By Aleksandra Oklińska, CEO of Lunette · Last updated 14 November 2026
Yes, you can poop with a menstrual cup in, and you can pee with one too. The cup sits in your vagina, a separate opening from your urethra and your anus, so you don't need to take it out. The one catch: bearing down can push the cup lower, so check it before you get up.
It's one of the most searched cup questions there is. In Google's search data for Lunette's own site, "can you poop with a menstrual cup in" and its variations show up thousands of times, usually from people who have just bought a cup, or are about to, and are quietly picturing the worst. Here's what actually happens, and how to stop the one thing that can go wrong.
Why doesn't a cup block anything?
There are three openings, front to back: the urethra, which carries pee from your bladder; the vagina, where the cup sits; and the anus. A menstrual cup sits low inside the vaginal canal, below the cervix, and stays put thanks to the vaginal walls and a light seal. Pee and poop leave by their own routes, so the cup isn't in the way of either.
That's why Lunette's instructions say there is no need to remove your cup when you pee. It also explains why a cup feels different from a tampon on the toilet: there's no string to keep clean or hold out of the way. If you're still deciding whether a cup is for you, start with what a menstrual cup is and how it works.
Will my menstrual cup come out when I poop?
It almost never falls out completely, but it can slide down. People search for exactly this, "will my menstrual cup come out when I poop", and the honest answer is that it depends on where the cup was sitting to begin with.
Pushing during a bowel movement uses your pelvic floor and abdominal muscles. Those same muscles press on the cup.
In fact, Lunette's removal instructions ask you to use that pressure on purpose: bear down gently, the way you would on the toilet, and the cup moves within reach. So a cup that slides during a poop is behaving the way it's supposed to during removal. It's just doing it at the wrong time.
It's more likely to happen if:
- the cup is inserted low, close to the entrance;
- it hasn't fully opened, so the seal is weak;
- you're constipated and straining hard;
- you have strong pelvic floor muscles, which is one reason Lunette suggests the softer Size 1 for people who do.
How do you poop with a cup in?
For most people, the routine is simple:
- Go normally. Don't hold it in. Constipation makes things worse for the cup, not better.
- Support the cup if you feel it move. On days you're straining, some people rest a clean finger lightly against the base of the cup. It's optional.
- Check before you stand up. Wash your hands, then feel for the base. If it has slipped, push it gently back into place and run a finger around it to check it's round.
- Wipe front to back. That keeps bacteria away from the vagina. Wash your hands again before handling the cup.
Prefer to take it out first? That works too. Lots of people empty their cup during a bathroom trip they'd make anyway, typically first thing in the morning, and reinsert it afterwards. With up to 12 hours of wear, that one morning visit often covers half the day.
Why does my cup make me feel like I have to poop?
"Is it supposed to feel like I have to poop?" is a question that comes up constantly in cup communities online. Researchers have now put numbers on it. A 2026 survey of 1,221 healthy cup users, published in Sexual & Reproductive Healthcare, found that 14.6% noticed a difference in how bowel emptying felt while wearing a cup, versus 6.2% without one. For peeing, it was 26.0% versus 9.0%.
The authors stress that these are self-reported sensations in women without pelvic floor problems, and that they likely reflect the situation rather than any underlying dysfunction. In other words: noticing your cup isn't the same as something being wrong.
Still, a cup shouldn't feel like constant pressure. If it does after the first few hours:
- Reposition it. Insert it angled towards your lower back, not straight up, and rotate it gently once it's in.
- Try a softer cup. Lunette Size 2 is made of firmer silicone. If you feel pressure on your bowel or bladder, Size 1 is softer.
- Trim the stem. Lunette says you may trim the stem with scissors if its length is uncomfortable.
Can pooping make a menstrual cup leak?
Peeing won't. A bowel movement can, but only if the cup moves and its seal breaks. The leak often shows up hours later, which is why people blame the cup rather than the bathroom visit. The fix is the quick check after you go.
Leaks are also part of learning. A 2019 systematic review in The Lancet Public Health, which pooled 43 studies with 3,319 participants, found that getting used to a cup took several cycles in every qualitative study it looked at, and that once people had the hang of it, leakage was similar to or lower than with pads or tampons. If your cup leaks when it isn't full, start with why your menstrual cup might be leaking.
