Piercing and jewelry are made from various materials including ferromagnetic and non-ferromagnetic metals.

The risk ranges from feeling discomfort, temperature rise, burns and even dangerous shifts depending on the amount of ferromagnetic material ("degree of magnetic susceptibility").

As most of the time the composition of these jewels is not known, it is advisable to remove them prior to the exam.

Note:
The information posted on this site should not be considered medical advice. Do not forget that Medicine is a science in constant transformation and countless works and evidences are modified every day.
If you are a non-medical reader, consult your physician about any medical issues related to diseases, conditions, symptoms, diagnosis, treatment and side effects.