Does Mirena become ineffective if it shifts position?

Nov 14, 2025 Source: Cainiu Health

Dr. Zhang Lu

Introduction

In general, Mirena is an intrauterine device primarily used for contraception and the treatment of certain gynecological conditions. Whether it becomes ineffective due to displacement mainly depends on the extent and location of the shift. Pay attention to bodily changes; if abnormal vaginal bleeding, persistent lower abdominal pain, or unusual discharge occurs, seek medical evaluation promptly. Avoid strenuous exercise and heavy physical labor to reduce the risk of displacement.

Generally, Mirena is an intrauterine device (IUD) primarily used for contraception and the treatment of certain gynecological conditions. Whether it becomes ineffective due to displacement mainly depends on the extent and location of the shift. The specific analysis is as follows:

If Mirena has only slightly shifted but remains within the appropriate area of the uterine cavity, has not prolapsed through the cervical os, and examination confirms that the released medication can still act normally on the endometrium, it will not lose effectiveness. In such cases, it can continue providing contraceptive or therapeutic benefits for gynecological conditions, and immediate adjustment or removal is unnecessary.

However, if the displacement is severe—such as when Mirena has completely moved out of the uterine cavity, shifted into the uterine muscle layer, or migrated outside the uterus—it can no longer release medication properly or maintain the correct position required for contraception. This results in loss of effectiveness, meaning it neither prevents pregnancy nor effectively treats gynecological conditions. In such cases, prompt medical attention is needed for removal or reinsertion.

In daily life, pay attention to bodily changes. Seek medical evaluation promptly if you experience abnormal vaginal bleeding, persistent lower abdominal pain, or unusual discharge. Avoid intense physical activity and heavy labor to reduce the risk of displacement. Maintain good external genital hygiene by washing with warm water and avoid unclean contact to prevent infection. Follow your doctor's recommendations for regular check-ups to confirm the proper positioning of Mirena and ensure its continued effectiveness.

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