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After the recovery from *Shanghan* (Cold Damage), heat may reappear. It is triggered by improper diet or exertion, disturbing the meridians. If the pulse is excess (*Shi*), use purgation; if floating (*Fu*), use sweating. *Da Chai Hu Tang* (Major Bupleurum Decoction) combined with mouse feces (*Shu Shi*) has a mild temperature.

"Laofu" (Relapse due to exertion) and "Shifu" (Relapse due to diet) refer to conditions where, shortly after recovering from *Shanghan*, the blood and qi are not yet balanced, and residual heat remains. If it recurs due to physical labor, it is called Laofu. It is treated with Zhishi Zhizi Chi Tang (Gardenia, Immature Bitter Orange, and Fermented Soybean Decoction) and Xiao Chai Hu Tang (Minor Bupleurum Decoction). The appropriate method is to harmonize the middle jiao to dissipate the heat. If it recurs due to overeating, it is called Shifu. It is treated with Zhizi Dahuang Tang (Gardenia and Rhubarb Decoction) and Da Chai Hu Tang (Major Bupleurum Decoction), clearing yang to dissipate heat.

Complicated diseases (*Huabing*) often arise from errors in sweating or purging. Failure to resolve after the meridian cycle has passed (exceeding twelve days) is the fault of the physician. Adding Mangxiao (Mirabilite) to Chai Hu Tang treats this, effectively releasing the exterior while simultaneously purging the interior.

"Guojing bujie" (Failure to resolve after passing the meridian) refers to cases where *Shanghan* should have healed within twelve days but has not, leading to further transmission. This is termed Guojing and constitutes a Huabing. It is mostly caused by inappropriate sweating or purging. It should be treated with Chai Hu Jia Mangxiao Tang (Bupleurum Decoction with Mirabilite) to release the exterior and attack the interior.

Wenre (Warm Malaria) often develops from complicated diseases. Symptoms include alternating chills and fever, starting with cold followed by heat, occurring frequently. Xiao Chai Hu Tang (Minor Bupleurum Decoction) added with Gui Zhi (Cinnamon Twig) is specifically effective. Baihu Jia Renshen Tang (White Tiger Decoction with Ginseng) can effectively calm the condition.

Wenre occurs when winter cold pathogens are contracted, followed by spring cold triggering an outbreak. The pulse is vigorous at all three positions (Cun, Guan, Chi). Symptoms present as fever preceding chills, or alternating chills and heat. This is a complicated disease caused by cold. It is treated with Xiao Chai Hu Tang (Minor Bupleurum Decoction) with a small amount of Bo Gui (Thin Cinnamon Bark). If heat predominates, double the Chai Hu (Bupleurum); if cold predominates, double the Gui Zhi (Cinnamon Twig). If heat is severe accompanied by irritability, Ren Shen Bai Hu Tang (Ginseng White Tiger Decoction) is indicated. Generally, Wenre associated with *Shanghan* differs from miscellaneous diseases and must be treated based on syndrome differentiation.

Extreme thirst may lead to drinking up to one Dou (ancient unit) at once. One should limit intake to two or three Sheng. If uncontrolled water intake is allowed without proper treatment, forcing fluids will undoubtedly cause other diseases. Floating pulse with thirst indicates Taiyang disease; sweating with thirst indicates Yangming disease; thirst with spontaneous diarrhea indicates Shaoyin disease. These three must be carefully distinguished. Do not offer water unless there is extreme thirst. For mild thirst, only moistening is suitable. Excessive drinking leading to fullness below the heart results in Water Binding (*Shui Jie*), which is difficult to regulate.

Yangming disease involves thirst, bitter taste, and headache. Water held in the mouth is not swallowed, potentially leading to epistaxis (nosebleed). Stagnant blood causes mania. The patient presents externally without chills or fever.

According to the principle that Yangming interior heat induces desire to drink, holding water in the mouth without swallowing indicates heat in the meridians but no heat in the interior. Yangming meridians have abundant blood and qi; excessive meridian heat forces blood to move recklessly, predicting epistaxis. Treat with Xijiao Dihuang Tang (Rhinoceros Horn and Rehmannia Decoction) and Maohua Tang (Reed Flower Decoction). In the absence of exterior symptoms, without chills or fever, with chest/abdominal fullness, dry mouth/thirst, holding water without swallowing, and frequent urination, this is blood stasis leading to mania. Treat with Tao Ren Cheng Qi Tang (Peach Kernel and Martial Law-Decreasing Decoction). Severe cases use Didang Wan (Didang Pill), administered until black stool is expelled. Additionally, for Shaoyin disease with deep/fine pulse, cold limbs, occasional irritability/thirst, and desire to hold water without swallowing, Si Ni Tang (Four Reversal Decoction) is indicated. For diarrhea, reversal cold, absent pulse, dry retching, irritability/thirst, and desire to hold water without swallowing, Baihu Zhu Zhuyejia Zhuru Nianye (White Tiger Decoction with Pig Gallbladder and Human Urine) is indicated. For dry lips without desire to swallow, Lizhong Tang (Regulate the Middle Decoction) with Wumei (Mume Fruit) is indicated. Generally, Yin syndromes presenting with dryness, irritability, and thirst where drinking is impossible, or where drinking leads to vomiting later, or belching, indicate internal cold. This is rootless fire wandering the throat, feigning dryness/thirst, thus preventing drinking. Conversely, if the patient can drink without vomiting and desires more, it is a Heat syndrome.