Who Is a Candidate for an IUD? Heavy Bleeding, Pelvic Infection History and What Doctors Check

She has the appointment booked and a note on her phone titled ‘coil questions.’ Near the top: her periods are heavy enough to plan travel around them. Further down, in smaller words she almost deleted: a chlamydia infection in her early twenties that she has never mentioned to a doctor since. She is not sure whether either fact opens the door to an IUD or closes it.

That mix of hope and hesitation is common. People arrive asking who can get an IUD and half-expecting to be told they cannot. The honest answer is more generous than most of them fear, and more specific than the internet usually admits.

Eligibility is not a mood or a hunch. Clinicians work from published medical eligibility criteria that sort health conditions into categories, and most of the conditions people worry about sit in the ‘fine to use’ columns. This article walks through what those criteria say, what actually happens at the fitting, and which situations genuinely call for a pause.

Who can get an IUD? The short version, and why the list is longer than people think

An IUD, or intrauterine device, is a small T-shaped piece of plastic placed inside the uterus to prevent pregnancy for several years. Two families exist: copper devices, which contain no hormones, and hormonal devices, which slowly release a progestogen called levonorgestrel. In the UK the hormonal version is often called an IUS, or intrauterine system, but the fitting, the checks and most of the eligibility rules overlap.

Who can get an IUD? Almost anyone with a uterus who wants reliable, reversible contraception and does not have one of a short list of current conditions. That includes people who have never been pregnant, adolescents, people over 40, those who smoke, people with high blood pressure or migraine with aura, and people living with HIV. Each of those sits in the acceptable categories of the CDC’s US Medical Eligibility Criteria for Contraceptive Use, the reference most US clinicians use when deciding whether a method is safe for a particular person.

The list of who cannot is genuinely short. It centers on pregnancy, an active infection inside the pelvis, bleeding that has not yet been explained, a few cancers and a uterus whose shape would not hold the device. Even then, several of these are temporary. Treat the infection, finish the investigation of the bleeding, and the person often becomes a candidate again.

Why does the myth of strict eligibility persist? Partly history. For decades in the US, IUDs were quietly reserved for people who had already had children, based on outdated fears about infection and infertility. Guidelines have moved on. The evidence has too. What follows is the current picture, condition by condition.

How an IUD actually works inside the uterus

The two device types prevent pregnancy by different routes, and understanding the difference explains a lot about who is offered which.

A copper IUD releases tiny amounts of copper ions into the uterus. Copper is toxic to sperm and eggs, so fertilization is far less likely, and the local inflammatory response in the uterine lining makes implantation unlikely if an egg is fertilized anyway. No hormones enter the bloodstream, so ovulation carries on as normal and periods keep their usual pattern, although they often become heavier or longer for the first months. According to the NHS, a copper IUD can stay in place for 5 to 10 years depending on the model, and it starts working as soon as it is fitted.

A hormonal IUD releases levonorgestrel directly into the uterus. The progestogen thickens cervical mucus so sperm struggle to pass, thins the uterine lining so it is less receptive, and in some people also suppresses ovulation, particularly early on. Because the hormone acts locally, blood levels are much lower than with pills or injections. The NHS notes hormonal devices last 3 to 8 years depending on type, and that if fitted in the first seven days of a cycle they work straight away; otherwise extra contraception is usually advised for seven days.

Both types are more than 99 percent effective in typical use, the NHS states, largely because there is nothing to remember day to day. A thin thread hangs through the cervix into the top of the vagina so a clinician can check position and remove the device when the person chooses. Fertility returns quickly after removal for both types.

That thinner lining from the hormonal device is the reason it doubles as a treatment for heavy bleeding, a point that shapes candidacy more than almost anything else.

Who is usually a good candidate, and who is usually asked to wait

Medical eligibility criteria, published by the WHO and adapted by the CDC, grade each health condition from 1 to 4 for each method. Category 1 means no restriction. Category 2 means the benefits generally outweigh the risks. Category 3 means risks usually outweigh benefits and the method is not normally recommended. Category 4 means the method should not be used. Clinicians reach for this framework, not intuition.

