Does the Mirena IUD cause weight gain?

For most users, Mirena has little measurable effect on weight. Weight gain is listed as a possible side effect that some people report, but high-quality evidence that the IUD itself causes significant weight gain is limited.

Why does Mirena have less weight effect than the shot?

Mirena releases its hormone mostly inside the uterus, so whole-body hormone levels are low. The birth control shot delivers a systemic progestin and is the method most consistently linked to weight gain.

I gained weight after getting Mirena, is it the IUD?

Possibly, but not necessarily. An IUD stays in for years, over which weight changes for many reasons. Some users report bloating that feels like weight gain. Your provider can help you sort out the cause.

Will I lose weight if I remove Mirena?

There is no reliable evidence that removing the IUD causes weight loss, since it is not a strong cause of weight gain to begin with. Don't have it removed over weight without discussing it with your provider.

Is there a birth control with no weight effect?

The non-hormonal copper IUD has no hormonal weight effect. The hormonal IUD, pill, patch, and ring also lack strong evidence of significant weight gain for most people.

Does Mirena Cause Weight Gain?

By Mustafa Bilgic · Updated June 2026 · Reviewed against guidance from ACOG, the Mayo Clinic, MedlinePlus (NIH), and the product information.

Educational information, not medical advice. This page summarizes what research and product information report. It is not a substitute for advice from your doctor and not a recommendation for or against the Mirena IUD. Decisions about contraception should be made with your healthcare provider. Operator: Mustafa Bilgic.

Mirena is a hormonal intrauterine device (IUD) that releases a small, steady amount of the progestin levonorgestrel directly into the uterus. Because the hormone acts mostly locally, blood levels are low compared with pills or the shot. So does it cause weight gain? The balanced answer: studies generally show little effect on weight for most users, weight gain is listed among possible side effects that some people report, and high-quality evidence that the IUD itself drives significant weight gain is limited.

The short answer

For most people, the Mirena IUD has little measurable effect on weight. Weight gain is listed in the product information as a side effect reported by some users, but well-designed studies do not establish the IUD as a strong cause of significant weight gain. Many users see no meaningful change.

Key point: Because Mirena delivers hormone mostly inside the uterus, the amount reaching the rest of the body is low — one reason its systemic effects, including on weight, tend to be limited compared with methods like the injectable.

How Mirena works (and why hormone levels are low)

Mirena slowly releases levonorgestrel locally in the uterus, thickening cervical mucus and thinning the uterine lining to prevent pregnancy. This local action means systemic (whole-body) hormone exposure is lower than with oral or injectable progestins, which helps explain why systemic side effects, including weight changes, are generally limited for most users.

What the evidence shows

Studies of hormonal IUDs generally show little effect on body weight for most users. Where weight gain is reported, it is often modest and not clearly distinguishable from the weight changes that occur over time anyway. The product information lists weight increase among possible side effects, reflecting that some users do report it — but a listed side effect is not the same as a proven population-level cause. ACOG and major references describe hormonal IUDs as not strongly linked to significant weight gain.

Why some users report weight gain

Coincidental life changes. An IUD can stay in place for years, a span over which weight naturally fluctuates for many reasons unrelated to the device.
Bloating or fluid shifts. Some users report bloating, especially early on, which can feel like weight gain without being fat.
Individual sensitivity. A minority of people may be more sensitive to the progestin's effects.

Distinguishing a true drug effect from normal variation is hard, which is why population studies — rather than individual anecdotes — are the better guide to what the device typically does.

Mirena vs the shot vs the pill

Among hormonal methods, the birth control shot (Depo-Provera) is the one most consistently linked to weight gain. The hormonal IUD and the combined pill show much weaker or no evidence of significant weight gain. If avoiding weight gain is a priority, the IUD is generally considered a relatively weight-neutral hormonal option. See our birth control and weight gain overview for the full comparison, and our page on the Nexplanon implant.

What to do if you're concerned

Track the trend. Weigh under consistent conditions over weeks, not days.
Note other factors. Diet, activity, stress, sleep, and life stage all affect weight.
Talk to your provider. If you notice meaningful change, they can help you sort out the cause and discuss options.

For intentional healthy weight goals, our calorie calculator can help you understand your numbers.

Mustafa Bilgic

Operator of WeightGain.us, based in Adıyaman, Türkiye. Mustafa is an independent publisher, not a medical professional; every clinical statement here is attributed to the cited authorities (ACOG, Mayo Clinic, MedlinePlus/NIH, product information). For personal advice about Mirena, consult your own doctor.

Don't have your IUD removed over weight concerns without discussing it with your provider — removal affects your pregnancy risk and should be planned. Your provider can review whether the device is the likely cause and what the alternatives are.

When to see your doctor

Contact your provider for significant or rapid weight change, bothersome symptoms, or any of the warning signs described in the Mirena product information. Severe abdominal pain, signs of infection, or a suspected expulsion of the device need prompt medical attention.

Frequently asked questions

Does the Mirena IUD cause weight gain?: For most users, Mirena has little measurable effect on weight. Weight gain is listed as a possible side effect that some people report, but high-quality evidence that the IUD itself causes significant weight gain is limited.
Why does Mirena have less weight effect than the shot?: Mirena releases its hormone mostly inside the uterus, so whole-body hormone levels are low. The birth control shot delivers a systemic progestin and is the method most consistently linked to weight gain.
I gained weight after getting Mirena — is it the IUD?: Possibly, but not necessarily. An IUD stays in for years, over which weight changes for many reasons. Some users report bloating that feels like weight gain. Your provider can help you sort out the cause.
Will I lose weight if I remove Mirena?: There is no reliable evidence that removing the IUD causes weight loss, since it is not a strong cause of weight gain to begin with. Don't have it removed over weight without discussing it with your provider.
Is there a birth control with no weight effect?: The non-hormonal copper IUD has no hormonal weight effect. The hormonal IUD, pill, patch, and ring also lack strong evidence of significant weight gain for most people.

Related guides

References

Sources: ACOG — LARC: IUD and Implant · Mayo Clinic — Mirena (hormonal IUD) · MedlinePlus (NIH) — Levonorgestrel IUD · Drugs.com — Mirena · Planned Parenthood — IUD.