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In the diagnosis and treatment of Shanghan (Cold Damage), one must first clearly distinguish between exterior/interior and cold/heat patterns. There are exterior cold patterns, interior cold patterns, exterior-interior both cold patterns, exterior heat patterns, interior heat patterns, exterior-interior both heat patterns, exterior cold with interior heat patterns, exterior heat with interior cold patterns, interior true heat with exterior false cold patterns, and interior true cold with exterior false heat patterns. Manifestations on the exterior are easy to understand, while those hidden in the interior are difficult to differentiate. True cold and true heat are easy to identify, whereas false cold and false heat are difficult to discern. Now, let us briefly outline the key points for analysis.

Symptoms such as headache, feverish body, aversion to cold and wind, stiffness of the neck and lower back, and vexatious pain in the joints all belong to the Exterior Cold pattern. All these should be resolved through diaphoresis (sweating). This corresponds to what is stated in the *Neijing* (Inner Canon): "The body feels like burning charcoal; once sweat is produced, the pathogen dissipates." However, one must distinguish between anhidrosis (no sweat) and diaphoresis (spontaneous sweating). In cases of anhidrosis, cold is more severe than wind, constituting Zheng Shanghan (True Cold Damage). It is necessary to induce profuse whole-body sweating to resolve it. The primary formula is Suqiang Dabiao Decoction, modified according to symptoms. In cases of spontaneous sweating, wind is heavier than cold, constitling Leng Shangfeng (Cold Wind Injury). This is invariably accompanied by nasal congestion, heavy voice, coughing, and sneezing. Only mild sweating is required for resolution. The primary formula is Suqiang Dabiao Decoction minus Qianghuo (Notopterygii Rhizoma et Radix) and Shengjiang (Zingiberis Rhizoma Recens), plus Jingjie (Schizonepetae Herba), Qianhu (Peucedani Radix), and Jiegeng (Platycodonis Radix). If fever and aversion to cold occur like malaria, two or three times a day, and the patient does not vomit, it remains a Taiyang Exterior pattern, treated with Suqiang Dabiao Decoction. However, if chills cease followed by fever, and fever ceases followed by sweating, this indicates the alternating chills and fever of Shaoyang disease. Symptoms often include vertigo, deafness, bitter taste in the mouth, propensity to vomit, fullness in the chest and diaphragm, and hypochondriac pain. One must ensure the free flow of Qi in the Upper Jiao, the descent of body fluids, and the harmonization of Stomach Qi, leading to gentle sweating and recovery. This is called Harmonization. For mild cases, Chaihu Zhijie Decoction is selected; for severe cases, Chaihu Xiantong Decoction is used. If during chills there is body pain and anhidrosis, and during fever there is thirst and aversion to heat, indicating that the Taiyang exterior pattern has not yet resolved but the Yangming interior pattern has become urgent, this is a severe form of Shaoyang alternating chills and fever, treated with Chaiqin Shuangjie Decoction. If there is fever, slight aversion to cold, anhidrosis, slight wheezing, pain in the forehead and eyes, and vexatious muscle pain, this indicates that Wind-Cold has invaded the muscles of the Yangming channel from the skin and hair pores. Diaphoresis is still appropriate, using Suqiang Dabiao Decoction minus Qianghuo, plus Congbai (Allii Fistulosi Bulbus) and Chidouchi (Fermented Soybean). In summary, wherever there is one part of aversion to cold, there is one part of exterior pattern. Although there are differences between profuse and mild sweating, they all aim at resolution through sweating. Taiyang diseases are treated with Exterior-Releasing methods, Shaoyang diseases with Harmonization methods, and Yangming diseases with Muscle-Resolving methods; the underlying principle is the same.