More people are employed in the health care sector than in any other industry in the United States. Health care workers are exposed to a wide variety of hazards, including biological, chemical, physical and psychological stressors. Concerns about exposure to contagious diseases such as HIV, Hepatitis B and C, and tuberculosis have influenced the career choices of many health professionals. Physical hazards, especially ergonomic ones, account for the majority of the disability faced by health care workers. Chemical exposure and psychosocial stresses are also present in health care institutions. The exposure encountered in health care facilities is potentially dangerous to health care workers as well as to their family members and unborn children.