How to Choose Between a Menstrual Cup and Disc Based on Your Anatomy

Deciding between a menstrual cup and a disc often comes down to more than just preference—it’s about how your unique anatomy interacts with each product. While both are reusable, eco-friendly alternatives to tampons and pads, they sit differently in the body and work best for different shapes and cervix heights. Understanding your anatomy is the first step to a comfortable, leak-free period.

In this guide, we’ll break down the key anatomical factors—cervix height, vaginal canal length, and pelvic floor tone—and explain how they influence whether a cup or disc will work better for you. By the end, you’ll have a clear idea of which product to try first, and how to adjust if your anatomy changes over time.

Why Anatomy Matters in Period Product Choice

Your cervix is the lower part of the uterus that extends into the vaginal canal. Its height varies from person to person and can even change throughout your cycle. Menstrual cups create a seal around the cervix, while discs tuck behind the pubic bone and rest in the vaginal fornix. This fundamental difference means that your cervix height and vaginal shape directly affect fit and comfort.

If a cup is too long for your vaginal canal, it may press against your cervix or protrude, causing discomfort. If a disc is too small, it may not stay in place. Knowing your anatomy helps you choose the right size and type, preventing leaks and making your period easier to manage.

• Check your cervix height by inserting a clean finger and feeling for a firm, round bump—this is your cervix. If it’s within reach of your first knuckle, you have a low cervix; if you can only reach it with a longer finger, you have a high cervix.

Cervix Height: The #1 Factor

Cervix height is the most critical factor in choosing between a cup and a disc. A low cervix (less than 2 inches from the vaginal opening) often makes cups tricky because the cup’s stem and body may not fit without being trimmed. In contrast, discs are designed to sit lower in the vaginal canal and are often more comfortable for low cervixes, as they don’t rely on suction and can be tucked behind the pubic bone without pressing on the cervix.

For a high cervix (more than 2.5 inches), a longer cup like the Saalt Cup in size large can work well, as it can sit higher and create a secure seal. Discs also work for high cervixes, but you may need a larger disc to reach the fornix. The key is to measure your cervix height during your period, as it can shift slightly.

• If you have a low cervix, consider starting with a disc or a shorter cup like the Saalt Cup in size small.

Vaginal Canal Shape and Tone

The shape of your vaginal canal—whether it’s more straight or curved—can affect how a cup or disc sits. Cups are flexible and can conform to some curves, but a very curved canal may make insertion and removal more challenging. Discs, being more flexible and having a shallower profile, can navigate curves more easily.

Pelvic floor tone also matters. If you have strong pelvic floor muscles, a cup’s suction may be more secure, but it can also make removal harder if the cup is too firm. Discs rely on the pubic bone for placement, so they may be easier for those with stronger muscles. Both products come in different firmness levels; the Saalt Cup is known for its soft yet durable silicone, which balances comfort and security.

• If you experience discomfort with tampons due to vaginal dryness or sensitivity, a disc may be more comfortable because it doesn’t create suction.

Comparing Cups and Discs: A Quick Anatomy-Based Chart

To help you decide, we’ve summarized the key differences in a simple table. Remember, this is a general guide; your personal comfort is the ultimate test.

How to Test Your Anatomy at Home

You don’t need a doctor to determine your cervix height. Wash your hands and insert a clean finger into your vagina. Feel for your cervix—it may feel like the tip of your nose. Note how far your finger goes before you touch it. If it’s less than 2 inches, you have a low cervix; 2-3 inches is average; more than 3 inches is high.

You can also check for any sensitivity or discomfort when pressing on the vaginal walls. This can help you decide if you prefer the gentle pressure of a disc or the suction of a cup. Once you know your anatomy, you can choose a product with confidence.

• Perform this test during your period, as the cervix may be lower or higher at different times.

Product Recommendations Based on Anatomy

For those with a low cervix, a disc like the Saalt Disc (if available) is often the best choice, as it sits lower and doesn’t require a long stem. For a high cervix, the Saalt Cup in size large can provide a secure fit. If you’re unsure, many people find that trying both is the best way to learn what works for their body.

Saalt offers a range of products designed with different anatomies in mind. The Saalt Cup comes in two sizes, and the brand also offers leakproof underwear as backup, which can be especially helpful when you’re still figuring out the right fit. Remember, it’s normal to need a few cycles to get used to any new product.

• If you’re between sizes, consider sizing up for a heavier flow and down for a lighter flow, regardless of anatomy.

Choosing between a menstrual cup and disc is a personal decision that depends largely on your anatomy. By understanding your cervix height and vaginal shape, you can narrow down your options and pick a product that will keep you comfortable and confident. Start with a product that matches your anatomy, and don’t be afraid to experiment—your body is unique, and finding the perfect fit is worth the effort.