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This is the number 1 question asked by IUD (Intrauterine Device) wearers to their gynecologist or midwife. Is the fear of the suction effect "vacuuming" the IUD justified?

The short answer is: YES, La Cup is compatible with an IUD. But beware: not just any cup, and not with just any movement. To understand why, we first need to look at how your IUD works.

1- Reminder: How does an IUD work?

The IUD (Intrauterine Device) is a small T-shaped device inserted into the uterus. There are two main types:

• The copper IUD: Hormone-free, it makes sperm inactive thanks to the copper. It has the reputation of sometimes making periods heavier (hence the benefit of a large-capacity menstrual cup!).
• The hormonal IUD: It releases a small amount of progestin to thin the uterine lining. It often makes periods very light, or even non-existent.

   

    The placement of your IUD  

2- The mechanics of removal: Why anatomy protects you

There is a persistent misconception that pulling on a cup will suck the IUD straight out. In reality, anatomy is well designed.

As shown in the diagram below, to remove an IUD, the doctor must pull on the strings along the axis of the cervix so that its "arms" fold. However, this axis is almost never aligned with the axis of the vagina (the uterus is often tilted forward or backward).

   

    The axis of the cervix is not aligned with the axis of the vagina (pink arrows)   

💡 The good news:
When you remove a menstrual cup, you pull along the axis of the vagina. Since this axis is different from that of the cervix, it is mechanically difficult to expel an IUD "by mistake" simply by pulling downwards. The angle between the cervix and the vagina acts as a natural protection.

3- What science says (The reference study)

For a long time, doubt lingered. But a major Canadian study settled the question.

4- The point of vigilance with ordinary cups

While anatomy helps, caution remains necessary. The main risk factor with an ordinary cup (equipped with a stem), is the uncontrolled suction effect.

If you pull on the stem by reflex (like a tampon) without pinching the base to let air in, you create a depression (suction). Even if the axis is not aligned, this unnecessary suction can pull on the IUD or cause discomfort.
The goal is to have a removal without any resistance.

5- Luneale safety: The Moonpad

La Cup Luneale was designed without a stem to force the right movement and secure IUD wearers.

To remove it, you must grip the Moonpad (the ergonomic bottom of the cup). This pinching action is the key to safety: it cancels the suction effect BEFORE La Cup begins to move down.
No stem = No temptation to pull = No dangerous suction effect.

6- The 3 Golden Rules and Compatibility Table

To experience your cycle peacefully with an IUD, follow this protocol:

• Rule 1: The Quarantine Zone (3 months).
  The risk of natural expulsion is highest during the 3 months following insertion. Wait until your IUD is well stabilized before using your cup again.
• Rule 2: Short Strings.
  Ask your healthcare professional to cut the IUD strings short enough so you don't pinch them by mistake.
• Rule 3: Cancel the vacuum.
  Always pinch the bottom of your cup to let air in before removing it.

Medical note: This advice does not replace the opinion of your healthcare professional. In case of abnormal pain or if you feel the IUD strings are longer than usual, consult them.