It is my understanding that one of the provisions of NAFTA was to shut down any medical practice less than 100 miles south of the Mexico-US border.
My cousin was getting an alternative treatment for cancer (i.e., ozone therapy) from a Mexican physician, and his clinic was shut down; her cancer returned, and by the time she found the physician again, it was too advanced to stop, and she died.
That is incredibly sad. I heard that both Costa Rica and India both have quite developed health tourism