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Select a latex free product. Talk to your doctor if you have an IUD. Avoid using a menstrual cup if you have certain medical conditions. Know if you are at risk of endometriosis.
If you are allergic to latex, some menstrual cups are made of materials that are safe. Read the product literature to be sure. Select a cup made of medical-grade silicone if you have a latex allergy. Most doctors recommend against using a menstrual cup if you have an IUD in place.  There have been reports of IUD’s being dislodged during insertion or removal of a menstrual cup.  Check with your doctor to be sure it is safe for you to try a menstrual cup before you purchase one. Check with your doctor to be sure it is safe for you if you have any concerns.  Do not use a menstrual cup if you have recently delivered a baby or recently had a miscarriage or abortion.  Do not use a menstrual cup if you have been told you have a tilted uterus.  Avoid using a menstrual cup if you were told to avoid using tampons due to a surgical procedure or other medical condition.  Do not use a menstrual cup if you have a condition called pelvic organ prolapse. Talk to your doctor about this prior to trying a menstrual cup. This is extremely unlikely, but you may wish to discuss it with your doctor. One case report of endometriosis was linked to the use of a menstrual cup. The FDA considers the use of menstrual cups to be safe, but discuss this with your doctor if you have any concerns.