Accidental insertion of multiple IUDs.

Data are presented for 7 women, each having two IUDs in utero. Five of these patients developed symptoms of abnormal bleeding and/or pelvic pain and 2 were asymptomatic. Three women had received the second IUD because it was assumed the first one had been expelled when the filaments were no longer palpable or visible. Other causes, as well as the prevention, diagnosis, and potential danger of this complication, are discussed.