Your symptoms aren't fully explained by a general medical condition, drug use or a culturally accepted behavior, such as experiencing visions at a religious ritual.

CNN: Conversion disorder

Recent studies by researchers at Massachusetts General make the case that the risks of death from a current medical condition often far outweigh the risk of radiation.

WSJ: New Tracking of a Patient's Radiation Exposure

Boston Medical Center said it had received 23, and Massachusetts General Hospital was treating 22 patients, including six in critical condition and five in serious condition.

WSJ: Two Explosions at Boston Marathon Finish Line