Most everyday situations land in categories 1 and 2 for both IUD types: age under 20 or over 40, never having given birth, obesity, smoking, hypertension, diabetes, most migraine patterns, a history of blood clots, depression, epilepsy, endometriosis, uncomplicated fibroids and past pelvic inflammatory disease. That breadth is why IUDs are frequently suitable for people who have been told they cannot use estrogen-containing pills.

People usually asked to wait, rather than refused outright, include those with:

• A possible current pregnancy, until it has been excluded.
• Current pelvic inflammatory disease, purulent cervicitis, chlamydia or gonorrhea, until treated.
• Unexplained vaginal bleeding, until the cause has been evaluated.
• Recent childbirth complicated by infection of the uterus, or infection after abortion.

A smaller group is generally not offered an IUD at all, or not a particular type: people with a uterine cavity distorted by fibroids or a congenital anomaly, cervical cancer awaiting treatment, endometrial cancer, gestational trophoblastic disease with persistently raised pregnancy hormone levels, pelvic tuberculosis, and, for the hormonal device specifically, current breast cancer. A known copper allergy steers people away from the copper device.

The pattern is worth noticing. Almost every barrier is either temporary or specific to one device. Very few people are permanently ruled out of both.

What disqualifies you from getting an IUD? The category 4 list explained

Search engines fill with the question ‘what disqualifies you from getting an IUD,’ and the answer deserves to be concrete rather than vague. Below is the reasoning behind each of the main exclusions in the CDC’s eligibility criteria.

Pregnancy. Inserting a device into a pregnant uterus risks miscarriage, infection and injury. Every fitting begins with excluding pregnancy, by history, a test, or both.

Active pelvic infection. Pushing a device through an infected cervix can carry organisms upward into the uterus and tubes. Current PID, purulent cervicitis, or untreated chlamydia or gonorrhea are category 4 for starting an IUD. Once treated, the category drops and fitting can be reconsidered.

Unexplained bleeding. Bleeding that might signal a serious condition needs a diagnosis first, because an IUD would muddy the picture and delay treatment. This is a pause, not a rejection.

Cancers of the cervix or uterine lining, and gestational trophoblastic disease with raised hormone levels. Here the priority is cancer care, and the device could interfere with staging or treatment.

A distorted uterine cavity. Large fibroids inside the cavity or a septate or bicornuate uterus can prevent the device from sitting correctly, raising the chance of expulsion or failure. A scan settles this.

Current breast cancer is a category 4 for the hormonal device only, because of theoretical hormone sensitivity. The copper device remains an option.

Pelvic tuberculosis is rare in most settings but is listed for both devices.

Notice what is not on the list: age, weight, never having had a baby, blood pressure, migraine, clotting history, smoking. Those are the things people most often assume will disqualify them, and none of them do.

Heavy bleeding: when an IUD is the treatment, not the problem

Heavy menstrual bleeding, medically called menorrhagia, means periods heavy enough to interfere with daily life, often with clots, flooding, or bleeding for more than seven days. It is one of the commonest reasons people ask about IUDs, and it splits the two device types sharply.

For the hormonal IUD, heavy bleeding is not a barrier. It is frequently the reason for fitting one. By thinning the lining of the uterus, the device typically makes periods lighter and shorter over time, and for some people bleeding stops altogether. The NHS lists the levonorgestrel intrauterine system among first-line options for treating heavy periods, and its heavy periods guidance describes it as a treatment that can be offered even when contraception is not needed. Many gynecology teams will discuss it before considering surgery for bleeding without an identified structural cause.

The copper IUD is the mirror image. Because it contains no hormone and can increase menstrual blood loss, the NHS advises that it may not be suitable for people who already have heavy or painful periods. Someone with troublesome bleeding who wants a hormone-free method deserves a frank conversation about that trade-off rather than a flat refusal, but the clinical steer is clear.

