Menstrual Cup Leaking? 9 Reasons and Simple Fixes

Menstrual cup leaking can happen for several reasons, including incomplete opening, a poor fit, positioning, or a full cup. Many leaks can be reduced with small changes in fold, position, or emptying time.

Some beginners experience leaks while learning to use a menstrual cup, and it doesn't necessarily mean you're doing something wrong. Below are 9 common causes of a leaking menstrual cup and a simple fix to try for each one.

Why Is My Menstrual Cup Leaking?

•      

          The cup hasn't fully unfolded inside you

•     The cup's position or fit isn't right

•       The size or shape may not suit you

•       The cup is full

•       The air holes under the rim may be blocked

•       The cup is old or has lost its shape

Read on for things to try for each of these.

First, Check: Is It Really Leaking?

Before changing anything, take a minute to check what is actually happening.

•       A few drops or light spotting when you remove the cup can be normal, especially on heavy days.

•       Continuous leaking soon after insertion may mean the cup hasn't opened fully or isn't sitting right.

•       Stains on your underwear only after many hours often means the cup is full and needs emptying earlier.

If the leaking is constant, work through the reasons below one by one.

9 Reasons Your Menstrual Cup Is Leaking (and How to Fix Each One)

1. The Cup Hasn't Fully Opened

Why it happens: A cup is folded to go in. If it stays partly folded, flow may slip past the rim.

How to fix it: After insertion, check that the cup has opened fully and sits comfortably. If it feels folded or uncomfortable, or if it leaks, remove it and reinsert it following the manufacturer's instructions.

2. The Cup Isn't Sitting Comfortably

Why it happens: A cup works by sitting comfortably against the vaginal walls. If it doesn't open fully or sit right, flow may escape.

How to fix it: Remove the cup and reinsert it following the manufacturer's instructions, making sure it opens fully. If leaks continue, try a different fold or a different fit.

3. The Fold Doesn't Suit Your Body

Why it happens: Different folds open differently. A fold that works for one person may not open fully for another.

How to fix it: Try a different fold recommended in your cup's instructions, such as the C-fold or punch-down fold. Technique may improve with practice.

4. The Cup Is the Wrong Size

Why it happens: An unsuitable cup size or shape may contribute to leaks.

How to fix it: Follow the brand's sizing guidance, and consider capacity, firmness, cervix height, flow, and personal comfort when choosing a size. TIME Menstrual Cups come in three sizes (S, M, L), and the TIME Menstrual Cup page has details to help you choose. If leaks continue, consider trying a different fit. If you're still unsure, our guide on why more women are switching to menstrual cups explains how to choose.

5. The Cup Is Already Full

Why it happens: On heavy days, a cup can fill sooner than you expect.

How to fix it: Empty it more often on heavier days and always follow the maximum wear time in your cup's instructions for use. With time you may get a better sense of how quickly yours fills.

6. The Air Holes May Be Blocked

Why it happens: Many cups have small air holes just below the rim. If they get blocked, it may affect how the cup opens.

How to fix it: Clean the holes according to the manufacturer's care instructions. Avoid sharp objects that could damage silicone.

7. The Cup's Position Needs Adjusting

Why it happens: The cup's position and fit can affect comfort and leakage, and everyone's anatomy is different.

How to fix it: Follow the instructions for your cup and adjust its position if it doesn't sit comfortably. If the stem bothers you, check your cup's instructions before trimming it.

8. Insertion Feels Difficult

Why it happens: Nervousness or muscle tension can make insertion feel more difficult.

How to fix it: If insertion feels difficult, pause, relax, and try a comfortable position. Never force the cup in. If needed, use a small amount of water-based lubricant if your cup's instructions permit it.

9. The Cup Is Old or Damaged

Why it happens: Over time, cups can lose their shape, become sticky, or discolor.

How to fix it: Check for tears, a loose rim, stickiness, or a changed shape. If you see any of these, it's time for a new one. Our guide on signs you need a new menstrual cup lists 7 clues it's time to replace yours.

How to Check Your Menstrual Cup Fit (Step by Step)

1.     

