Guidelines for communicating bad news to patients have been published and training programs for this task have been included in graduate and post-graduate medical courses. The aim of this review was to evaluate evidence_ of the efficacy of these trainings in the medical literature. Only seven controlled trials, four of them randomized, were found. Four for them showed improvement in communication skills in the trained apprentices. These findings suggest that training undergraduate and post-graduate doctors in the skills for communicating bad news may be beneficial but there are important limitations to reach a definitive conclusion. These limitations are discussed.