Sun Simiao, a famous doctor in the Tang Dynasty, clearly pointed out in his book "A Good Way to Save an Emergency": "It is disloyal to filial piety to get a disease that can't be cured by relatives." If you can't treat your monarch or your relatives when they are sick, then you are disloyal and unfilial.
The book, also known as Qian Jin Fang, has a total of 30 volumes, which brings together a large number of medical materials before the Jin and Tang Dynasties. The contents include medical ethics, medical education, treatment principles, diagnosis, prescription, syndrome differentiation and treatment of women and children's diseases, facial features, internal and external diseases, first aid, diet therapy, indoor, pulse diagnosis, acupuncture and acupoint selection, etc.