EDIT: In the essay I describe why it can become so hard to leave medicine after one has invested more than a year or two in med school because of student loans; that may help explain the suicide issue: people who feel trapped may in turn feel like death is the only way out.
A surprisingly large number of doctors hit residency and realize they don't want to become doctors. In most professions that's not a tremendous problem, but in medicine the only way to pay back $100 – $250K in graduate student loans is by becoming a doctor.