The essay refers to "argumentative essay", which is a common form of expression in the genre of medical papers and has a specific concept. It is the author's own achievements, experiences and understandings in scientific research, clinic and teaching. It is a written work formed by strict logical argumentation and standardization, and it is the most typical and representative style in medical papers. "Thesis" is an article that discusses and studies a certain problem, and "academic paper is an article that systematically and specifically discusses and studies a certain knowledge"; Scientific papers should discuss some important new knowledge of experiments, theories or observations, or the progress of a known principle in practical application. On the surface, there is not much difference.