Two studies suggest that cognitive dissonance can lead people to adopt negative attitudes toward beneficial—yet unpleasant—medical screenings. People who thought that they were candidates for an unpleasant medical screening reported less favorable attitudes toward the screening than people who thought that they were ineligible (Study 1). The unpleasantness of a medical screening affected candidates’ attitudes toward the screening to a greater extent than non-candidate’s attitudes (Study 2). Limitations, including ambiguity regarding the extent to which participants’ attitudes were affected specifically by dissonance, are discussed. This preliminary research suggests people attempt to reduce dissonance associated with their anticipated behavior.