I am in Med School now, though I didn't major in Math. I don't know too many Med Student (or pre-Meds, at the time) who were Math majors. I would have to agree with some of the prior postings on this site emphasizing the fact that:
1. Being a Math major (while not common) will not add much "strength" to your application in the way of uniqueness and 2. Even though the courses are tough, you're not likely to be cut much slcak for a less-than-ideal GPA (just ask pre-Med Biomed engineers!). That said, you could emphasize your systematic approach to Math and how that may help in dealing with patient-care issues though, as someone had said, Medicine maybe less "clean and precise" than Math. At the end of the day, Med School AdCom's focus, primarily, on MCAT scores, Science GPA, overall GPA and then other things like research/significant ECs. This focus doesn't change much based on applicant major, gender, etc. I don't think it will be addressed that often in your interviews and, if it is, I doubt it will help or hurt you much, one way or the other. Nonetheless, good luck in your applications!