IUS (hormonal coil)

What does IUS mean?

IUS (hormonal coil): A small T-shaped device in the womb that releases progestogen. Lasts 3 to 8 years.

How it is used in the Splash library

• The hormonal coil (IUS), which thins the lining and lightens periods.

  From “Adenomyosis: endo’s lesser-known cousin”

• If they are, NICE guidance for heavy periods says that for fibroids under 3cm that do not distort the womb cavity, a hormonal coil (IUS) is considered first.

  From “Fibroids: common, non-cancerous, worth knowing”

• Hormonal contraception such as the pill, injection or IUS

  From “Missing periods (amenorrhoea)”

• Hormonal coil (IUS) – over 99%.

  From “Every contraception method, compared”

• Hormonal coil (IUS)

  From “Coils: copper IUD vs hormonal IUS”

IUS (hormonal coil) explained

An IUS (intrauterine system), often called the hormonal coil, is a small T-shaped plastic device placed in the womb that releases a progestogen hormone. It thickens cervical mucus, thins the womb lining and, in some people, stops ovulation.

It is over 99% effective and lasts 3 to 8 years, depending on the type (NHS).

What's typical

Periods often become lighter, shorter or less painful, and for some they stop altogether. Irregular bleeding or spotting is common in the first 3 to 6 months.

Some people notice hormonal side effects such as spots, breast tenderness or mood changes, which usually settle.

It is also a first-line treatment for heavy periods (NICE NG88), and can be used as the progestogen part of HRT.

When to talk to a GP, nurse or pharmacist

• You can't feel the threads, or you have pain, fever or unusual discharge after fitting.
• Bleeding is heavy or doesn't settle after 6 months.
• You think you might be pregnant, especially with one-sided pain.

In the UK you can call NHS 111 for advice at any time. In an emergency call 999 (UK) or 911 (US). This is general information, not medical advice.