Two caveats matter. First, heavy bleeding is a symptom, and clinicians will want to know why it is happening before choosing any treatment. Fibroids, polyps, thyroid problems, bleeding disorders and, less often, precancerous change in the lining can all cause it. Depending on age and history, that may mean a blood count, a pelvic ultrasound, or a biopsy of the lining. Second, if fibroids are distorting the cavity, the hormonal device may not sit well, so the same scan that explains the bleeding also confirms whether the uterus can hold the device.

So heavy bleeding usually moves a person toward a hormonal IUD rather than away from IUDs entirely. The infection question is where more people wrongly count themselves out.

Who can get an IUD after a pelvic infection or STI?

Pelvic inflammatory disease, or PID, is an infection of the uterus, fallopian tubes or ovaries, most often following untreated chlamydia or gonorrhea. Decades ago a history of PID was treated as a near-permanent reason to refuse an IUD. Current guidance does not support that.

The distinction that matters is current versus past. A current infection is category 4 for starting an IUD in the CDC criteria, for the mechanical reason described earlier: instrumenting an infected cervix can spread the infection upward. A past infection that has been treated and resolved is different. The CDC grades a history of PID as category 1 if the person has since had a pregnancy and category 2 if they have not, meaning the device is acceptable in either case. The subsequent-pregnancy detail is simply a marker that the tubes are likely functioning.

Where does the infection risk actually sit? Studies summarized in the WHO and CDC criteria show the small excess risk of PID after insertion is concentrated in the first three weeks, and it relates mainly to whether an infection was present at the time of fitting, not to the device itself over the years that follow. This is why testing for chlamydia and gonorrhea before or at insertion is standard for people at higher risk, and why a positive result leads to treatment first and fitting afterward.

A few points people find reassuring:

• Having had an STI in the past does not lower eligibility once it has been treated.
• Being at ongoing risk of STIs is category 2, not a bar, but condoms are still advised because no IUD protects against infection.
• If an infection is diagnosed after the device is in place, guidelines generally allow treatment with the device left in, unless symptoms fail to improve.

The woman from the opening scene, then, has nothing to hide. Her decade-old, treated infection is a footnote, not a verdict.

Hormonal IUD vs copper IUD: a candidacy comparison at a glance

The two device types share a fitting procedure and most eligibility rules but diverge on bleeding, hormones and duration. The table below summarizes how the commonest candidate questions differ, drawing on NHS and CDC guidance.

Question	Hormonal IUD	Copper IUD
Contains hormones?	Yes, levonorgestrel released locally	No
Effect on periods	Usually lighter, shorter; may stop	Often heavier and longer, especially in first months
Heavy periods already	Often a reason to choose it	Often a reason to reconsider
Typical duration (NHS)	3 to 8 years, model-dependent	5 to 10 years, model-dependent
Starts working	Immediately if fitted in first 7 days of cycle; otherwise after 7 days	Immediately
Emergency contraception	Not used for this	Yes, within 5 days of unprotected sex (NHS)
Current breast cancer	Not recommended (CDC category 4)	Acceptable
Copper allergy	Acceptable	Not suitable
Never given birth / teens	Acceptable (CDC category 2)	Acceptable (CDC category 2)
Past PID, now resolved	Acceptable (category 1 or 2)	Acceptable (category 1 or 2)
Breastfeeding	Acceptable	Acceptable

A note on reading this honestly: ‘acceptable’ does not mean ‘ideal for you.’ Someone with painful periods and a dislike of hormones faces a real dilemma that a table cannot resolve. Someone with irregular bleeding they would find distressing needs to know that hormonal devices commonly cause spotting for months before things settle. The clinician’s job is to lay both columns beside a person’s history and priorities, and the person’s job is to say which side effects they could live with.

Where the columns do not differ, as with teens and past infection, the answer is the same for both: eligibility is rarely the obstacle.

Teens, people who have never given birth, and life after pregnancy

Two groups still hear ‘you’re too young’ or ‘you haven’t had children’ from friends, relatives and occasionally from outdated advice. Neither is a medical barrier.

