How Deep Is the Cervix?

How deep is the cervix? As health advocates (but not doctors), we're asked this question all the time. Where is the cervix and how do I know if mine is low or high? The real answer to these questions is: It depends. We come in all different shapes and sizes inside and out. So to answer these questions, it's a good idea to do a little research and get to know your body better.

In this guide, we answer, how deep is the cervix and define what a "low cervix" is. Keep in mind that we are not doctors, so this is not medical advice. If you're struggling with pain or have health concerns, please contact your doctor. The following content was written for informational purposes only.

Cervix Definition

Don't know exactly what a cervix is? Don't sweat it. Until we invented the Casco Cup, we had no idea how deep the cervix is or what it's function is.

The cervix is the narrow passage between the uterus and the vagina. It has a cylindrical shape and is made up of muscle tissue.

  • Ectocervix: The part closest to the vagina that a gynecologist can see during an exam.
  • External Os: The small hole that connects the uterus with the vagina.
  • Endocervix: The narrow passage connecting the vagina with the uterus.
  • Internal Os: The part closest to the uterus.
  • Transformation Zone: Sometimes referred to as the TZ, this where the ectocervix and endocervix meet.

The cervix expands and contracts depending whether you have your period and during childbirth. When someone is aroused, their cervix also moves further up as the vagina lengthens. This is why many women can have sex without cervix pain, though this is also possible.

It also produces mucus -- especially during menstruation -- to increase the likelihood of pregnancy.

What Is the Cervix's Function?

It's a key part of the female reproductive system. More specifically, it allows for the passage of a baby during childbirth, and the release of menstrual fluid during a period. For conception to occur, the sperm must journey through the cervix to get to the uterus.

What is the cervix? Think of it as the barrier between the vagina and the uterus that keeps a woman's reproductive system safe. It's also a key body part to know about, especially when choosing a menstrual cup.

How Deep Is the Cervix?

For anyone debating between menstrual cup sizes, this is a great question to answer. When the average woman is unaroused, it's 3 to 4 inches deep. For someone who has a high cervix, it's 4 to 5 inches deep. For someone with a lower one, it's less than 3 inches deep.

Keep in mind that the vagina lengthens when aroused. This is why many women are able to have pain-free intercourse. Though experiencing pain during or after sex, also known as dyspareunia, is extremely common: Some research found that 60% of women experience it at some point.

Fun Fact: The cervix is where IUD strings are. If you're thinking of using a period cup and IUD simultaneously, ask a gynecologist to cut these strings short and let them know.

What Is a Low Cervix?

It's defined as one that's less than 3 inches deep. Think this is you? You may prefer the Casco Cup mini.

How to Measure It:

  1. Make sure you have trim nails.
  2. Wash your hands with a gentle and scent-free soap. Alternatively, you can measure your cervix in the shower.
  3. Insert the pointer finger into the vagina gently. You have a low cervix is you can reach it by the first knuckle. An average one can be reached by the second knuckle. If you can only reach it by the highest knuckle or can't reach it at all, yours is high.

Keep in mind that this is not medical advice. You can also ask a gynecologist their opinion.

Can Cervix Penetration Cause Pain?

For starters, the cervix cannot be "penetrated" during sex. There is no way for a penis or sex toy to pass through the External Os because it's just too narrow. However, people often use this term to refer to when a penis or sex toy touches the cervix.

Yes, if someone is not aroused enough, the vaginal may not lengthen and result in pain. However, some people find this pleasurable. This is called a cervical orgasm, which can occur with or without clitoral stimulation depending on the person according to research. It is also safe, but make sure to discuss it with your partner so no one is surprised or uncomfortable.

Speaking of the bedroom, here are some times for having awesome period sex.

Other Questions About Cervix Depth and Health

In addition to being a crucial part of the feminine reproductive system, the cervix is also the focal point for several illnesses and health complications. If you are experiencing pain or are worried about any of these conditions, please speak with your doctor.

What Is a Tilted Cervix/Uterus?

A tilted uterus is a medical condition that is exactly what it sounds like: The uterus is tipped backward, as can be other parts of the reproductive system like the cervix. It's also very common. Approximately 25% of women have a tilted uterus, according to research.

In most cases, it will not affect the ability to become pregnant. In fact, people will this condition most likely don't even know about it. A tilted uterus may cause cervical pain because the cervix sits at a different angle than is normal. If you are worried about this, it's best to speak with a medical professional.


  • Genetics
  • Scarring
  • Pregnancy
  • Weakened pelvic floor muscles
  • A medical condition


  • Painful intercourse
  • UTIs
  • Cramps
  • Pain wearing tampons or a menstrual cup
  • Incontinence

If you have any questions about a tilter uterus, please speak with your doctor.

What Are Kegels and Should I Be Doing Them?

Kegel exercises are designed to strengthen the pelvic floor. They essentially involve relaxing and contracting the pelvic floor muscles (think: those that stop the flow of urine when you're in the middle of going to the bathroom).

This may have many benefits to doing Kegels, especially for people struggling with incontinence. Most people who do them do so after childbirth, weight gain, or as they age. There are lots of medical guides online for doing Kegels, and it's best to speak with a doctor before beginning your practice.

What Causes Cervix Pain?

There are lots of things that can cause it besides penetration. Conditions that may affect the cervix include cancer, HPV, dysplasia, and inflammation. Keep in mind that many of these conditions do not cause pain in their early stages so a trip to the gynecologist and a Pap smear are essential.

Answering, How Deep Is the Cervix?

One of the amazing things about menstrual cups is how they teach us about our bodies. The cervix is usually only thought of when concerned about illness and pain. But it's actually an important part of the reproductive system with the amazing ability to expand, contract, deliver children and protect the uterus day-to-day.

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