An intrauterine device (IUD) offers a long-term, reversible method of birth control. These small, T-shaped devices are placed inside the uterus by a healthcare provider. A normal component of an IUD is one or two thin strings that extend from the device through the cervix into the upper part of the vagina. Many new users have questions about these strings, particularly how they feel after insertion.
Typical Softening Timeline
IUD strings are made from a thin, flexible plastic material designed to be biologically inert and durable. Initially, these strings may feel stiff or like a “fishing line” right after insertion. This initial firmness is normal.
The strings begin to soften and become less noticeable within the first few weeks to a few months after insertion. Over time, they naturally conform to the contours of the vagina and cervix. This process allows the strings to coil up against the cervix, making them less detectable over time.
Influencing Factors
Several factors can influence how quickly IUD strings soften. The inherent flexibility of the specific plastic polymer used in the strings plays a role. As the strings settle, they may curl or coil around the cervix, which makes them feel softer.
Individual body chemistry and the unique anatomy of the cervix and vaginal canal can also affect how soft the strings feel. For some individuals, the strings might consistently feel like small wires, even after several months. Partners may occasionally feel the strings during intercourse. If the strings cause persistent discomfort during sexual activity, a healthcare provider can often trim them shorter.
When to Contact Your Doctor
Monitoring your IUD strings regularly is important to ensure the device remains in place. You should contact your healthcare provider if the strings feel significantly longer or shorter than they did before, or if you can no longer feel them at all. While missing strings do not always indicate a problem, they can suggest the IUD has moved or been expelled.
It is also important to seek medical attention if the strings feel sharp, poke, or cause persistent discomfort to you or your partner. Experiencing unusual pain, severe cramping, heavy bleeding, or any signs of infection such as fever, chills, or unusual discharge, warrants immediate contact with your doctor. If you can feel the hard, plastic part of the IUD itself, this is a sign of potential expulsion and requires prompt medical evaluation. If you suspect your IUD has moved or is causing problems, use a backup birth control method until a healthcare provider can confirm its position.