For adolescents, the CDC criteria grade both IUD types as category 2 under age 20, acceptable with the benefits generally outweighing the risks. The category 2 rather than 1 reflects a slightly higher expulsion rate in younger people and a higher background risk of STIs, not any danger unique to the device. The NHS is direct: there is no lower age limit as long as the person is sexually active, and the coil can be used whether or not they have had a baby. Consent and confidentiality follow the same rules as any other contraception.

People who have never been pregnant, described medically as nulliparous, also sit in category 2. The uterus may be slightly smaller and the cervix tighter, which can make insertion more uncomfortable, and clinicians may offer local anesthetic or other comfort measures. Fertility is not affected; the old fear that IUDs cause infertility came from infection-related problems in devices that are no longer used, and current evidence in the WHO and CDC reviews does not support it.

After pregnancy, the timing options are broader than many expect:

• An IUD can be placed within the first two days after a vaginal or cesarean birth, or from about four weeks onward, according to NHS guidance. Expulsion is somewhat more likely with immediate placement, which the team will discuss.
• Breastfeeding is compatible with both devices; the hormonal type releases very little hormone into milk.
• Fitting immediately after a miscarriage or abortion is acceptable unless infection is present.

The one postpartum exclusion is infection of the uterus after delivery or abortion, which is category 4 until treated. Otherwise, the weeks after a pregnancy are one of the commonest and best-supported windows for fitting an IUD.

What are the requirements to get an IUD? What doctors actually check

People searching for the requirements to get an IUD often imagine a long list of tests. In practice the pre-fitting assessment is brief and focused, because the eligibility criteria do the heavy lifting.

History. The clinician asks about periods, pregnancies, past pelvic infections and STIs, current symptoms, other health conditions, medications, allergies and what the person wants from contraception. Heavy or painful periods steer the conversation toward the hormonal device. A copper allergy rules out the copper device. Migraine, clotting history and blood pressure are noted mainly to reassure, since they do not restrict IUDs.

Excluding pregnancy. This is the one non-negotiable. It may be by a clear history of no risk since the last period, a urine test, or both. The NHS notes a coil can be fitted at any point in the cycle as long as pregnancy is excluded.

STI screening. Testing for chlamydia and gonorrhea is offered to people at higher risk, including anyone under 25 or with a new partner, and can be done on the same day as fitting rather than as a gate that delays it. A positive result means treatment first.

Examination. A pelvic examination assesses the size, position and shape of the uterus. An ultrasound is not routine but may be arranged if fibroids, an unusual shape or unexplained bleeding are suspected.

What is usually not required: a cervical screening test on the day, a blood test, a partner’s consent, or a prior pregnancy.

Clinicians also spend time on informed consent: how the device works, the usual side effects, the small risks, and how to check the threads. The MedlinePlus overview of IUDs describes this counseling as part of standard care. The requirements, in the end, are about safety and choice, not about proving worthiness.

What happens on insertion day

The appointment itself is shorter than the anticipation. Knowing the steps takes some of the edge off.

After the history and pregnancy check, the person lies on an examination couch as for a smear test. A speculum, the instrument that gently holds the vaginal walls apart, is inserted so the cervix can be seen. The clinician cleans the cervix and may apply a local anesthetic. A thin instrument measures the depth of the uterus, which determines how the device is positioned. The IUD is then passed through the cervix inside a slim tube, released, and the tube is withdrawn. Finally the threads are trimmed to sit just inside the vagina.

The NHS describes the fitting as taking about five to ten minutes, with the whole appointment lasting around twenty to thirty minutes. Most people feel cramping, ranging from mild to intense, as the device passes through the cervix. A minority feel faint or nauseated for a few minutes afterward, which is a reflex response to the cervix being touched rather than a sign of harm. Bringing someone to travel home with, and not planning anything strenuous for the rest of the day, is sensible.

Pain is real and varies widely. People who have never given birth, or who are anxious, tend to report more discomfort. Comfort options differ between services and may include local anesthetic gel or injection, over-the-counter pain relief taken beforehand as advised by the clinician, or in some settings sedation. Asking in advance what is available is reasonable, and any decision about medicines belongs with the prescribing clinician.

