Lots of Flex Disc users have IUDs! Flex menstrual discs were designed to be IUD-friendly—they do not rely on suction to stay in place.
There is a small risk of any internally worn menstrual product getting caught on your IUD, including tampons, menstrual discs, and menstrual cups. That’s why we recommend consulting with your healthcare provider or Ob/Gyn prior to using a new period product if you have an IUD. They will have more information about your specific IUD and how it’s positioned in relation to your internal anatomy. They can also trim your IUD strings shorter if needed.
For more info, check out our blog article about using menstrual cups and discs with an IUD.