Concentrating on second language reading motivation as an important construct with different constituents, this study sought to investigate the factors that majorly motivated medical students to read in English, and to find the orientation of the students in terms of intrinsic and extrinsic motivation. The data were collected from a sample of 131 students in Fasa University of Medical Sciences, Iran, using questionnaires and semi-structured interviews. On the basis of the data collected, the researchers found that among the eight constructs of L2 reading motivation proposed by Komiyama, the lowest mean value was found in the construct "social sharing", whereas the highest mean value was found in the construct "grades". Moreover, it was observed that the medical students were both extrinsically and intrinsically motivated.