If medical school is your holy grail, undergraduate programs are available to guide you on your quest for admission. But it’s not a major -- what you choose to major in is up to you.
Students often choose majors in chemistry or biology because they must take several classes in these fields. However, medical schools are also impressed by students with diverse interests. For example, if you have a passion for music, you may want to indulge it before concentrating on your medical studies. As long as you fulfill all of the prerequisite courses for med school, feel free to choose a non-science major.