Is an IUD suitable for all women? Most women can safely use an IUD. Your doctor will review the suitability of the method with you prior to insertion. In assessing your suitability, consideration is given to a number of important factors: current menstrual and bleeding patterns unexplained vaginal bleeding (this should be investigated before using an IUD) a recent history of a sexually transmitted infection or PID uterine or cervical abnormalities any history of breast, cervical or uterine cancer pregnancy history cervical screening history any allergies including copper allergy the timing of insertion and pain relief needs for the insertion procedure