Can ghosts physically hurt people?
Generally not. The one exception is people who are electrically sensitive. Research on this subject shows that people that are susceptible to this phenomena may have side effects such as rashes, bursting of capillaries (bruises) and nausea to mention only a few. However, even these are extremely rare cases. Static magnetic fields (0 Hz) with strengths of about 4 T can produce a variety of symptoms including nausea, metallic taste in the mouth, and vertigo.
