This dataset contains the data of an observational prospective cohort study. This study evaluates medical students’ attitudes towards addiction, dementia, and diabetes. Participants were sixth year medical students of the Radboud University Medical Center (Radboudumc). They were recruited from the training in the Primary and Community Care from February 2016 – January 2017. The attitudes were measured three times during this training, using the Medical Condition Regard scale (MCRS).