The small procedural risks are worth naming plainly. The NHS reports that the device is pushed out, or expelled, in fewer than 1 in 20 people, most often in the first year, and that perforation, where the device passes through the uterine wall, occurs in roughly 1 in 1,000 fittings. Infection risk is low and concentrated in the first weeks.

The following days and weeks: what usually happens

The first month tells a person most of what they need to know about living with the device, and the pattern differs by type.

The first 48 hours. Period-like cramps and light bleeding or spotting are usual for a day or two. Sanitary pads rather than tampons are often suggested until the bleeding settles, and sex can resume once the person feels comfortable, though the NHS advises extra contraception for the first seven days if a hormonal device was fitted outside the first week of the cycle.

The first three to six months. This is the adjustment window. With a copper IUD, the NHS notes periods commonly become heavier, longer or more painful, typically improving after a few months. With a hormonal IUD, the more usual experience is irregular spotting or light bleeding that can be unpredictable, gradually easing over three to six months as the lining thins. After that, most people with hormonal devices find periods lighter than before, and some stop bleeding altogether. Neither pattern is a sign that something is wrong, but persistent heavy bleeding or pain merits a check.

Follow-up. The NHS recommends a check three to six weeks after fitting to confirm the device is in place and that there are no problems. Many services also teach people to feel for the threads at the top of the vagina after each period, especially in the first months when expulsion is likeliest. Not being able to feel them, or feeling the hard plastic of the device itself, is a reason to use additional contraception and arrange a check.

Longer term. Once settled, the device needs no daily attention. It can be removed at any point by a clinician, and fertility returns promptly. Replacement is planned toward the end of the licensed duration, which the team will note in the person’s records.

The everyday reality, for most, is that within a season the device fades into the background. The exceptions are exactly what the red-flag section later in this article is for.

Do you gain weight getting an IUD? Side effects, sorted by evidence

The question ‘do you gain weight getting an IUD’ ranks among the most searched, so it deserves a careful answer rather than a reassuring wave.

For the copper device, the answer is straightforward. It contains no hormone, does not alter ovulation or appetite, and has no plausible mechanism for changing weight. Weight changes that follow a copper fitting are coincidental, though no less real to the person experiencing them.

For the hormonal device, the picture is more nuanced but still reassuring. The Cleveland Clinic and Mayo Clinic both list weight change among possible side effects reported by users, while noting that studies comparing hormonal IUD users with copper IUD users have generally found no meaningful difference in weight gain between the two groups over time. Because copper users gain a similar amount, the modest average weight increase seen in both groups appears to reflect ordinary aging rather than the hormone. The levonorgestrel dose reaching the bloodstream from an IUD is far lower than from pills or injections, which fits with this finding.

Other side effects, ranked roughly by how often they trouble people:

• Irregular bleeding or spotting with the hormonal device, common in the first months and usually settling.
• Heavier or more painful periods with the copper device, again usually easing after several months.
• Hormonal effects such as headache, breast tenderness, acne or mood changes, reported by some hormonal IUD users and generally mild; evidence linking the device to depression is mixed.
• Small ovarian cysts on scans in hormonal IUD users, which usually resolve without treatment.

Anyone worried about a change in weight, mood or skin after fitting should raise it with their clinician rather than assume the device is to blame or stop looking for other causes. Removal is always an option, and the decision sits with the person and their care team.

What people often get wrong about IUD eligibility

Some myths about who can get an IUD have outlived the evidence that once fed them by thirty years. A few corrections, each grounded in current guidance.

‘You must have had a baby first.’ No. The CDC grades never having given birth as category 2, acceptable, for both device types. The belief traces to an era of different devices and different infection rates.

‘IUDs cause infertility.’ Current evidence does not support this. The WHO and CDC criteria conclude that IUDs do not increase the risk of infertility, and fertility returns quickly after removal. The infection-related tubal damage seen with a withdrawn device decades ago is not seen with modern ones.

