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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.

Article:
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.