Copper IUD vs. hormonal IUD
Updated August 2026
Quick answer: The copper IUD and the hormonal IUD are both small devices that sit in the uterus and prevent pregnancy over 99% of the time — but they do opposite things to your periods. The copper IUD (Paragard in the US) uses no hormones at all and lasts up to 10 years, but it usually makes periods heavier and cramps worse. Hormonal IUDs like Mirena usually make periods much lighter and often stop them. If heavy or painful periods brought you here, the hormonal IUD is almost certainly the better fit.
Key facts
- Both IUDs are over 99% effective — the difference in effectiveness is not worth choosing on.
- The copper IUD contains no hormones at all; hormonal IUDs release a progestin inside the uterus.
- The copper IUD usually makes periods heavier and cramps worse, especially in the first 3–6 months.
- Hormonal IUDs usually make periods much lighter, and many people stop bleeding altogether.
- The copper IUD lasts up to 10 years; hormonal IUDs last 3–8 years depending on the type.
- Placed within 5 days of unprotected sex, the copper IUD is the most effective emergency contraception there is.
Copper IUD vs. hormonal IUD: full comparison table
| COMPARE | Copper IUD | Hormonal IUD |
|---|---|---|
| What it is | A hormone-free T-shaped device wrapped in copper, lasting up to 10 years | A small T-shaped device placed in the uterus |
| Hormones | No hormones | Progestin only |
| How you use it | Small device inserted by a clinician | Small device inserted by a clinician |
| How often you think about it | Up to 10 yrs | 3–8 yrs |
| Pregnancy prevention (typical use) | 99.2% | 99.8% |
| Pregnancy prevention (perfect use) | 99.4% | 99.8% |
| What happens to periods | Periods often heavier | Periods may stop |
| Getting started | A clinician places it during a short appointment. Insertion can cause strong cramps for a minute or two. | Same procedure, same short appointment, same cramps. |
| First few months | Heavier periods and stronger cramps are common at first, and don't settle for everyone. | Irregular spotting and cramping at first, which usually settles as periods lighten. |
| Hormonal side effects | None — there are no hormones to cause them. | Possible but limited: most of the hormone stays in the uterus, so effects like breast tenderness or mood changes are less common than with pills. |
| Stopping | Removed in minutes; fertility and your natural cycle return right away. | Same — removed in minutes, and fertility returns right away. |
The hormone question: what hormone-free buys you
The copper IUD's pitch is simple: nothing hormonal, ever. No progestin, no estrogen, no hormonal side effects, no mood effects, nothing systemic. Your natural cycle keeps running exactly as it always has — the copper just makes the uterus a hostile place for sperm. For people who have felt bad on hormonal birth control, or who simply want their body left alone, that's a real and legitimate draw.
But hormone-free cuts both ways. The hormone in a hormonal IUD is also what delivers the period benefits — lighter bleeding, easier cramps, often no periods at all. The copper IUD gives you none of that: your periods stay your periods, and usually get heavier. On a site about period pain, that trade deserves to be said plainly. If heavy or painful periods are part of why you're reading this, the copper IUD is usually the wrong pick.
What each IUD does to your periods and cramps
This is the real deciding factor. Copper works by causing a mild local inflammatory reaction inside the uterus — that reaction is part of how it stops sperm, and it's also why periods on the copper IUD tend to be heavier, longer, and crampier, especially in the first 3 to 6 months. For some people it settles back toward normal over time; for others, heavier periods are simply life with the copper IUD.
The hormonal IUD pushes in the opposite direction. Its progestin thins the uterine lining right where bleeding starts, so periods usually get much lighter over the first months — about 1 in 5 Mirena users stop having periods by the first year, rising to around half after several years. Stopped periods on a hormonal IUD are safe: the lining simply stays thin, so there is nothing that needs to shed.
Effectiveness, lifespan, and emergency contraception
On pure pregnancy prevention this is a tie: both are over 99% effective, because neither depends on you remembering anything. The copper IUD lasts up to 10 years; hormonal IUDs last 3 to 8 depending on the type. Fertility returns right away after removing either one.
The copper IUD holds one unique card: emergency contraception. Placed by a clinician within 5 days of unprotected sex, it's the most effective emergency contraception available — more reliable than any morning-after pill — and then it keeps protecting you for up to a decade. In the US that means Paragard; in Canada, copper IUDs like Mona Lisa fill the same role.
Which should you choose?
Choose the copper IUD if:
- You want zero hormones — no hormonal side effects, no mood effects, and your natural cycle untouched.
- Your periods are already light and manageable, so heavier ones would be a fair trade.
- You want the longest protection available: up to 10 years.
- You need emergency contraception and want it to double as long-term birth control.
Choose the hormonal IUD if:
- Heavy or painful periods are part of the problem you're solving — this is the one built for that.
- You'd welcome lighter periods, or none at all.
- Your cramps are already bad, and you're not willing to risk making them worse.
- You want hormones kept local: very little of an IUD's progestin reaches the rest of your body.
Frequently asked questions
Does the copper IUD make periods heavier?
Usually, yes — especially in the first 3 to 6 months. Copper causes a mild inflammatory reaction inside the uterus; that reaction is part of how it stops sperm, but it also means heavier, longer, crampier periods for many people. For some it settles over time, but heavier bleeding is the most common reason copper IUDs are removed early.
Is the copper or hormonal IUD more effective?
They're effectively tied. Both work over 99% of the time, because both sit in the uterus and work around the clock with nothing to remember. The tiny difference between their numbers isn't worth choosing on — pick based on what you want your periods to do, not on effectiveness.
Which IUD is better for heavy or painful periods?
The hormonal IUD, clearly. It releases a progestin right inside the uterus, which usually makes periods much lighter and often stops them — higher-dose versions like Mirena are approved specifically to treat heavy bleeding. The copper IUD usually pushes the other way: heavier periods and worse cramps.
Does the copper IUD have any hormones at all?
None. It's a small plastic frame wrapped in copper, and the copper itself does all the work. Nothing enters your bloodstream, your natural cycle keeps running, and there are no hormonal side effects — that's the whole appeal for many people who choose it.
Can the copper IUD be used as emergency contraception?
Yes — it's the most effective emergency contraception there is. If a clinician places it within 5 days of unprotected sex, it works better than any morning-after pill, and then it keeps preventing pregnancy for up to 10 years. The catch is practical: you need an appointment within those 5 days.
Which IUD lasts longer?
The copper IUD: up to 10 years from one insertion. Hormonal IUDs last 3 to 8 years depending on the type — Mirena and Liletta go up to 8, Kyleena 5, and Skyla 3. Both kinds can be removed whenever you want, and fertility comes back right away.
Does insertion hurt more with one than the other?
No — it's the same procedure with the same short, strong cramps, and there's no strong evidence that either device hurts more going in. What differs is afterward: copper IUD users tend to have crampier periods long-term, while hormonal IUD cramping usually eases as periods lighten. Either way, ask about pain relief options before the appointment.
Can I switch from a copper IUD to a hormonal one?
Yes, and people do — most often because of heavy periods. A clinician can usually remove the copper IUD and place a hormonal one in the same appointment. If bleeding on the copper IUD is wearing you down, you don't have to wait out its 10 years.
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