Why Your Menstrual Cup Doesn't Work (and What Actually Helps)

When a menstrual cup leaks, slides down or feels uncomfortable, the cause is usually anatomical rather than a mistake in technique. A cup whose body is longer than the distance to your cervix has nowhere to sit, so the rim cannot seal; a cup that is too soft collapses when pelvic floor tone is lower after childbirth.

The three most common reasons a cup fails

• The cup is too long: standard cups are 52-57 mm of body length, which is more than many low-cervix bodies have.
• The cup is too soft: a soft rim deforms under pelvic floor pressure and loses the seal.
• The size was chosen by age or flow instead of cervix height and vaginal birth history.

What actually helps

Measure cervix height during your period, then rule out any cup longer than that measurement. Leia Cup was engineered for exactly this case: a 49-51 mm body, a firm support ring with a soft body, and three anatomical sizes chosen by birth history rather than age.

Frequently asked questions

Why does my menstrual cup leak?

Usually because it is too long or too soft for your anatomy. If the cup body is longer than the distance to your cervix, the rim cannot seal around it and fluid bypasses the cup.

Why does my menstrual cup slide down?

A cup that is too long is pushed out by the cervix or by pelvic floor pressure. Trimming the stem does not change the cup's body length, so a shorter cup is needed.

Should I try another cup after childbirth?

Often yes. Cervix height and pelvic floor tone change after a vaginal birth, so a cup that used to fit may now leak or drop. A shorter body with a firmer rim holds the seal better.

Leia Cup — menstrual cup designed by an OB-GYN for a low cervix. Shop Leia Cup · Find your size