11
PubMed Central. Ruptured Ectopic Pregnancy in the Presence of an Intrauterine Device
12
American Journal of Obstetrics and Gynecology. Effect of baseline menstrual bleeding pattern on copper intrauterine device continuation
13
Personalized Medicine. Whole-exome sequencing reveals novel variants associated with abnormal uterine bleeding caused by copper intrauterine device