Although students of any major can be accepted to medical school, most people pursuing a career in healthcare take courses in biology, chemistry and mathematics during their undergraduate years. Many students opt to major specifically in biology to prepare them for the rigors of a medical degree program.
Medical education is generally divided between four years as a college undergraduate, and four years in a medical degree program. Medical schools require students to have a background in basic scientific concepts, especially biology and chemistry, but they do not necessarily require students to have majored in any particular subject.
Some common prerequisites to being accepted into medical school include two semesters of biology lab courses, two semesters each of organic and inorganic chemistry, two semesters of physics lab, and two math semesters up to and including Calculus. Most schools also require two semesters of English courses.
As of 2015, 51 percent of all students entering medical school are biology majors. Some schools offer programs where students can earn their Bachelor's and medical degree together. These B.S./M.D. programs may restrict themselves to students from certain majors, but many ordinary medical programs are actually seeking to diversify by accepting students from outside the usual scientific fields. Non-science majors do need to show high aptitude in science, though, to prove they have the necessary skills to finish medical school.