Is your menstrual cup leaking?
Before questioning your body — or the product — let’s pause.
Menstrual cup leakage is common, especially during the first cycles of use. Studies on menstrual cup adoption show that a learning period is normal before achieving comfortable and reliable use (van Eijk et al., The Lancet Public Health, 2019).
In other words:
If your cup is leaking, it is neither a failure nor an abnormality.
It is an adjustment in progress.
Understanding why a menstrual cup leaks helps prevent the most common mistakes — and can transform your menstrual experience.
1. It’s Not Fully Open
Why this causes leakage
A cup that hasn’t fully opened cannot create the suction seal necessary for leak protection.
Menstrual flow may then bypass the cup instead of being collected.
How to prevent it
-
Run a finger around the rim to check full deployment.
-
Gently rotate the cup after insertion.
-
Try different folding techniques.
Clinical data indicate that complete opening is a key factor in menstrual cup effectiveness (North & Oldham, Obstetrics and Gynecology Clinics, 2011).
2. Your Cervix Is Not Positioned Inside the Cup
Many people are unaware that the cervix can be tilted or slightly off-center.
Why this causes leakage
If the cervix sits beside the cup rather than inside it, menstrual flow may leak outside the cup.
How to correct it
-
Identify the height and position of your cervix at the beginning of your cycle.
-
Adjust the cup’s orientation accordingly.
Gynecological guidelines note that cervical position varies throughout the menstrual cycle (Hillard, ACOG, 2014).
Understanding this variation significantly reduces leakage issues.
3. The Size Is Not Adapted
A persistent misconception exists:
Heavy flow = larger size.
This is not necessarily true.
The real determining factors:
-
Cervical height
-
Pelvic floor tone
-
Obstetric history
-
Personal comfort
A cup that is too large may not position correctly.
A cup that is too small may shift.
Research shows that proper anatomical fit improves satisfaction and reduces leakage (van Eijk et al., 2019).
4. The Firmness Does Not Match Your Pelvic Tone
A cup that is too soft may be compressed by a strong pelvic floor.
A cup that is too firm may create uncomfortable pressure.
Pelvic pressure perception is documented in clinical guidance related to internal menstrual devices (Mayo Clinic News Network, 2016).
Firmness directly affects stability.
5. The Air Holes Are Blocked
The small holes located beneath the rim help create a controlled suction seal.
The issue
If they are clogged, the seal may be compromised.
The solution
-
Thorough rinsing
-
Regular inspection
-
Sterilization between cycles
Proper maintenance is recommended by the Cleveland Clinic (2025) to ensure safety and effectiveness.
6. The Cup Is Inserted Too High or Too Low
Unlike tampons, a menstrual cup typically sits lower in the vaginal canal.
Incorrect height may prevent proper opening or stable positioning.
Every anatomy is unique.
There is no universal placement.
7. It’s Simply Full
Although menstrual cups have a higher capacity than tampons, they still have limits.
Medical guidance suggests wearing a cup for a maximum of 8 to 12 hours depending on flow intensity (Cleveland Clinic, 2025).
The first two days of the cycle may require more frequent emptying.
Why Is My Cup Leaking? The Real Answer
A leaking menstrual cup is rarely a quality issue.
It is often related to:
-
Opening
-
Cervical position
-
Size
-
Firmness
-
Anatomical understanding
Research on menstrual health literacy shows that improved body awareness increases adoption and satisfaction with reusable menstrual products (PMC, 2024).
A leak becomes information — not a failure.
The Feminea Perspective
At Feminea, we refuse to normalize discomfort.
Your body is not defective.
It is specific.
An intimate protection product is not something to endure.
It is a tool to adjust.
Understanding your menstrual morphology is how you reclaim control.
Sources
van Eijk AM et al. (2019). Menstrual cup use, leakage, acceptability, safety: a systematic review and meta-analysis. The Lancet Public Health.
North BB, Oldham MJ. (2011). Preclinical, clinical, and over-the-counter postmarketing experience with a new vaginal cup. Obstetrics & Gynecology Clinics.
Hillard PJA. (2014). Menstruation in Girls and Adolescents. ACOG.
Cleveland Clinic. (2025). Everything You Need to Know About Menstrual Cups.
Mayo Clinic News Network. (2016). Menstrual cups vs tampons: Things you might not know.
PMC (2024). Systematic Review on Menstrual Health Literacy.
