The magnetic field generated by a neutron star would likely extract the iron from your bloodstream; however, you would already be deceased due to the intense gravity. The static magnetic fields that we can create on Earth are typically safe — provided you do not have an iron wrench in your pocket! I once made that error; fortunately, my body was not positioned between the magnet and the wrench.
Large static electric fields tend to discharge through the medium to which they are applied. If that medium is your body, ZAP! This phenomenon is referred to as electrocution.
For time-varying electromagnetic fields, the effects depend on the wavelength and frequency. Intense microwave fields at the resonant frequency of water or fat molecules can heat you just as effectively as they cook your steak; this is the reason your microwave oven is equipped with a Faraday cage.
Extremely powerful radar signals can also cause cooking effects.
As the frequency ascends into the ultraviolet or X-ray range, you may experience radiation damage or even more severe consequences. (A sunburn is indeed a legitimate radiation burn!)
Moreover, gamma rays are significantly ionizing in nature.
If you are referring to your WiFi and cell phone signals, as I suspect you might be, disregard that concern! They are considerably less harmful than nearly everything else in your surroundings.
Source:
https://www.who.int/news-room/questions-and-answers/item/radiation-electromagnetic-fields#
