The perception of health care risk: patients, health care staff and society.

Introduction: The Nuovo Zingarelli, dictionary of the Italian language, defines risk as "the possibility of harmful or negative consequences following not always predictable circumstances". A statistical-epidemiological type of definition is far removed from the social and psychological conception that the population attributes to the risk of harm, which is related to interior processes and emotional reactions. Information on risks interacts with knowledge, personal values and beliefs to produce a subjective expression that is perception.