In the theoretical system of traditional Chinese medicine, external evil and invagination are a common and important pathological change. When the evil qi from the outside world invades the human body, due to the lack of righteous qi in the human body, these evil qi may penetrate deep into the body, causing the function of the internal organs to be disordered. In this regard, the principle of ** is to "open the surface and support the inside", that is, by regulating the body's qi, so that the evil qi is discharged from the original path. Taking the evil of Shaoyin as an example, the ancients believed that the evil qi of Shaoyin Sutra often passed through the Sun Sutra as a way out. In the same way, the evil qi of the Sun Sutra will also look for the Yang Ming Sutra as a way to expel it. Therefore, when the external evil is trapped for a long time, if the evil qi can be observed to be discharged from the manifestation after taking the medicine, it is a sign that the condition is improving. In daily life, it is not uncommon for external evils to fall inward. Such as fever, stomach pain, diarrhea, dysentery, edema, blood in the stool, down the belt, leakage, rash and boils, etc., are all related to external evil and invagination. The best of these diseases requires us to deeply understand the mechanism of external evil and internal invagination, so as to formulate an appropriate plan. As a classic work of traditional Chinese medicine, "Treatise on Typhoid Fever" is a detailed and in-depth discussion of external evils and invagination. Scholars should conduct in-depth research on this in their daily study, and constantly improve their ability to distinguish and treat in combination with the relevant expositions of Dongyuan, Danxi and other doctors. If we can master the method of distinguishing and treating external evil and internal invagination in practice, it is undoubtedly a great progress on the road of medicine. 
Yu Yutang Youlang, due to sores, applied drugs externally, but the sores became more and more swollen, but the diet and stool were as usual. Several doctors came for diagnosis and treatment, and after several treatments, they were unable to recognize that the sore was actually a disease of Gu poison. The prescriptions they prescribed were nothing more than Wuling San, Ping Gao San, and the like, but they didn't work. Gradually, the swelling of the lower half of the young man's body became more and more serious, ** as transparent as crystal, like a fish bubble, and even breathing seemed laborious. Seeing this, the family members hurriedly sought the help of Dr. Yu.
Physician Yu pondered for a long time and thought that the evil qi had sunk in and that it had to be brought to the table. It is also seen that the disease is more serious than the following, so the meaning of the example is adopted. He chose the Rising Yang Stomach Soup as a prescription. After only two doses, the young man alternated between cold and heat, as if he was suffering from malaria, and his family was terrified. Physician Yu explained: "In the past, the evil qi was inward, but now it has been proposed, so that the outside and the inside are fighting, and there will be cold and heat fighting. This is a good omen for the evil to be discharged, so don't worry. He instructed the family to continue to feed the medicine. After ten doses of medicine, Youlang's condition was finally cured.
People in the world often only know that the fever is cured, but they do not know that the fever can also be a sign of recovery. The way of medicine is broad and profound, and it requires careful observation and prudent judgment by doctors in order to rejuvenate and save people from danger. Dr. Yu saved Youlang's life with his superb medical skills, showing the magical charm of Chinese medicine.
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