在疾病过程中,正气同邪气双方势力的对比决定着疾病发展变化的趋向。正胜则病变逐渐消退而痊愈,邪胜则病变继续发展加重。因此,治病的目的就是要保存正气,祛除邪气,促进疾病痊愈。《内径》说:“邪气盛则实,精气夺则虚”,“虚则补之,实则泻之”,补虚泻实就是扶正与祛邪 In the course of the disease, the comparison of the forces of righteousness and evilness determines the trend of disease development. If the victory is successful, the lesion gradually fades and heal, and if the evil wins, the lesion will continue to develop. Therefore, the purpose of treatment is to preserve the righteousness, eliminate evil, and promote disease recovery. “The Inner Diameter” says: “The evil spirits are full, the spirit is good and the emptiness is empty,” and “the deficiency is the complement, but the real thing is the diarrhea.”