On this page 5 sections
Quick answer
- Both coils are over 99% effective and reversible straight away.
- Copper IUD: hormone-free, 5–10 years, may make periods heavier.
- Hormonal IUS: 3–8 years, often makes periods lighter.
- Know the warning signs after fitting and check your threads.
Both coils are small T-shaped devices a doctor or nurse places in your womb. Both are over 99% effective, and fertility returns straight away when they’re taken out. The big difference is hormones.
Copper coil (IUD)
- Hormone-free – works by releasing copper
- Lasts 5 or 10 years depending on type
- Works as soon as it’s fitted
- Can also be used as emergency contraception
- Periods may become heavier, longer or more painful – this can improve after a few months
Hormonal coil (IUS)
- Releases progestogen into the womb
- Lasts 3 to 8 years depending on type (e.g. Mirena, Kyleena, Jaydess)
- Often makes periods lighter, shorter and less painful
- Can be used to treat heavy periods and as part of HRT later in life
Fitting
Fitting takes a few minutes and can be uncomfortable or painful for some people. It’s okay to ask about pain relief options before your appointment. Period-like cramps for a few days afterwards are common.
MythYou can’t have a coil if you haven’t had a baby.
Coils are suitable for many people who have never been pregnant. A clinician will check if it’s right for you.
Sources
Written by the Splash teamSources checked
This is general information, not medical advice. Splash can’t diagnose. If you’re worried, talk to a GP, pharmacist or sexual health clinic. In an emergency call 999 (UK) or 911 (US). How we write and check articles.