4 things you should know about your cervix before using a menstrual cup

cervix menstrualcup

Let’s get straight to the point. When you know the height of your cervix, life as a menstrual cup user gets a lot easier for these solid reasons:

  1. Choosing the right menstrual cup size will not be as overwhelming.
  2. You’ll also be a few steps ahead when you first use a menstrual cup.
  3. Starting to use your cup will be a lot easier.
  4. You’ll be able to do on point troubleshooting because you’ll know how high to insert your Ruby Cup for it to pop open correctly and avoid leaks.


When you start using a Ruby Cup, one of the best secondary effects is that you get to know your body better. The better you know your body, the easier it is to understand it and the more empowered you’ll feel. Understanding how your body works is an act of empowerment. And the successful use of a Ruby Cup and knowing your cervix go hand in hand.

A quick introduction on the cervix

Let’s get started with a quick 101 on the cervix and its functions:

Where is the cervix

Imagine the cervix as the “neck of the uterus”. It’s the part that connects the vaginal canal with the uterus. It can vary in length, usually between 2.5 – 3.8 cm, hence why it’s good for you to know where your cervix is. If you have a longer cervix, your vaginal canal will be shorter. And if you have a high cervix your vaginal canal will be longer.


What does it look like

You can imagine the cervix looking like a small doughnut. It is ca. 2-3 cm in diameter and through a tiny hole in the middle (hence the doughnut reference), is where your menstrual blood will flow out and sperm will go in. Depending on the phase of your menstrual cycle, your cervix will look different, and even shift position during your menstrual cycle due to hormonal fluctuations during the four phases of your menstrual cycle.

What is its function?

The team at Clue summed up the cervix’s function as the following:
“It keeps unwanted bacteria and viruses out of your uterus, it opens and closes to let sperm in and menstrual blood out, it produces its own lubrication and even grows its own plug if you become pregnant (called a mucus plug).”

What does your cervix have to do with your menstrual cup?

If you know the length of your cervix, you’ll know if you have a shorter or a longer vaginal canal. This will give you an orientation on which period cup size to choose to ensure that it will fit snugly and comfortable inside your vagina.

Menstrual cups come in different sizes for a reason. Ruby Cup, for instance, comes in two sizes, small and medium. As you read above, the length of the cervix can vary, which means that if you have a low cervix, your vaginal canal is shorter. Or if you have a high cervix, your vaginal canal is longer (and none is better or more beneficial than the other, just to clarify that.)

Depending on the length of your vaginal canal, some menstrual cups are more comfortable and will work better for your body than others. Now let’s find out how to measure your cervix.

cervix menstrual cup

How to measure the height of your cervix

Here’s a step-by-step feel-guide to finding your cervix from Clue:

1. Start at a time when your cervix is likely to be low and more easily reached (before or after menstruation is great).
2. Wash your hands very thoroughly, including underneath your fingernails.
3. Squat on the ground, or lift one leg up onto the toilet seat or side of the tub.
4. With your palm facing up, guide your longest finger carefully into your vagina (lube can come in handy here).
5. Feel for a round, raised circle with a dimple in the middle — it’s most likely to be at the top of the front vaginal wall (closer to your belly button than to your back).

To give you a better idea of how the different cervixes feel like, we asked Put A Cup In It if we could borough their fantastic illustrations.

This is what a high cervix feels like:

High Cervix
Image courtesy by Put A Cup In It.

Depending on the length of your fingers, this measurement method is an orientation, but it will definitely give you a good idea of your cervix height. If you can insert your longest finger almost all the way up, you have a high cervix.

What to look out for in a menstrual cup if you have a high cervix (long vaginal canal)
Look for a longer menstrual cup, it will be easier to grip and you won’t get the “It’s lost and I can’t get it out” scare.

This is what an average cervix feels like:

mesntrual cup cervix
Image courtesy by Put A Cup In It.

If you can insert your longest finger until the middle knuckle, then you have an average cervix.

What to look for in a menstrual cup if you have an average cervix (long vaginal canal)
Any menstrual cup should work for you, as long as it is not specifically designed for a high cervix and one where you can still trim the stem.

If you have an average cervix, focus more on specifications such as heaviness of your menstrual flow and strength of your pelvic floor muscles when choosing the right menstrual cup.

This is what a low cervix feels like:

cervix menstrual cup
Image courtesy by Put A Cup In It.

If you can insert your longest finger only until slightly above the middle knuckle, then you have a low cervix.

What to look for in a menstrual cup if you have a low cervix (short vaginal canal)
Look for a short menstrual cup that fits comfortably inside your vagina. This helps avoid the stem poking out, which can feel uncomfortable against your labia.

What to do if you have a menstrual cup that doesn’t match your cervix?

Maybe you bought a Ruby Cup without checking the height of your cervix first. Don’t worry, it’s quite possible it will still work out great for you, as our cups work well for beginners. But if you have been struggling with yours, then please check the potential problem situations below. They can help you understand why your period cup doesn’t seem to work for you and pose a solution that might change it all, without having to buy a new menstrual cup.

