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Last updated: April 8, 2026

Quick Answer: While the risk is low, an IUD (intrauterine device) can indeed fall out or be expelled from the uterus. This most commonly occurs within the first few months after insertion, and the risk is higher for certain individuals. Regular checks by a healthcare provider are crucial to ensure the IUD remains in place.

Key Facts

The risk of an IUD falling out, or expulsion, is approximately 1-10%, with the highest risk in the first year after insertion.
Expulsion is more likely to occur during menstruation.
Factors increasing the risk include a recent pregnancy, very heavy or painful periods, and certain uterine abnormalities.
If an IUD is expelled, it is no longer effective for preventing pregnancy, and there's a risk of pregnancy if unprotected sex occurs.
Regular checks by a healthcare provider, including self-checks of the IUD strings, are important for ensuring the device is in place.

Overview

The intrauterine device (IUD) is a highly effective and long-acting form of reversible contraception. It's a small, T-shaped device inserted into the uterus by a healthcare professional. While generally safe and reliable, like any medical device, there are potential complications, one of which is the possibility of the IUD falling out or being expelled. This is a concern for many individuals considering or using an IUD, and understanding the likelihood, contributing factors, and implications is important for informed decision-making.

The expulsion of an IUD is not a common occurrence, but it is a recognized risk. When an IUD is expelled, it means it has moved from its intended position within the uterus, either partially or completely. This can happen shortly after insertion or even months or years later, though the initial period after placement carries a higher risk. Recognizing the signs and knowing what steps to take if expulsion is suspected is vital for maintaining contraceptive protection and reproductive health.

How It Works

Mechanism of the IUD: Both hormonal and non-hormonal (copper) IUDs work primarily by preventing fertilization. Hormonal IUDs release a small amount of progestin, which thickens cervical mucus, making it difficult for sperm to reach the uterus, and also thins the uterine lining. The copper IUD, on the other hand, releases copper ions that are toxic to sperm, preventing them from reaching or fertilizing an egg.
Insertion Process: The insertion of an IUD is a relatively quick procedure performed by a trained healthcare provider. It involves using a speculum to visualize the cervix and then a special inserter to carefully guide the IUD through the cervix and into the uterus. The arms of the IUD unfold once inside the uterine cavity.
Uterine Environment: The uterus is a muscular organ with a unique environment designed to carry a pregnancy. While the IUD is designed to be well-tolerated, the uterus can sometimes react to the presence of a foreign object by attempting to expel it. This is a natural defense mechanism that the body may employ.
Risk of Expulsion: The expulsion rate for IUDs is generally low, with estimates varying between 1% to 10% over the first year of use. This risk is most pronounced in the first few months following insertion, particularly during the first menstrual period after placement. The reasons for expulsion are not always clear but can be related to the individual's uterine anatomy or the body's response to the device.

Key Comparisons

Feature	Hormonal IUD (e.g., Mirena, Kyleena)	Copper IUD (e.g., Paragard)
Mechanism	Releases progestin, thickens cervical mucus, thins uterine lining.	Releases copper ions toxic to sperm.
Expulsion Rate	Slightly lower than copper IUDs, estimated 1-5% in the first year.	Slightly higher than hormonal IUDs, estimated 2-10% in the first year.
Associated Side Effects	Irregular bleeding, lighter periods, amenorrhea (no periods).	Heavier and longer periods, increased cramping.
Duration of Use	3-8 years, depending on the specific brand.	Up to 10-12 years.

Why It Matters

Impact on Contraceptive Efficacy: If an IUD is expelled, its ability to prevent pregnancy is significantly compromised. This means that unprotected intercourse following an expulsion could lead to an unintended pregnancy. The effectiveness of IUDs is among the highest of all reversible contraceptive methods when correctly placed.
Risk Factors for Expulsion: Several factors can increase the likelihood of an IUD being expelled. These include having a very heavy or painful menstrual period, being underweight, having a history of spontaneous abortion or miscarriage, or having a uterine abnormality such as a bicornuate uterus (a heart-shaped uterus). Insertion during the postpartum period or soon after an abortion may also carry a slightly higher risk.
Recognizing Signs of Expulsion: Individuals using an IUD should be aware of potential signs that the device may have moved or been expelled. These can include feeling pain or cramping in the lower abdomen or back, experiencing heavier or irregular bleeding, noticing changes in menstrual flow, or feeling the IUD strings shorter, longer, or not feeling them at all. A feeling of the device itself in the vaginal canal is also a definitive sign.
Importance of Follow-up: Regular check-ups with a healthcare provider are crucial after IUD insertion. The first check-up is typically scheduled a few weeks to a few months after insertion to ensure the IUD is in the correct position and to address any concerns. Many healthcare providers also recommend that individuals learn to feel for their IUD strings periodically to confirm its placement.

In conclusion, while the possibility of an IUD falling out exists, it is a relatively uncommon event. The benefits of IUDs in terms of highly effective, long-term contraception often outweigh this small risk for many individuals. By being informed about how IUDs work, understanding the potential for expulsion, recognizing its signs, and maintaining regular contact with healthcare providers, users can maximize the benefits and minimize the risks associated with this popular contraceptive method.