There have been many studies that have been conducted so far in order to unravel the process in which migration, population, and the idea of global health are related to each other. There have been many forces that are becoming applicable to each passing day. There are many trends which are following this evolution. Additionally, there have been forces of displacement in which there have been issues wherein the people are provided with the best possible research to discover the intricacies of this theory. There have been sociodemographic and natural models that have been created so far to unravel the realities of this information. Therefore, what matters at the end is the final conclusion which states that the working-age population in the countries of Spain and Japan is becoming more prone to the diseases sue to which they are looking for the plans to get themselves shifted from one place to another in the minimum possible time. This is is the reason why migration is increasing with increasing times.
Ref art: https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(20)31523-3/fulltext