疫邪已退，脉证俱平，但元气未复，或因梳洗沐浴，或因多言妄动，遂致发热，
前证复起，惟脉不沉实为辨，此为劳复。盖气为火之舟楫，今则真气方长，劳而复折，真气既
亏，火亦不前，如人欲济、舟楫已坏，其可渡乎？是火也，某经气陷，则火随陷于某经，陷于经络则为表热，陷于脏腑
则为里热，虚甚
热甚，虚微热微。治法∶轻则静养可复，重则大补气血，候真气一回，血脉融和，表里通畅
，所陷之火，随气输泄，自然热退，而前证自除矣。若误用承气及寒凉剥削之剂，变证蜂起
，卒至殒命，宜服安神养血汤。
若因饮食所伤者，或吞酸作嗳，或心腹满闷而加热者，此名食复，轻则损谷自愈，重则消导方
若无故自复者，以伏邪未尽，此名自复，当问前得某证，所发亦某证，稍与前药，以彻其余
邪，自然获愈。
安神养血汤
茯神 枣仁 当归 远志 桔梗 芍药 地黄 陈皮 甘草
加龙眼肉，水煎服。
疫邪伏而未发，因感冒风寒，触动疫邪，相继而发也，既有感冒之因由，复有风寒
之脉证，先投发散，一汗而解，一二日续得头疼身痛，潮热烦渴，不恶寒，此风寒去，疫邪
发也，以疫法治之。
疟疾二三发，或七八发后，忽然昼夜发热、烦渴不恶寒、舌生苔刺、心腹痞满、
饮食不进，下证渐具，此温疫着，疟疾隐也，以疫法治之。
温疫昼夜纯热、心腹痞满、饮食不进、下后脉静身凉，或间日、或每日、时恶寒而后发热如
期者，此温疫解，疟邪未尽也，以疟法治之。
The epidemic pathogen has receded, and both the pulse and symptoms have normalized, but the primordial qi (vital energy) has not yet recovered. If fever arises due to combing hair, washing, bathing, excessive talking, or overexertion, causing the previous symptoms to reappear, this is distinguished by the absence of a deep and solid pulse; this condition is termed "relapse due to fatigue" (Lao Fu). Qi serves as the vessel for fire (metabolic heat/pathogenic heat); now that the true qi is just beginning to grow, exertion causes it to be broken again. Since the true qi is deficient, the fire cannot advance. It is like a person attempting to cross a river with a damaged boat—how can they cross? This fire follows the sinking of qi in a specific channel; if it sinks into the meridians, it manifests as exterior heat; if it sinks into the zang-fu organs, it manifests as interior heat. Severe deficiency leads to intense heat, while mild deficiency leads to slight heat. Treatment: For mild cases, quiet rest allows recovery; for severe cases, substantial tonification of qi and blood is required. Once the true qi returns, the blood vessels harmonize, and the interior and exterior flow freely, the sunken fire is transported and excreted along with the qi. Naturally, the fever subsides, and the previous symptoms disappear. If Chengqi Decoction (Cathartic Decoction) or cold and cooling purgatives are mistakenly used, various complications will arise, potentially leading to death. It is appropriate to administer Anshen Yangxue Tang (Calming the Spirit and Nourishing Blood Decoction).
If the relapse is caused by dietary injury, manifesting as acid regurgitation, belching, abdominal distension accompanied by fever, this is termed "relapse due to diet" (Shi Fu). Mild cases resolve spontaneously by reducing food intake, while severe cases require digestion-promoting and stagnation-resolving treatments.
If the recurrence happens without any obvious cause, it is because latent pathogens remain unresolved; this is termed "spontaneous relapse" (Zi Fu). One should inquire about the previous syndrome and observe if the current manifestation matches it. Administering a small amount of the previous prescription helps eliminate residual pathogens, leading to natural recovery.
Anshen Yangxue Tang (Calming the Spirit and Nourishing Blood Decoction):
Fushen (Poria with Hostwood), Zaoren (Semen Ziziphi Spinosae), Danggui (Radix Angelicae Sinensis), Yuanzhi (Radix Polygalae), Jiegeng (Radix Platycodonis), Shaoyao (Radix Paeoniae Alba), Dihuang (Radix Rehmanniae Praeparata), Chenpi (Pericarpium Citri Reticulatae), Gancao (Radix Glycyrrhizae).
Add Longyanrou (Arillus Longan), decoct in water, and take orally.
When epidemic pathogens lie latent and unmanifested, a contraction of wind-cold may disturb them, causing subsequent onset. There are both the etiology of common cold and the pulse/symptoms of wind-cold. Initially, administer dispersing agents to resolve the condition through sweating. After one or two days, headache, body pain, tidal fever, irritability, thirst, and absence of aversion to cold may occur; this indicates that wind-cold has departed and the epidemic pathogen is emerging. Treat according to epidemic disease protocols.
After malaria has manifested two or three times, or seven or eight times, sudden onset of day-and-night fever, irritability, thirst, absence of aversion to cold, prickly tongue coating, epigastric and abdominal fullness, and inability to eat occurs, with signs suitable for purgation gradually appearing. This indicates that warm epidemic disease is manifesting while malaria is receding; treat according to epidemic disease protocols.
In warm epidemic disease characterized by constant day-and-night fever, epigastric and abdominal fullness, and inability to eat, if purgation results in a calm pulse and cool body, or if chills followed by fever occur at regular intervals (every other day or daily), this indicates that the warm epidemic has resolved but malaria pathogens remain incomplete; treat according to malaria protocols.