A doctor, practitioner, intern, junior doctor or just doctor, is someone who practices internal medicine, that is, medicine that deals with the diagnosis, prevention, and treatment of illness, injury, and various physical and mental disabilities. In United States, there are presently around 550 licensed doctors and surgeons. Some have advanced degrees, while some are licensed and practicing medicine in their own right, without having an advanced on this information Medical education means studying from the time you attain puberty until the time you graduate from medical school. The curriculum of medical schools may include biology, chemistry, mathematics, anatomy, pharmacology, radiology, and many more. After you complete your medical schooling, you can find employment as a doctor in a hospital, government facility, clinic, or any other medical facility. Some physicians work for private websites Doctor of medicine programs give students the knowledge, skill, and experience to become highly skilled doctors. Some states require aspiring doctors to pass a state medical board exam before they can take the examination for the state licensing board. Other states do not have a licensing requirement. Most medical students have to pass the national certification exam for medical assistants (NCLEX-RN), which is nationally recognized as a preparation course for the NCLEX-PT examination for the professional licensing of a doctor. After passing the state medical board exam, students have to get admitted to an accredited university or college, pass a series of tests, and attend classes for two years, depending on the program. Many universities and colleges have interdisciplinary programs that allow students to pursue a career as a doctor even if they did not get an undergraduate degree in the field.