It allows exploration - Taking introductory classes for a different major will allow you to learn about other areas of study, and can open your eyes to new passions.
Biological Sciences - According to the Association of American Medical Colleges (AAMC), more than half of medical school applicants, as well as matriculants, major in the biological sciences.
Physical Sciences - A sizeable number of medical school hopefuls major in the physical sciences. Like biological sciences, these offer training that is often directly applicable to medical school curricula.
Math and Statistics - While math and statistics majors make up a small percentage of medical school applicants and matriculants, as a group they have the highest mean overall AMCAT score and mean GPA.
Social Sciences - About ten percent of medical school matriculants come from social sciences majors. Some of these, like economics, may have requirements that overlap somewhat with your pre-med curriculum.
Humanities - A little less than four percent of medical school matriculants come from humanities majors. Majoring in a humanities subject such as modern or classical languages, literature, or philosophy will certainly set you apart from other medical school applicants.
Understanding Your Pre-Med Requirements - Make sure you meet with your major and pre-med advisor at least once per semester to confirm that you are on the right path to graduation.
Thinking Like a Medical School Admissions Committee - While your choice of major might feel like a significant decision—and it is—keeps in mind that your major is not the most important factor in an admissions decision.