Cup & IUD (IUD) ᐅ Risks • Good practices

When using a CUP, a warning is regularly repeated: the menstrual cup could cause the expulsion of the IUD by suction cup effect… We wanted to know if this is true or not.

The IUD, or Intra-Uterine Device (IUD for intimates), is a method of contraception which consists of inserting a T-shaped device into the uterus, ending in a thread that comes out of the cervix. the uterus into the vagina.

There are two kinds: copper, a spermicidal material, and locally diffusing hormones. You can get one at any age, whether you have had children or not.

It is easy to avoid this famous suction cup effect by removing the cup. Just pinch it at its base. Attention, it must be done delicately because it can make the menstrual cup slightly overflow, but it is not very complicated. If your fingers can’t reach the protection to pinch it, just push with your perineum muscles to lower it a little.

However, this famous suction cup effect which would cause the loss of the IUD is more a theory, to be taken with tweezers. Midwife Caroline Reiniche explains the limits:

“Even if the patient has not taken care to avoid the suction cup effect, the call for air can go to the cervix, but not to the uterus where the IUD is, because it does not contain no air! It is wedged between the walls of the uterus, so it cannot be “sucked out”.

The expulsion is in all cases due to contractions of the uterus. The question is whether the cut can in some cases cause contractions responsible for an increased risk of expulsion. »

To answer this question, the doctor Maëlle Thouret looked into the question in a study on the links between the expulsion of the IUD and the use of a cup. It is the only one in France to have made one on this subject.

study on the use of the cup with an IUD: the findings

This doctor followed 207 patients, including 75 who used the menstrual cup over a year. 10.5% of women who protect themselves during their period with a cup expelled their IUD, compared to 4.2% without.

In addition, 75% of menstrual cup users who expelled their IUD did so during their menstruation, while none of the non-user patients lost their IUD during this period…

Midwife Caroline Reiniche tempers:

“This is a first study, on small numbers, it cannot be enough to be categorical about the existence of an excess risk. Further studies are needed to confirm a correlation between the use of a cup and the risk of expelling an IUD, but also to explore the mechanism involved.”

The study underlines the risks of using the menstrual cup in patients carrying an IUD but remains for the moment too weak to suggest its contraindication. We can also read there, in conclusion:

“The additional analysis relating to the effective use of the menstrual cup, however, highlights an expulsion rate four times higher than that of patients not using the menstrual cup”

should we stop wearing a cup with an IUD?

Some doctors have been banning their patients for years, yet, as Dr. Reiniche explains, there is no consensus on this subject among medical staff.

“I would say that in the current state of knowledge, it is reasonable to convey to the people concerned the existence of a doubt about a correlation between the two devices, without trying to frighten them, and without making a counter -indication until it is based on solid data.

There are a lot of overlaps in the reasons that can lead to choosing an IUD and a menstrual cup: saving money, absence of hormones or toxic products, desire to stay in touch with your body…”

So the best thing is always to make the choices that suit you the most.

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Cup & IUD (IUD) ᐅ Risks • Good practices


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