‘A past STI or PID means no IUD, ever.’ Only a current infection is a barrier. A treated past infection is category 1 or 2.

‘The copper IUD is the natural, easy option for everyone.’ It is hormone-free, but the NHS specifically flags that it may be unsuitable for people who already have heavy or painful periods, because it can make both worse.

‘The hormonal IUD floods you with hormones.’ Levonorgestrel acts mainly inside the uterus, and blood levels are lower than with pills. Systemic side effects occur but are generally mild.

‘IUDs cause abortions.’ Both types work primarily by preventing fertilization; the copper device also makes implantation unlikely. Neither disrupts an established pregnancy.

‘You cannot use tampons or a menstrual cup.’ Both are fine once initial bleeding has settled; the usual advice is to take care not to tug on the threads when removing a cup.

‘Doctors will refuse if you’re under 18 or over 45.’ There is no upper or lower age bar for fitting in NHS or CDC guidance.

The thread connecting these myths is that they all describe a person’s identity or history rather than a current medical condition. The real eligibility list is almost entirely about the present.

Questions to ask your care team

Bringing a short list to the appointment makes it more likely the fitting fits the person rather than the other way round. The questions below are the ones clinicians report wishing people asked more often.

• Given my periods, which device type would you lean toward, and why?
• Do I need an STI test or a scan before fitting, or can everything happen today?
• What comfort options do you offer during insertion, and is there anything I should do beforehand?
• If I have fibroids or an unusual uterine shape, how would you know, and would it change the plan?
• How long is this particular device licensed for, and when would you want to review it?
• What bleeding pattern should I expect in the first three months, and what would make you want to see me sooner?
• How do I check the threads, and what do I do if I cannot feel them?
• If I decide the side effects are not for me, how quickly can it be removed?
• Will this affect any other medicines or conditions I have?
• Do you recommend a follow-up visit, and when?

It is also worth saying out loud what matters most. Some people care above all about never having a period again; others would rather bleed heavily than use a hormone; some are chiefly afraid of the pain of insertion. Clinicians cannot weigh priorities they have not heard. A person who says ‘irregular spotting would drive me to remove it’ will get different counseling from one who says ‘I just want it to work and forget it.’

Finally, ask what to do if something feels wrong afterward. Knowing who to contact and when, before leaving the room, turns the red-flag list below from a worry into a plan.

When to call your doctor

Serious problems after IUD insertion are uncommon, but they are time-sensitive when they happen. The NHS and Mayo Clinic guidance agree on the signs that should prompt a same-day call to the care team or urgent care rather than waiting for a routine check.

Contact a clinician urgently if any of the following occur:

• Lower abdominal or pelvic pain that is severe, worsening, or not settling within a few days of fitting.
• Fever, chills, or feeling generally unwell in the weeks after insertion, which can signal pelvic infection.
• Vaginal discharge that is unusual in color or smell, particularly alongside pain or fever.
• Heavy bleeding that soaks through a pad every hour for several hours, or bleeding accompanied by dizziness or faintness.
• Pain during sex that is new or severe.
• Being unable to feel the threads, feeling them noticeably longer, or feeling the hard end of the device itself, which may mean it has moved or been expelled; use additional contraception until it has been checked.
• A positive pregnancy test or a missed period with symptoms of pregnancy while the device is in place. Pregnancy with an IUD is rare but carries a higher chance of ectopic pregnancy, where the pregnancy grows outside the uterus, so it needs prompt assessment.
• Sudden sharp one-sided pelvic pain with shoulder-tip pain or collapse, which can indicate ectopic pregnancy or, very rarely, perforation, and is an emergency.

Less urgent but still worth raising at a routine appointment: irregular bleeding that persists beyond six months, periods that remain much heavier than before, persistent mood or skin changes, or simply a sense that the device is not right for you.

None of this should read as a warning against the method. Most people never need this list. Its purpose is to make sure that when something does feel wrong, it is checked quickly by the team responsible for the device, who are the only ones who can examine, scan and decide.

Frequently asked questions

What disqualifies you from getting an IUD?

