An IUD or intrauterine device can have many different side effects. If you feel you have any condition related to your IUD, I would discuss it with the OB/GYN who placed it as he or she would have the most specifics with your case.
In general, it is possible for an IUD to cause nausea. Nausea may occur in the setting of IUD infection, uterine perforation or ectopic pregnancy, but normally these problems would have many other symptoms. Nausea alone caused by an IUD is possible, but it depends on what type of IUD you received. There are two types, a copper based IUD (such as ParaGaurd) will rarely cause nausea alone. If you develop nausea after this--I would recommend evaluation by your internist
as this is either unexpected or unrelated.
The other type of IUD is a hormone IUD that releases levonorgestrol. This is commonly known as the Mirena device. This hormone is similar to progesterone and can, in some women cause nausea. This happens as the hormone can have effects on the muscle cells of the GI tract. When these cells are weakened, the transit of food down your system is slowed, which then results in nausea.
I recommend you discuss this with your primary care physician
and ob/gyn. Good Luck!