All the ob/gyns I have had have said IUDs are only recommended for women in monogamous relationships and who have already had children. I took that to mean that an IUD would make future pregnancies risky. And the monogamy thing is due to IUDs increasing the problems associated with STDs and getting rid of STDs. I guess these enlightened doctors want women to have no babies at all and/or to be dead.
Adverse effects
Further information: IUD with progestogen and IUD with copper
Regardless of containing progestogen or copper, potential side effects of intrauterine devices include expulsion, uterus perforation, pelvic inflammatory disease (especially in the first 21 days after insertion), as well as irregular menstrual pattern. A small probability of pregnancy remains after IUD insertion, and when it occurs there’s a greater risk of ectopic pregnancy.
Substantial pain that needs active management occurs in approximately 17% of nulliparous women and approximately 11% of parous women.[32] In such cases, NSAID are evidenced to be effective.[32] However, no prophylactic analgesic drug have been found to be effective for routine use for women undergoing IUD insertion.[32]
Also, IUDs with progestogen confer an increased risk of ovarian cysts[citation needed], and IUDs with copper confer an increased risk of heavier periods.
Menstrual Cup companies recommend that women with IUDs who are considering using menstrual cups should consult with their gynecologists before use. There have been rare cases in which women using IUDs dislodged them when removing their menstrual cups, however this can also happen with tampon use.
Source: Wikipedia