Hygiene refers to collective life hygiene and production hygiene. Generally speaking, it refers to personal and social health measures taken to improve human health, prevent diseases, and improve and create a production environment and living conditions that meet physiological and psychological needs, including patriotic health campaigns centered on eliminating diseases and stressing hygiene. According to the research of medical history, "health" is a medical term, which means "keeping healthy". This word first appeared in Lingshu, and there is also a word "health preservation" in Zhuangzi Gengsang Chu: "Nan Rong said: I really want to know the classics of health preservation." Others believe that the word "health" comes from Greek mythology. "Hygiene" refers to myth.