In Canada in 2017, only 2,617 of the 13,690 applicants were admitted to medical schools. An astonishing 81% of the applicants- many of whom would make phenomenal physicians- found themselves rejected at home. For many people considering medicine, becoming a doctor is a calling. So, a large percentage of those Canadian applicants without a seat looked abroad—most of them to the Caribbean, but some considering Ireland, Australia, and Eastern Europe as well. But, what happens when school is over? In 2018, of the 1,758 international medical graduates (IMGs)- most of whom were Canadians that tried to match back home- only 123 were selected. This is by no means to say that this isn't still a viable path for Canadians, and a fair number of Trinity graduates have matched in places like Ontario, Calgary, British Columbia, Alberta, and Manitoba.
The point is that the decision to study abroad is a major one, with many factors to consider, from proximity to home, to academic approach, matching, cost, and long term career plans.