Wearing a menstrual cup comes down to three things: folding it small enough to insert, positioning it just below your cervix, and confirming it has opened fully to create a leak-proof seal. The learning curve is real, and most people need two or three cycles to feel confident. Here’s everything you need to get it right.
Find Your Cervix Height First
Before you even open the box, it helps to know where your cervix sits. This determines which cup size and length will work for you. With clean hands, insert one finger into your vagina and feel for a firm, round bump, similar to the tip of your nose. Note how far your finger goes in before you reach it. If you can barely insert a finger before touching it, you have a low cervix and need a shorter cup. If your finger goes all the way in and you can just barely reach it, or can’t reach it at all, you have a high cervix and should opt for a longer cup that’s easier to grab during removal.
Cervix height can shift slightly throughout your cycle, so check during your period for the most accurate read. Many people find their cervix sits lower during menstruation than at other points in the month.
Choosing a Fold for Insertion
You need to fold the cup to make it narrow enough to insert comfortably. There are several options, and the best one depends on your experience level and what your body responds to.
The punch-down fold is the best starting point for beginners. You push one side of the rim down into the base of the cup with your finger, creating a narrow, tapered tip. This fold gives you a natural “handle” to grip, and it stays folded well during insertion. The C-fold (pressing the cup flat and folding it in half) is the simplest to perform and what most experienced users switch to eventually. The trade-off is a wider insertion point, and it tends to pop open prematurely before you’ve positioned it, which can be frustrating when you’re still learning.
If your cup won’t open once it’s inside, try the 7-fold. You press the cup flat, then fold one corner of the rim diagonally down toward the base. This fold creates more spring tension, which helps the cup pop open. For people who struggle with insertion due to the cup’s width, the labia fold produces the smallest overall diameter of any fold, though it takes practice to get right and works best with softer, thinner cups.
How to Insert the Cup
Get into a comfortable position. Squatting, sitting on the toilet, or standing with one foot on the edge of the tub all work. Relax your pelvic muscles, because tensing up makes the vaginal canal narrower and insertion harder. Wetting the cup with water or applying a small amount of water-based lubricant to the rim can help it glide in.
Hold the folded cup with the opening facing up and guide it in at a slight angle toward your tailbone, not straight up. This follows the natural angle of the vaginal canal. Push it in until the entire cup, including the stem, is inside. A menstrual cup should sit lower than a tampon, right below the cervix. Placing it too high pushes it into the wider upper portion of the vagina (the fornix), where it can’t form a proper seal and will shift around and leak.
If the stem pokes out or feels uncomfortable, you can trim it with scissors. Some people trim it completely; others leave a small nub for grip during removal.
Confirming the Seal
This step is the difference between a leak-free day and stained underwear. Once the cup is in, run a clean finger around the rim to check that it has fully opened. You should feel a smooth, round circle with no dents or creases. Then run your finger around the base to confirm it’s expanded there too. Give the cup a gentle twist or wiggle. It should feel like it’s sitting snugly, and you may hear or feel a slight pop as it unfolds and seals against the vaginal walls.
If the cup feels dented or collapsed on one side, try rotating it, or remove it and reinsert with a different fold. The 7-fold and S-fold both have more spring tension that can help a stubborn cup open fully.
How Long You Can Wear It
Most menstrual cups can stay in for up to 12 hours before you need to empty and rinse them. On heavier days, you may need to empty it more often. On light days, the full 12 hours is fine. You can sleep with a cup in, exercise, swim, and go about your day without removing it.
A lab study published in Applied and Environmental Microbiology found that menstrual cups are not inherently safer than tampons when it comes to toxic shock syndrome (TSS). The air introduced into the vagina along with the cup can promote bacterial growth, and the effect was more pronounced with larger cups. The risk remains very low overall, but the same precautions apply as with tampons: empty within the recommended window and wash your hands before handling the cup. Using a smaller cup when your flow allows it may further reduce risk.
How to Remove the Cup
Bear down slightly with your pelvic muscles to push the cup lower, then reach in and pinch the base of the cup (not the stem) to break the suction seal. This is the most important part. Pulling the cup out by the stem alone without breaking the seal first creates a vacuum that can cause real discomfort. Pinch, then gently rock the cup side to side as you ease it out.
If you can’t reach the base, slide a finger alongside the cup and press it gently against the vaginal wall. This lets air in and releases the suction. Then hook your finger over the rim and slide the cup out. Keeping your muscles relaxed and breathing steadily makes the whole process easier. Tensing up pushes the cup higher and makes it harder to reach.
Cleaning Between Uses
During your period, rinse the cup with cold water first to prevent staining, then wash it with warm water and a mild, unscented soap. Avoid antibacterial soap, oil-based soap, scented soap, baking soda, bleach, hydrogen peroxide, rubbing alcohol, and vinegar. These can degrade the silicone or leave residues that irritate vaginal tissue.
At the end of your cycle, sterilize the cup by placing it in a rolling boil for no more than 10 minutes. Some brands sell microwave-safe sterilizing containers that you fill with water and heat for three to four minutes. Store the cup in a breathable cloth bag rather than an airtight container, which can trap moisture and encourage bacterial growth. Researchers have recommended keeping a second cup on hand so you can boil one while using the other, ensuring each cup is fully sterilized between wears.
Troubleshooting Leaks
Leaks almost always trace back to one of three problems: the cup didn’t fully open, it’s sitting in the wrong spot, or it’s overflowing. Start by running your finger around the rim after every insertion to confirm the cup is fully expanded. If you feel a fold or dent, rotate the cup or gently push against the vaginal wall next to the dent to give it room to pop open.
Positioning matters just as much. If the cup is sitting beside or above your cervix instead of directly below it, menstrual fluid flows around the cup rather than into it. This is surprisingly common. After insertion, wiggle the cup gently and let it settle. It should feel like it’s sitting snugly around the cervix, not floating loosely. If you consistently leak despite a good seal, try a different size or shape. A cup that’s too narrow for your anatomy won’t seal properly, and one that’s too short may sit too low to catch anything.
On your heaviest days, even a well-placed cup can overflow if you go the full 12 hours. Pay attention to your flow pattern during the first couple of cycles and empty more frequently on peak days. Wearing a thin panty liner as backup while you’re still learning the timing is practical, not a sign of failure.