 For example, some physicians work in pharmaceutical research, occupational medicine (within a company), public health medicine (working for the general health of a population in an area), or join the armed forces.In the United States a medical school is an institution with the purpose of educating medical students in the field of medicine.Admission into medical school may not technically require completion of a previous degree; however, applicants are usually required to complete at least 3 years of "pre-med" courses at the university level because in the US medical degrees are classified as Second entry degrees.