WomensPal Health Guide · Updated July 2026

IUD Side Effects: Hormonal vs Copper — What to Expect

The IUD is one of the most effective reversible contraceptives available — over 99% effective — but the side effect profile differs significantly between hormonal and copper types. Here's what to expect honestly, not just the best-case scenario.

Insertion: What Everyone Experiences

Most women experience cramping during and immediately after insertion — ranging from mild discomfort to intense pain. This is normal. The cervix is dilated to allow the device through, which triggers uterine cramping. Spotting for a day or two afterward is also common. Taking 400–800mg ibuprofen 1 hour before insertion helps significantly.

Hormonal IUD Side Effects (Mirena, Kyleena, Liletta, Skyla)

First 3–6 Months

Irregular spotting and bleeding — the most common complaint. Unpredictable light bleeding that gradually decreases over 3–6 months
Cramping — may persist for weeks after insertion
Mood changes — some women report mood swings, anxiety, or low mood, particularly in the first 3 months
Acne — levonorgestrel has mild androgenic activity; some women experience hormonal acne
Headaches — common in the adjustment period

Long-Term (After 6 Months)

Reduced or absent periods — Mirena eliminates periods entirely in about 20% of users within the first year. Most women have much lighter periods. This is a benefit for many, but a concern for others who want to track their cycle.
Ovarian cysts — functional cysts occur in about 12% of hormonal IUD users, usually resolve spontaneously
Lower libido — some women report reduced sex drive, though research is mixed

Copper IUD Side Effects (Paragard)

The copper IUD contains no hormones — it works by creating a sperm-hostile environment. Side effects are different:

Heavier, longer periods — the most significant downside. Periods typically become 20–50% heavier and more painful, especially in the first 3–6 months. This often improves but rarely returns to pre-IUD levels.
Worsened cramps — copper triggers local prostaglandin release, increasing uterine contractions and pain
Spotting between periods — common in the first few months
No hormonal side effects — mood, acne, and libido are not typically affected

Tracking after an IUD: If you have a hormonal IUD, WomensPal lets you log symptoms, energy, mood, and spotting even when your periods are suppressed — so you can stay in tune with your body and identify patterns that might otherwise be invisible.

Serious but Rare Side Effects (See a Doctor Immediately)

Expulsion: The IUD can partially or fully come out — check strings monthly. Symptoms: feeling the device, unusual cramping, or strings feeling longer or shorter.
Perforation: Rare (1 in 1,000 insertions). The IUD punctures the uterine wall. Usually occurs at insertion. Signs: severe pain after insertion that doesn't improve.
Ectopic pregnancy: IUDs are highly effective but if pregnancy occurs, there is a higher relative risk of ectopic. Symptoms: sharp one-sided pain, shoulder tip pain, dizziness.
PID: Risk is highest in the first 3 weeks after insertion. Signs: fever, severe pelvic pain, unusual discharge.

When Side Effects Improve

Most side effects for both IUD types peak in the first 3 months and significantly improve by 6 months. If side effects remain severe after 6 months, it may not be the right contraceptive for you — and removal is quick and easy.

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Frequently Asked Questions

What are the most common IUD side effects?

For hormonal IUDs (Mirena, Kyleena): irregular spotting, reduced or absent periods, mood changes, and sometimes acne. For copper IUDs (Paragard): heavier periods and worse cramps. Both types cause cramping at insertion that typically resolves within a few days.

How long do IUD side effects last?

Most side effects peak in the first 1–3 months and significantly improve by 6 months. Irregular spotting from hormonal IUDs usually settles into light or absent periods. Heavier periods from copper IUDs often improve after 3–6 months but may remain heavier than pre-IUD.

Can an IUD cause mood changes?

Some women report mood changes, anxiety, or low mood with hormonal IUDs, particularly Mirena. The levonorgestrel dose is much lower than in pills, so systemic effects are minimal — but some women are sensitive. If mood changes are significant, discuss removal with your doctor.

Does the copper IUD affect hormones?

No. The copper IUD (Paragard) is completely hormone-free and does not affect estrogen, progesterone, or testosterone levels. It works by creating a copper ion environment that is toxic to sperm. Mood, libido, and cycle hormones are not affected.

Can you track your cycle with an IUD?

Yes. With a copper IUD, your cycle continues normally. With a hormonal IUD, periods may be lighter or absent, but you can still track symptoms, ovulation signs, mood, and energy with WomensPal to understand your hormonal patterns even without regular bleeding.