In any case, if you have a Ruby Cup that doesn’t fit, our Money Back Guarantee has your back.

You bought a menstrual cup for a heavy flow but have a low cervix (short vaginal canal)

Shorter cups often have less capacity because of their smaller size. So what to do if you chose a Ruby Cup medium because of your heavy flow, but didn’t know you had a low cervix? You might be experiencing these three things:

1. It’s possible that the entire length of the menstrual cup does not fit.

Why that’s a problem:
The menstrual cup might not fit and the stem could be poking you. A menstrual cup is correctly placed when it sits fully inside the vagina where you do not feel it. One of the big advantages of cups is that you don’t feel it. That’s why some cup-lovers say things like “It’s so comfy, I sometimes forget I’m even wearing it!”, which probably sound unimaginable if you’ve never tried one before.

How to solve that:
If you feel it, then you’d better adjust something, such as trimming the stem. You can carefully cut the stem of your menstrual cup with scissors without compromising its functionality. Please, do not cut the stem while wearing the Ruby Cup.

2. It’s possible it will suction too close to your cervix, causing cramps.

Why that’s a problem:
Cramps. That’s all we need to say. Another interesting low-cervix fact: have you ever felt pain during penetrative sex in a certain position, but not in another? It’s most likely because your cervix was being bumped too hard. But remember: our bodies are all individual universes, and what might be painful for some, can feel pleasurable to others. It’s just good to be able to explain that discomfort to yourself, instead of riddling about it and wondering if something is wrong with you.

How to solve that:
Again, first try trimming the stem to see if your cup then has more space in the vagina to be able to pop open and form the suction below the cervix, instead of on it.

If trimming doesn’t solve the issue, then it’s time for a shorter cup and our money back guarantee, where you can switch size during the first four months from your order.

3. It’s possible your menstrual cup will leak

Why that’s a problem:
Nobody wants to leak during their period. So when that happens with your menstrual cup (especially if everyone has been raving on about how awesome it is), then it’s really frustrating.

How to solve that:
One of the most common reasons for a menstrual cup to leak is if it’s inserted too high up. That enables a situation where the period cup opens up next to the cervix instead of under it, only catching half of the menstrual fluid, while the other can flow straight past your cup instead of into it. To solve that, make sure you insert your menstrual cup low enough for it to open up below the cervix.

menstrual cup cervix

You bought a menstrual cup for a light flow but have a high cervix (long vaginal canal)

If you chose a Ruby Cup small and have a very high cervix, chances are you got a bit of fright when you first tried to get it out. Maybe you even couldn’t reach it. Actually, if you’re in this situation right now, head straight over to our blog post with three immediate tips you can do if your menstrual cup is stuck inside your vagina.

Here are two of the most common things that occur:

1. Your menstrual cup will be difficult to reach

Why that’s a problem:
Getting your cup out, in the beginning, can be scary. Especially if it slid up high enough for you not to reach it anymore. No panic, it can’t get lost in your vagina, it’ll just take a bit of technique to get it out.

How to solve that:
Menstrual cup users have claimed the term “bearing down”. It’s basically squatting down, and pressing the cup down with your pelvic floor or stomach muscles until you can reach it. You might have to insert your middle finger and thumb into your vagina more than you thought, but that’s absolutely normal. Then reach for the stem and wiggle the cup a little bit down until you can reach the base, pinch it and pull it out.

2. Your Ruby Cup is never full

There’s not really a problem with that. Keep in mind that a Ruby Cup Small can hold about the same amount as 5 normal tampons.

Recap and wrapping it up

Ruby Cup is generally known as a beginner-friendly menstrual cup. It’s medical grade silicone is soft enough to make for a comfortable fit for average pelvic floor muscles and firm enough to pop open easily.

Ruby Cup Menstrual Cup Red

It’s available in two sizes, with great results for people with an average to low or average to high cervix. If your cervix is extremely high or extremely low, check out recommended cups for your anatomy.

Ruby Cup Medium
Total Length: 68 mm
Length without stem: 51 mm
Capacity: 24 ml

Recommended for average and high cervix with a heavy flow.

Ruby Cup Small
Total Length: 65 mm
Length without stem: 46 mm
Capacity: 19 ml

Recommended for a low cervix and light flow.
If you have a heavy flow and low cervix, check if the trimmed Ruby Cup Medium could be an option for you. Here’s our full Ruby Cup size choosing guide.

We hope this helped get you some insight into the relationship between your cervix and a successful menstrual cup life.

Let us know if you have any experience with this in the comments.

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Leanka Sayer

Leanka’s job is to talk about periods. She is currently the Content and Community Manager at Ruby Cup, an award-winning social business that sells menstrual cups, where for every Ruby Cup you buy, you automatically donate another one to a girl in need. She advocates for period positivity and having a healthy relationship with your menstrual cycle. Leanka studied Communication Science in Vienna and has been working for Ruby Cup since February 2014 - first in Berlin, now in Barcelona.