Welcome to HealthcareMagic forum.
is due to the local foriegn body like reaction which an IUD
is known to create, in fact pain is one of the most common complication of inserting an IUD.This may last for a day or two. If the pain is dull and you can put up with it, no problem, if it gets very severe with cramps
, you must get it removed and try for other methods of contraception
Wish you good health