You switched to a menstrual cup for peace of mind — and now you find a stain? Don't panic. Leaking is not inevitable; it's simply a mechanical adjustment problem.
In 90% of cases, your Cup is not "too small" or "defective" — it's just incorrectly positioned or not fully open. Here is the quick troubleshooting guide to identify your issue and fix it right away.
Article Contents
1- Quick Diagnosis: Why Is It Leaking?
Find your situation in the table below to identify the immediate solution.
| Symptom / Timing | Likely Cause | Immediate Solution |
|---|---|---|
|
Immediate leak (Cup seems empty or barely filled) |
Positioning error: The Cup is placed too high or past the cervix. The flow is missing the cup entirely. | Slide the Cup down so it sits roughly one knuckle from the vaginal entrance. Check with a finger that the cervix is above the rim. |
|
Leak + discomfort (Immediate sensation of pressure) |
Cup still folded: The Cup has not fully opened. | Twist the base (the MoonPad) a quarter turn to make it pop open. |
| Leak + sensation of "air bubbles" | Blocked holes and overpressure: As the Cup fills, the air displaced by the blood cannot escape through the holes. Pressure builds up and the air eventually forces its way past the rim, pushing blood out with it. | Remove the Cup, fill it to the brim with water, place your palm flat over the rim to seal it, then squeeze the Cup to force water through the holes and clear any blockage. |
|
Leak after 2–3 hours (Overflows earlier than expected) |
Volume taken up by the cervix: The cervix dips too deeply into the cup. | Your cervix is occupying space meant for the flow. Action (counterintuitive): Try a smaller size. A narrower cup may prevent the cervix from sinking to the bottom (it will rest on the rim instead), leaving more room for blood. |
|
Leak on waking (Overnight) |
Loss of seal: Lying position + relaxed muscles. | Gravity is no longer helping, and the Cup may have shifted. Action: Make sure the suction seal is correct before sleeping. Empty the Cup without fail just before bed. |
|
Just a few drops (Brown or pinkish trace) |
Residual blood: This is not an internal leak. | There was blood already on the vaginal walls, below the Cup, from before insertion. Action: After inserting the Cup, run a clean finger around it to wipe the walls clean (the "windscreen wiper" technique). |
2- The "Spotting" Case (False Leak)
It's important to distinguish a true leak (continuous flow) from spotting (a few brown or pinkish traces).
Spotting often happens right after insertion. It is not the cup leaking — it is blood that had already travelled down the vaginal walls before
you inserted the cup.
The Luneale tip: After inserting your Cup, simply run a finger rinsed with cold water just inside the vaginal entrance
to remove this residual blood.
3- The Cervix Problem
This is the most common technical cause of "mysterious" leaks. Your cup is only half full, yet it's leaking. Why?
If you have a low cervix, it can settle inside the cup and act as a "plug" that takes up usable volume. The result: the Cup overflows much
sooner than expected.
If this happens regularly, try positioning the Cup lower (if your anatomy allows) or empty it more frequently on heavy flow days.
4- Why the Air Holes Matter
Look at the upper rim of your Cup Luneale. You will see small perforations. They are essential for releasing the suction seal on removal — but also for creating the seal when inserting.
If these holes are blocked by dried blood or clots, air cannot circulate and the Cup may leak.
Care tip: Every time you clean your Cup,
make sure these holes are clear by running water through them.
5- Key Takeaways
A correctly inserted Cup does not leak. If it does, the cause is mechanical:
- Check that it is fully open (run a finger all the way around).
- Check the suction seal (slight resistance when you pull).
- Check that the air holes are clean.
Still unsure about sizing or use? Our expert customer care team is here to guide you towards a worry-free CycleCare.
