@thumper1 hit the highlights, but here are some more information–
All federal student loans for professional school are UNsubsidized. Interest starts accruing upon disbursement. Health profession students are limited to a maximum off $40.5K/year in federal student direct loans. Assuming good credit, students may take out up to the published COA in Grad Plus loans (higher interest rates, higher origination fees).
There are 2 options for attending health professions school on scholarship that pays tuition plus a living expenses stipend. Both are scholarship-for-service programs.
[Health Profession Scholarship Program](Army Medical Scholarships | goarmy.com) which requires enlistment in a branch of the military and requires 4 years of service as a military physician starting upon the completion of intern year or residency, depending upon the needs of the service.
[National Health Service Corps Scholarship](Scholarships | NHSC) which requires the recipient specialize in a primary care specialty (FM, general IM, OB/GYN, pediatrics) and serve as a physician for a minimum of 4 years post-residency in a federally designated medically underserved area.
If you want to see the COAs at various medical schools–AAMC has a spreadsheet of costs here: https://www.aamc.org/data/tuitionandstudentfees/