Taiyang (Greater Yang) channel pathogenesis presents with fever, aversion to wind, and aversion to cold. If sweating occurs, it indicates dryness and heat in the Stomach of the Yangming (Brightness Yang) organ system (if dry feces are accumulated internally, dryness manifests). If vomiting, regurgitation, neck pain, and body fever are present, the physician should consider Shaoyang (Lesser Yang) disease. (Taiyang disease requires diaphoresis; Yangming disease requires purgation; Shaoyang disease requires harmonization.)

Taiyin (Greater Yin) and Jueyin (Terminal Yin) diseases typically do not present with fever. Only Shaoyin (Lesser Yin) disease occasionally presents with fever. When Yang channels are affected by fever, the pulse is often floating and large; limbs become obstructed when warmed. When Yin channels are affected by fever, the pulse must be deep and fine; diarrhea is common, and limbs are frequently cold and reversed (Jue-ni).

If a patient remains febrile after undergoing purgation, they gradually feel a painful knot forming in the chest. Zhizi Chi Tang (Gardenia and Fermented Soybean Decoction) is most appropriate for this condition; eliminating the pathogen is as swift as snow melting in hot water.

Diseases of the Three Yang channels often involve headache; one must identify the etiology based on symptoms. Taiyang disease with aversion to cold is suitable for exterior-releasing methods; Xianghe Tang (Qianghuo and Ligusticum Decoction) should use Chuanxiong (Ligustici Rhizoma et Radix) in increased dosage. Yangming disease presenting with steaming-hot fever is best treated with Tiaowei Chengqi Tang (Regulating the Stomach and Directing Downward Decoction). Shaoyang channel disease presents with a string-taut and thin pulse; pain radiates to the temporal angle and ears, possibly accompanied by bitter taste and alternating chills and fever; the Xiao Chaihu Tang (Minor Bupleurum Decoction) syndrome becomes clear. The Three Yin channels inherently lack headaches; if headache occurs, it belongs to Jueyin pathology. Furthermore, retained phlegm can cause disturbances, leading to cold limbs and unbearable pain.

Sore throat differs significantly between Yin and Yang patterns. Swelling and pain of the throat and pharynx are attacked by heat pathogens; if the pulse is floating, scattered, and large, or accompanied by hemoptysis, medication according to the syndrome will naturally restore smoothness. Yin-toxin sore throat with throat obstruction is caused by cold pathogens lurking within the Shaoyin channel. With a weak pulse, warming and dispersing methods should be used; Banxia Guizhi Tang (Pinellia and Cinnamon Twig Decoction) serves as the vanguard, but Sini Tang (Frigid Extremities Decoction) plus Jiegeng (Platycodon Root) must be employed. Treatment must not be disordered to achieve efficacy.

The Shaoyang Gallbladder channel traverses the hypochondrium. When pathogens enter this channel, pain is severe and intolerable. Fullness and hardness below the heart radiating to the hypochondrium are effectively treated with Shizao Tang (Ten Jujube Decoction). Yangming disease presents with firm fullness, constipation, stiff neck, anorexia, and tidal fever. If this transitions into the Shaoyang channel, only Xiao Chaihu Tang yields the best results.

Abdominal fullness and pain require differentiation between Yin and Yang. For interior excess syndromes, purgation is the optimal strategy. A solid and forceful pulse indicates Yangming excess; Dachaihu Tang (Major Bupleurum Decoction) or Xiaochengqi Tang (Minor Order the Qi Decoction) may be selected. Abdominal fullness and acute pain in the Three Yang channels, if accompanied by a deep, micro, and fine pulse, indicate interior cold; Fuzi Lizhong Tang (Aconite and Magnolia Bark Regulate the Middle Decoction) and Sini Tang are indicated, and correct administration leads to recovery. Diarrhea in the Three Yin channels consisting purely of undigested food (watery diarrhea with complete retention of original grain form) indicates extreme interior deficiency; Sishen Tang (Four Miracles Decoction) is used. Intestinal borborygmus, diarrhea, and abdominal pain due to deficiency cramps are suitably treated with Xiaojianzhong Tang (Minor Establish the Middle Decoction).