The main disqualifiers are pregnancy, a current pelvic infection or untreated chlamydia or gonorrhea, unexplained vaginal bleeding that has not been evaluated, cervical or endometrial cancer, a uterine cavity distorted by fibroids or a congenital anomaly, and pelvic tuberculosis. Current breast cancer rules out the hormonal device only. Several of these are temporary; once an infection is treated or bleeding is explained, eligibility is reassessed by the clinician.

What are the requirements to get an IUD?

The essential requirement is that pregnancy has been excluded, usually by history or a urine test. Clinicians also take a health history, may offer chlamydia and gonorrhea testing to people at higher risk, and perform a pelvic examination to assess the uterus. A prior pregnancy, a partner’s consent, a blood test or a same-day cervical screening are not required. An ultrasound is arranged only if the uterine shape is in question.

Who is not eligible for an IUD?

People who are pregnant, have an active pelvic infection, have unexplained bleeding awaiting diagnosis, have certain cancers of the cervix or uterine lining, or have a uterus whose shape cannot hold the device are generally not offered one. Someone with a copper allergy is steered away from the copper device, and someone with current breast cancer from the hormonal device. Age, weight and never having had children do not affect eligibility.

Do you gain weight getting an IUD?

The copper IUD has no hormone and no known effect on weight. For the hormonal IUD, some users report weight change, but comparison studies cited by Mayo Clinic and Cleveland Clinic have generally found similar weight changes in copper and hormonal IUD users over time, pointing to ordinary aging rather than the device. Anyone concerned about weight after fitting should discuss it with their clinician rather than assume the cause.

Can I get an IUD if I have heavy periods?

Yes, and a hormonal IUD may be offered specifically to treat them, because it thins the uterine lining and usually makes periods lighter over several months. The copper IUD is different: the NHS notes it can make periods heavier and may be unsuitable for people who already bleed heavily. Clinicians will usually want to understand the cause of heavy bleeding first, which may involve a blood count or ultrasound.

Can I get an IUD if I had PID or chlamydia in the past?

In most cases, yes. CDC eligibility criteria grade a past, resolved pelvic inflammatory disease as category 1 or 2, meaning acceptable, for both device types. A treated past STI does not lower eligibility either. What matters is whether an infection is present now; a current infection is treated first and the device fitted afterward. Testing may be offered at the appointment for people at higher risk.

Can teenagers get an IUD?

Yes. The CDC grades both hormonal and copper IUDs as acceptable for people under 20, and the NHS states there is no lower age limit as long as the person is sexually active. Insertion may be more uncomfortable in people who have not given birth, so asking about comfort options is reasonable. Expulsion is slightly more common in younger users, which is why thread checks are encouraged.

How soon after having a baby can an IUD be fitted?

According to NHS guidance, an IUD can be fitted within about 48 hours of a vaginal or cesarean birth, or from around four weeks afterward. Breastfeeding is compatible with both device types. The one situation that delays fitting is infection of the uterus after delivery, which needs treatment first. Fitting immediately after a miscarriage or abortion is also acceptable unless infection is present.

Does an IUD protect against sexually transmitted infections?

No. Neither the copper nor the hormonal IUD protects against chlamydia, gonorrhea, HIV or other infections. People with a new or non-monogamous partner are advised to use condoms alongside the device. This is also why STI screening is offered around the time of fitting for people at higher risk, since an infection present at insertion is the main driver of the small early infection risk.

How long does an IUD last and can it be removed early?

The NHS states that copper IUDs last 5 to 10 years and hormonal IUDs 3 to 8 years, depending on the specific device, which the care team will record. Either type can be removed at any time by a clinician in a brief procedure, and fertility usually returns quickly. Removal is a personal decision made with the treating team, whether for side effects, planning a pregnancy or changing methods.

References

• NHS: IUD (intrauterine device) or copper coil
• WHO: Medical eligibility criteria for contraceptive use, fifth edition
• NHS: Heavy periods
• MedlinePlus: Intrauterine devices (IUD)

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.