Answer:
12 years of school, four years of college and four years of medical school.
The first year of training after medical school is called an internship, or more commonly it is called first year of residency or PGY-1 (Post-Graduate Year-1). The following years are called PGY-2, PGY-3, etc. The training that is done after a residency (in a subspecialty) is usually called a fellowship. Much of what you will learn in your chosen specialty will be learned in your residency.
Osteoporosis is a term that describes the loss of calcium from bones resulting in bones that are thin. Since parathyroid hormone (PTH) removes calcium from bones (that is what it does), all patients with a parathyroid problem will eventually develop thin bones. Bones with osteoporosis due to parathyroid problems can ache and hurt because the PTH is actively destroying the bone. Bones with osteoporosis are fragile bones which are much more susceptible to fractures and breaks.