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The chills and fever in Shanghan (Cold Damage) disease refer to alternating chills and fever. The Classics state: "When pathogenic factors and healthy Qi contend, alternating chills and fever occur." This describes the invasion of pathogenic factors, while healthy Qi fails to expel them effectively, leading to unstable Yin and Yang energies that move in and out. Consequently, chills and fever alternate. Therefore, alternating chills and fever belong to the Shaoyang (Half-Exterior, Half-Interior) syndrome. If pathogenic factors are predominantly in the Exterior, chills will be prominent; if they penetrate deeply, fever will be prominent.

The *Huoren Shu* (Book for Saving Lives) states: Alternating chills and fever result from the mutual overcoming of Yin and Yang. Insufficiency of Yang leads to chills first, followed by fever; insufficiency of Yin leads to fever first, followed by chills.

Zhang Zhongjing stated: When blood is deficient and Qi is weak, the interstices (*Couli*) open, allowing pathogenic factors to enter and contend with healthy Qi, resulting in alternating chills and fever that occur at regular intervals. This should be treated with Xiaochaihu Tang (Minor Bupleurum Decoction).

Furthermore, if after ten-plus days of Shanghan, heat accumulates internally causing alternating chills and fever, Dachaihu Tang (Major Bupleurum Decoction) should be used.

If after five or six days of Shanghan, sweating has already been applied, followed by purgation, leading to chest and abdominal fullness... [Note: Original text contains gaps/omissions here].

A medical rhyme states: "Heat more than chills belongs to the Bladder channel; if there is no vomiting and bowel movements are normal, Qingban Tang may be used. If the Chi pulse is slow, it indicates blood deficiency; if all pulses are weak and faint, it is called 'No-Yang' syndrome."

Heat more than chills belongs to Yang syndromes... [Note: Original text contains gaps/omissions here].

Regarding the discussion on residual chills and fever and their pulses after sweating: If aversion to cold is observed, warming methods should be employed. A deep and forceful pulse indicates pathogenic factors in the Interior, requiring purgation; a floating pulse indicates pathogenic factors in the Exterior, requiring diaphoresis. If Fengwen (Wind-Warmth) is mistakenly treated with diaphoresis, it will cause irritability and heat.

Chills and fever appearing after sweating indicate that pathogenic factors have not been completely resolved. A floating and洪 (Hong/Large) pulse suggests the pathogen remains in the Taiyang (Greater Yang) channel, warranting repeated diaphoresis. A deep and forceful pulse suggests the pathogen is in the Yangming (Yang Brightness) channel, requiring purgation. If residual heat in the Jueyin (Terminal Yin) channel is accompanied by diarrhea, cold extremities, and aversion to cold, Sini Tang (Frigid Extremities Decoction) should be used to warm and dispel cold without doubt.

Aversion to cold belongs to Jueyin channel pathology. If heavy sweating occurs but fever persists, accompanied by tendon constraint and body pain: if the body feels cold, it is a deficiency pattern, treated with Shaoyao Gancao Fuzi Tang (Peony, Licorice, and Aconite Decoction); if the body feels hot, it is an excess pattern, treated with Dachengqi Tang (Major Order the Qi Decoction).

A floating and Hong pulse belongs to the Taiyang channel. For chills and fever after sweating, Guizhi Er Mahuang Yi Tang (Cinnamon Twig Twice, Ephedra Once Decoction) can be used.

Fengwen (Wind-Warmth) does not present with aversion to cold. If mistakenly treated with diaphoresis, it will inevitably cause mental restlessness, thirst, and solitary muttering, treated with Weirui Tang (Polygonatum Decoction).

In patients with Fengwen, if heavy sweating leads to high fever and a restless pulse, this is named "Yin-Jiao" (Intersection of Yin and Yang), which is incurable. If after a febrile disease sweating occurs but the pulse remains restless and rapid, it is also incurable. See the entry on "Yin-Jiao" for details. The text mentions formulas for repeated diaphoresis and purgation.