Bradley thought that his age was not appropriate to study for the ministry so he began studying medicine in the office of an Auburn physician. Bradley took a brief reprieve from his studies due to health concerns, but resumed his studies for a year in Penn Yan, New York. After a year of studying, Bradley attended lectures at Harvard University in 1830 before taking another break to earn money to continue his education. Bradley enrolled at New York University and graduated in April 1833 as a Doctor of Medicine.