Which Lunette size is easier on the toilet?
| Size 1 | Size 2 | |
|---|---|---|
| Best for | Light to medium flow, a low cervix, teens, strong pelvic floor muscles or a sensitive bladder | Medium to heavy flow or a higher cervix |
| Capacity | 25 ml (0.85 fl oz) | 30 ml (1.0 fl oz) |
| Diameter | 41 mm (1.6 in) | 46 mm (1.8 in) |
| Silicone | Softer | Firmer |
If bathroom trips are where your cup gives you trouble, whether it's pressure, sliding or a feeling that you need to go, the softer, narrower Size 1 is usually the better fit. If your flow is heavy and you've had no pressure problems, Size 2 holds more. The menstrual cup size guide goes through flow and cervix height.
What if you drop your cup in the toilet?
It's a rite of passage for some cup users. If it lands in clean water, retrieve it, wash it thoroughly with soap and warm water, and boil it for 5 minutes before reinserting. To make it less likely, empty the cup while sitting well back on the seat, low over the bowl, holding the base rather than the stem. Lunette's full routine for washing and boiling is in how to clean a menstrual cup.
What about public restrooms?
The FDA lists one real downside of cups on its menstrual cup page: they need to be washed after use, which can be challenging in a public restroom. The 12-hour wear time is the workaround.
Many people empty their cup at home in the morning and again in the evening, and never deal with it at work or school. If you do need to empty it on the go, wipe it with toilet paper or a cup wipe and reinsert it, then wash it properly at home. Here's a step-by-step guide to cleaning your menstrual cup in a public toilet.
If your period also changes your bathroom habits, that's common. Lunette explains why you might poop more on your period.
When to see a doctor
Mild pressure in the first cycles is normal. Talk to a doctor if you have pain that continues after the cup is out, trouble peeing or emptying your bowels once the cup is removed, or signs of infection such as fever, itching or unusual discharge. The FDA advises stopping cup use and contacting your healthcare provider if you have itching, rash, pain, swelling or discomfort. Rarely, a cup in the wrong position can press on the urinary tract: the Lancet review recorded nine urinary tract complaints across all the studies and reports it found.
Frequently asked questions
Can you poop with a menstrual cup in?
Yes. Check afterwards that the cup is still in place, since bearing down can move it lower.
Can you pee with a menstrual cup in?
Yes. Pee comes from the urethra, not the vagina, and Lunette's instructions say there's no need to remove the cup to pee.
Do I have to take my cup out to poop?
No. Some people prefer to, and many combine emptying the cup with a bathroom trip they'd make anyway.
Why did my cup come out when I pooped?
It was probably sitting low or hadn't opened fully, or you were straining. Insert it a little higher, check it's fully open, and consider the softer Size 1 if it keeps happening.
Can you pee and poop with a menstrual cup in at the same time?
Yes. Neither needs the cup out. Just check the cup afterwards and wipe front to back.
Why does my menstrual cup smell like poop?
Usually because of handling: always wipe front to back and wash your hands before touching the cup. Wash the cup each time you empty it and boil it for 5 minutes after each cycle.
Ready to try one? The Lunette menstrual cup costs $29.99 in either size, US shipping is free on orders over $50, and it comes with Lunette's fit promise: give it 2 to 3 cycles, and if it clearly doesn't work for you, Lunette will refund it or send the other size, with nothing to return.
About the author: Aleksandra Oklińska is the CEO of Lunette, the Finnish menstrual cup company founded in 2005.
Sources
- Sirvent-Pinar MÁ, Meléndez-Oliva E, García-García A, et al. Urinary and bowel perceptions during menstrual cup use among healthy women. Sexual & Reproductive Healthcare, 2026;49:101268.
- van Eijk AM, Zulaika G, Lenchner M, et al. Menstrual cup use, leakage, acceptability, safety, and availability: a systematic review and meta-analysis. The Lancet Public Health, 2019;4(8):e376–e393.
- US Food and Drug Administration. Menstrual cups.
This article is general information, not medical advice.