      1.      Wash your hands with soap and water.

2.      Fold the cup and insert it following the manufacturer's instructions.

3.      Let it open. You may feel or hear it settle.

4.      Check that the cup has opened fully and sits comfortably.

5.      If it feels folded, feels uncomfortable, or starts to leak, remove it and reinsert it following the manufacturer's instructions.

6.      Never force the cup in or pull it on sharply.

Menstrual Cup Leaking on Heavy Flow Days

Heavy days may fill the cup faster. To help reduce leaks:

•       Empty the cup more often on your first two heavy days.

•       Make sure you're using the right size for your flow.

•       Use a thin pantyliner as backup for a cycle or two while you learn.

If your bleeding seems unusually heavy, read When Is Heavy Bleeding Too Heavy? and our guide on managing heavy periods.

Menstrual Cup Leaking at Night or During Exercise

At night: Empty your cup right before bed and again as soon as you wake up. Follow the maximum wear time given in your cup's instructions for use, and don't exceed it overnight. If you also want tips for comfortable nights, see How to Sleep Better During Your Period.

During exercise: Check that the cup sits comfortably before you start, and that the stem isn't causing discomfort. For more, see our period-friendly workout guide.

Common Beginner Mistakes That Cause Leaks

Many leaks come from small habits, like choosing the wrong size, not checking that the cup has opened, or not emptying early enough. We've covered these in detail in 7 Common Menstrual Cup Mistakes Beginners Make (and Simple Fixes).

When to Switch Your Cup or Try a Different Size

It may take a few cycles to become comfortable with insertion and positioning. Persistent leaks may need a different fit or advice from a healthcare professional. If leaks continue, you can:

•       Try a different size

•       Try a different fold

•       Look at the cup's design

Design matters. The TIME Menstrual Cup is made of medical-grade silicone and is designed with an Adaptive Seal Rim, Secure Grip, an Ergo-Tulip shape, and an Air-Relief Rim, which are intended to support a comfortable fit. You can see all the details on the TIME Menstrual Cup page.

Not sure whether a cup is right for you at all? Compare your options in Menstrual Cup vs Pads vs Tampons.

When to See a doctor

Remove the menstrual cup if it causes ongoing pain or discomfort. Speak to a healthcare professional if you notice unusual discharge, a strong or unusual smell, or bleeding that is much heavier than normal.

Seek urgent medical attention if you develop a sudden fever, rash, vomiting, severe dizziness, or feel faint while using a menstrual cup. These symptoms can indicate a serious condition and should not be ignored.

A menstrual cup should not cause persistent pain. If you cannot insert or remove it comfortably, stop and seek professional advice rather than forcing it.

This article provides general information and does not replace advice from a qualified healthcare professional.

Frequently Asked Questions

Why is my menstrual cup leaking even when it's not full?

Common reasons include the cup not opening fully, its position or fit, or a different fold being needed. Remove and reinsert it following the manufacturer's instructions, or try a different fold.

How do I know if my menstrual cup has opened properly?

Check that it feels comfortable and has opened fully. If it feels folded or leaked, remove it and reinsert it following the manufacturer's instructions.

Can the wrong size cause leaking?

It may. An unsuitable size or shape may contribute to leaks. Follow the brand's sizing guidance and consider a different fit if leaks continue.

How often should I empty my cup on heavy days?

Check and empty it more often on heavier days and never exceed the maximum wear time in your cup's instructions for use.

Is it normal for a menstrual cup to leak at first?

It can happen. It may take a few cycles to become comfortable with insertion and positioning.

Should I use a pad as backup while I'm learning?

Yes, a thin pantyliner or pad is a good safety net for the first few cycles.

Can I share my menstrual cup with someone else?

No, cups are personal hygiene products. Read more in Can I Share My Menstrual Cup?

When should I replace my menstrual cup?

Replace it if it's damaged, sticky, discolored, or has lost its shape, or when your brand's guidance says so.

Final Thoughts

Leaks can result from fit, positioning, incomplete opening, or a cup that needs emptying. Check that the cup has opened fully, try a different fold, review the size guidance, and empty it on time. If leaks persist, consider a different fit or speak to a healthcare professional.

Looking for a menstrual cup to try? Explore the TIME Menstrual Cup (S, M, L), and read our story on how the menstrual cup came to be if you're curious about its history.