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In the collected works on Cold Damage (Shanghan), only four types of syndromes are described as resembling Cold Damage. However, Sha syndrome (a condition characterized by toxic heat and blood stasis often manifesting with skin eruptions or subcutaneous congestion) resembling Cold Damage is even more fierce and violent than those four types. Since Sha syndrome has never been recorded in books on Cold Damage, physicians are unfamiliar with it.

Headache, aversion to cold, and fever caused by Cold Damage belong to Wind-Cold invading the Foot-Taiyang Bladder Meridian; it is appropriate to use exterior-releasing methods because the Cold pathogen enters from the muscle layer, so dispersing should be prioritized. If the headache is caused by Sha syndrome, it is due to Sha toxin Qi attacking upward to the three Yang meridians of the head and face. It is not caused by external Cold invasion. Although the aversion to cold and fever appear at the muscle level, they are actually contracted via respiration from seasonal epidemic pathogens, which agitate and bind within the muscle layer, forming toxic heat. Internal heat manifests as external cold, hence aversion to cold also occurs. Treatment should first involve pricking the vertex to release Sha (bleeding therapy) to drain the toxin. Medication should primarily focus on venting Sha, resolving toxicity, and regulating Qi. If mistakenly diagnosed as a Foot-Taiyang Bladder Meridian syndrome of Cold Damage and treated with excessive exterior-dispersing herbs like Qianghuo (Notopterygii Rhizoma et Radix) and Mahuang (Ephedrae Herba), it will instead assist the Sha toxin and fire pathogen, intensifying the flame. This will inevitably lead to aggressive toxic attack, swelling, and immediate danger. Therefore, although Sha syndrome and Cold Damage share symptoms such as headache, aversion to cold, and fever, their treatments must differ. One must know that Sha syndrome requires cooling to resolve toxins internally, while Cold Damage requires acrid-warm dispersal to舒 (disperse) Cold externally. Thus, one must not treat Sha syndrome with methods for Cold Damage, nor treat Cold Damage with methods for Sha syndrome.

Clinical Cases:

1. The eldest son of Manager Lin presented with five days of fever and coma. Upon examination, the condition resembled Cold Damage, but the pulse was deep, thready, and weak, indicating it was truly not Cold Damage. Observing Sha veins under the popliteal fossa, I released three needles of dark purple-black toxic blood from the legs and nine needles from the fingertips. As there was no improvement, I administered Awei Wan (Asafoetida Pill) and Dahuang Wan (Rhubarb Pill) with cool tea. The coma resolved, and after two days, when his body temperature normalized, he recovered.

2. The second son of Che Wenxian suffered from twelve days of aversion to cold and fever, progressing to heavy coma and unconsciousness. When I arrived in the countryside to examine him, his complexion was red and black, his ten fingertips were cyanotic-black, and all six pulses were surging and rapid. Everyone claimed, "Given his recent marriage, the syndrome must be Yin-type." I said, "Incorrect. If treated as a Yin syndrome using warm-tonifying hot medicines, it would likely hasten his death." A surging and rapid pulse indicates Sha toxin agitating the collaterals. Cyanotic-black fingertips indicate stagnation of Sha toxic blood. Red-black complexion indicates Sha toxin rising to the three Yang meridians of the head and face. Upon examining the Sha veins in the popliteal fossa, they were faintly visible. Pricking them yielded only minute drops of dark purple-black blood. His father, familiar with Sha hazards, insisted it was true Sha. However, prior misdiagnosis led to repeated consumption of hot soups, causing toxic blood to coagulate internally and preventing effective drainage. How could this be saved? I used Baohua San (Precious Flower Powder) and Lengdongyin (Frozen Ice Water) made from Canarium Album (Late Silkworm Sand). He gradually awakened, and two Sha veins reappeared in the left popliteal fossa. Pricking them released gushing dark purple-black toxic blood, ending the coma. However, he still had fever, heaviness, inability to turn over, and shoulder/back pain. I prescribed a large dose of Taoren (Persicae Semen), Sumu (Sappanwood), Wuyao (Linderae Radix), Xiangfu (Cyperi Rhizoma), Baijili (Tribuli Fructus), Zelan (Lycopus Herba), Duhuo (Angelicae Pubescentis Radix), and Shanzha (Crataegi Fructus), taken slightly warm. Gradually, mobility returned. For persistent fever and constipation, I used Lubizi (Brassicae Semina), Maiya (Hordei Fructus Germinatus), Zhishi (Aurantii Fructus Immaturus), Dahuang (Rhei Radix et Rhizoma), Houpo (Magnoliae Officinalis Cortex), and Taoren, taken warm. Bowel movement resumed, fever subsided, and after three months of conditioning, he fully recovered.

3. The wife of Fang Ju'an presented in January with headache, aversion to cold, fever, chest oppression, thirst, dry throat, profuse sweating on the head, phlegm-panting, blackish complexion, and black discoloration of the fingertips for five days. Upon examination, the Qi-kou pulse was deficient and intermittent, while the three positions on the left hand were excessively surging and rapid. I stated, "If this is not Sha syndrome, such a pulse suggests poor prognosis." Checking for Sha veins, fortunately, her brother was skilled in Sha release. Seeing green veins, he said, "This is true Sha." We pricked the vertex, left arm crook, and right leg crook. Toxic blood was removed, but there was no improvement. Considering the illness started after a meal, I had him drink Fan Tang (Alum Decoction) slightly cooled in large quantities to induce vomiting of retained food. Chest oppression, phlegm-panting, and head sweating ceased, but other symptoms persisted. The next day, her brother performed Sha release again, and she drank a bowl of Yin-Yang Water, yet there was no improvement. I prescribed Chaihu (Bupleuri Radix), Shanzha, Lianqiao (Forsythiae Fructus), Honghua (Carthami Flos), Lubizi, Zhishi, Jingjie (Schizonepetae Herba), and Huafen (Puerariae Radix), plus 2 qian of Jiuhuang (Wine-processed Rhubarb). Taken slightly cool for two doses, bowel movements cleared, and stability was achieved. More than ten days later, severe abdominal pain and salivation occurred, indicating a recurrence of Sha triggered by foul odors. Scraping therapy provided slight relief. She took Huoxiang Zhengqi Tang (Agastache Powder for Regulating the Middle) slightly cooled, stopping abdominal pain immediately. Subsequently, she was conditioned with Buzhong Yiqi Tang (Decoction for Boosting the Middle and Augmenting Qi) and Shiquan Dabu Tang (Ten Substance Great Tonifying Decoction) until she returned to normal.

4. Zhen Fuxian presented with aversion to cold, fever, vomiting, hiccuping, irritability, and coma after taking other medications. Some attributed it to Yin deficiency. My examination revealed deep, thready pulses in all six positions, extreme heat in hands and feet, bright red lips and tongue, and heavy body pain. I stated, "Sha toxin rushing to the Heart and causing blood stasis in the Blood level." He did not believe me. Three other physicians failed to treat him. Seeking my help again, he was unresponsive to calls and unable to rise. I administered Lengyin (Cool Tea) made from Canarium Album (Late Silkworm Sand). Then, I gave Baohua San delivered with slightly cooled Shenren Tang (Amomi Fructus Decoction). He regained slight consciousness. I then assisted him in undergoing dozens of needle releases for Sha. There was no immediate improvement. I prescribed a single dose of Taoren, Yanhusuo (Corydalis Rhizoma), Sumu, Wuyao, Honghua, Xiangfu, and Shanzha. Only then could he turn over. Later, Xiaochaihu Tang (Minor Bupleurum Decoction) eliminated chills and fever, and after two months of conditioning, he recovered.