Some speculate that urban crime is both cause and effect in itself. Thus, the notion of urban psychosis, the psychological mutation and destruction of those living in violent urban areas, is a means by which the proliferation of urban crime may be explained. Some physicians liken urban psychosis to post-traumatic stress disorder, which relates the experience of inner-city teens to those affected by war, natural disaster and family violence. Current discussion on urban psychosis poses serious ethical, medical and legal questions, which include the degree of personal responsibility in the case of inner-city crime.