If i have a iud an my period lasts over 7 days an it has a foul odor what is that?

IUD: Though an excellent form of bc in monogamous woman, an iud can cause periods to be longer and heavier.Also, women with iuds can be more susceptible to developing pelvic inflammatory disease especially if having multiple partners and not using barrier contraception(i.e. Condom). Foul smell usually indicates a bacterial overgrowth/infection and you should be examined, internally, by a gynecologist.