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Any disease originating from *Shanghan* (Cold Damage) that transforms into a warm disease is termed "Wen" (Warm Disease) if it occurs before the Summer Solstice, and "Shu" (Summerheat Disease) if it occurs after the Summer Solstice. Summerheat pathogenic factors should be expelled along with sweat; do not forcibly stop sweating.

This passage explains that the severity of contracted pathogens varies, and the onset of disease is unpredictable in terms of timing. As mentioned above, when the Taiyang channel (Taiyang Shou Zhi, the exterior channel affected first by cold pathogens) is involved on the first day, it refers to immediate illness upon contracting the pathogen. However, if pathogens remain latent without immediate manifestation, they will transform into diseases according to the seasonal climate changes. As stated in the *Tongtian Lun*: "If harmed by cold in winter, warm diseases will inevitably occur in spring." Therefore, diseases manifesting before the Summer Solstice are called Wen, while those manifesting after are called Shu. Due to climatic variations, the diseases differ, instructing practitioners to distinguish and treat them accordingly. Since winter is characterized by cold qi and spring by warm qi, at the Summer Solstice, yang qi reaches its peak and yin qi begins to generate; earth qi rises while heaven qi descends. Thus, the warmth before the Summer Solstice belongs to yang pathogens. After the Summer Solstice, rising earth qi transforms into dampness; the combination of dampness and fire constitutes summerheat. Consequently, summerheat diseases present with spontaneous sweating, allowing dampness to dissipate externally and heat to scatter. Sweat should be allowed to flow naturally and not be suppressed. If sweating is stopped, dampness will obstruct heat, leading to severe illness. Hence, the treatment methods for summerheat and warm diseases differ.

The *Suwen: Ci Re Pian* states: In liver heat disease, urination turns yellow first, accompanied by abdominal pain, excessive sleepiness, and body fever. When heat struggles with healthy qi, delirium and惊厥 (convulsions/fright) may occur, along with distension and pain in the hypochondrium, restlessness of the hands and feet, and inability to lie down. The condition worsens on Geng-Xin days (Metal days), and profuse sweating on Jia-Yi days (Wood days) can resolve the pathogen. If qi rebellion occurs, death may ensue on Geng-Xin days. Treatment involves needling the Foot-Jueyin Liver and Foot-Shaoyang Gallbladder channels. If the pathogen rebels upward, it causes dizziness and vertigo ("Yuan Yuan," describing a spinning sensation in the head), as the pulse draws energy rushing to the head.

This clearly illustrates the syndrome of latent pathogens manifesting. Generally, pathogens entering from the exterior first present with exterior syndromes, such as fever, aversion to cold, and headache seen in Taiyang disease. The liver heat disease described here demonstrates latent pathogens transforming into heat and emerging from the interior, thus initially presenting with interior syndromes. Since the Liver governs urinary retention and incontinence (Yi Ni Long Bi), liver heat manifests first as yellow urine. Abdominal pain, lethargy, and fever occur because the Spleen resides in the abdomen and governs muscles; when the Spleen is constrained, one desires sleep, indicating that liver pathology inevitably extends to the spleen. Internal disturbance by heat disrupts the Shen (Spirit), causing delirium, fright, hypochondriac pain, and limb restlessness, which are manifestations of the Heart and Liver meridians due to the affinity between Wood (Liver) and Fire (Heart). The Gallbladder corresponds to Jia Wood, and the Liver to Yi Wood; therefore, on Jia-Yi days when Wood qi is prosperous, profuse sweating resolves the pathogen. Geng-Xin correspond to Metal, which controls Wood; thus, the condition worsens on these days. If healthy qi fails to overcome the pathogen and qi rebels, Wood qi perishes on Geng-Xin days, leading to death. Needling the Foot-Jueyin Liver and Foot-Shaoyang Gallbladder channels drains the pathogen. If the pathogen rebels upward, it causes vertigo and a sensation of the head spinning, as the pulse draws force to the head. This is because the Liver meridian circulates behind the throat and ascends to the vertex.