The Short Answer
Menstrual discs are safer than menstrual cups if you have an IUD. While both products are made from body-safe materials and carry near-zero risk of Toxic Shock Syndrome (TSS), their functional mechanics are very different.
Cups use a firm seal and suction to stay in your vaginal canal. This suction can actually pull your IUD strings and dislodge your birth control. Discs sit completely suction-free behind your pubic bone, eliminating this risk entirely.
Why This Matters
Toxic Shock Syndrome has terrified women for decades, but TSS is a bacteria problem, not a bleeding problem. Tampons absorb blood and create a breeding ground for Staphylococcus aureus. Because cups and discs only collect blood in non-porous silicone, they are fundamentally safer than traditional tampons. Is Tss Still A Concern
However, the real danger with internal reusables is IUD expulsion. A 2020 clinical trial had to alter its safety protocols mid-study because an alarming number of women using menstrual cups were pulling out their copper IUDs. By the end of the year, 14% of cup users had expelled their IUD, compared to just 5% of non-users.
Menstrual discs solve this mechanical flaw. Discs sit in the vaginal fornix and use zero suction. They tuck neatly behind the pubic bone, making them the safest internal option for anyone with an intrauterine device. Are Menstrual Discs Safe
Discs also require less handling, which reduces the introduction of outside bacteria. A high-capacity disc holds up to 70ml of fluid. That's the equivalent of four super tampons, meaning you only need to touch it every 12 hours. How Long Wear Menstrual Cup
What's Actually In Menstrual Discs and Cups
Unlike tampons and pads, high-quality cups and discs do not hide proprietary chemical blends. They are incredibly simple products. Are There Chemicals In Pads
- Medical-Grade Silicone ā The gold standard for reusable products. It is non-porous, hypoallergenic, and does not harbor bacteria or disrupt vaginal pH. Is Silicone Menstrual Cup Safe
- Thermoplastic Elastomer (TPE) ā A medical-grade plastic alternative used in some cups and disposable discs. It is flexible and warms to your body temperature.
- Zero Dioxins or Bleach ā Because there is no cotton or rayon to process, there is zero risk of the bleaching byproducts found in conventional tampons. Is There Dioxin In Tampons
What to Look For
Green Flags:
- 100% Medical-Grade Silicone ā This material can be boiled repeatedly without degrading or leaching microplastics.
- Suction-Free Design ā If you have an IUD, a disc's rim-based placement is non-negotiable for safety.
- High Capacity ā Look for discs that hold 50ml+, allowing you to safely wear them for the full 12-hour maximum.
Red Flags:
- Concurrent Cup and IUD Use ā If you use a cup, you must meticulously break the vacuum seal before pulling. One slip can dislodge your birth control.
- White-labeled Amazon knockoffs ā Cheap imported silicone can contain fillers that irritate delicate vaginal tissue.
- Disposable Discs ā While safe for your body, disposable plastic discs create massive landfill waste. Reusable Vs Disposable Disc
The Best Options
If you are choosing between a cup and a disc, we strongly recommend a reusable silicone disc. Here are the best options currently on the market. Best Menstrual Disc
| Brand | Product | Verdict | Why |
|---|---|---|---|
| Nixit | Menstrual Disc | ā | 100% silicone, high capacity, completely suction-free. |
| Flex | Reusable Disc | ā | Patented notch makes removal easy without any vacuum effect. |
| Saalt | Menstrual Cup | ā ļø | Excellent clean materials, but caution required if you have an IUD. |
The Bottom Line
1. Switch to a disc if you have an IUD. The clinical data shows cups significantly increase the risk of dislodging your birth control.
2. Boil between cycles. Medical-grade silicone is incredibly safe, but you must sanitize it in boiling water between periods to prevent biofilm buildup.
3. Always wash your hands. The biggest infection risk with any reusable product is the bacteria on your fingers during insertion and removal.
FAQ
Can menstrual discs cause TSS?
There are zero documented cases of TSS from menstrual discs. Because they are made of non-absorbent silicone, they do not create the oxygen-rich, dry environment that breeds TSS bacteria like tampons do. Can Menstrual Cups Cause Tss
Is it safe to have sex with a menstrual disc?
Yes, it is completely safe. Because a disc sits in the wide vaginal fornix at the base of the cervix, it leaves the vaginal canal clear for penetrative sex without discomfort or safety risks.
Can menstrual cups cause pelvic organ prolapse?
There is no clinical evidence that cups cause prolapse. However, aggressively yanking a suctioned cup without breaking the seal first puts unnecessary strain on your pelvic floor over time. Menstrual Cup Vs Tampon