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1. In the treatment of Shanghan (Cold Damage), one must directly attack and purge the pathogenic toxins; tonification methods should not be used. This is because when the pathogenic factor resides in the meridians, timely purging according to symptoms allows for recovery in only three to four days. Conversely, if tonifying herbs are administered, the toxins will become rampant and spread, leading to a critical and perilous condition.

2. If a patient with Shanghan presents with mental confusion but still has unobstructed urination, this indicates that the Yin Qi (Vital Energy associated with Yin) has not yet been exhausted, and the condition remains treatable.

3. When a Shanghan patient loses their appetite, one must absolutely avoid using herbs that warm the Spleen and strengthen the Stomach, as this may exacerbate heat toxins and cause significant harm. Once the pathogenic factor is eliminated and the interior harmonizes, appetite will naturally return.

4. Among cases of Shanghan and Wenyi (Warm Epidemic diseases), those that are incurable or difficult to treat invariably belong to patterns of deficiency in the Lower Yuan (Lower Origin/Kidney essence). For instance, in cases of household transmission, family members suffer from daily anxiety due to the illness, leading to reduced food intake. This reduction causes Qi deficiency. Proximity to the sick person allows the pathogenic Qi to enter through the mouth and nose. Therefore, treatment should focus on clearing the Yangming channel, relieving stagnation, and addressing exhaustion. Mistaking excess for deficiency causes little harm; however, mistaking deficiency for excess leads immediately to collapse and danger.

5. In Shanghan, when deficient heat blazes internally and the fluids in the Stomach are dried up, only herbs with sweet and cold properties can harmonize the condition. However, the dosage in the prescription should be small, and administration should be frequent. Just as an extremely hungry person must be fed gradually, the medicine should be administered frequently throughout the day and night, five or six doses, employing a method akin to "soaking" or "irrigating." This allows the pathogenic heat to resolve gradually and the Original Qi (Yuan Qi) to regenerate. If the dose is reduced and the interval between administrations lengthened, it will be too late.

6. Spontaneous diarrhea in Shanghan must be differentiated into Yin and Yang syndromes. One must absolutely avoid indiscriminately administering tonifying, warming, or antidiarrheal drugs, as this can be fatal. Only spontaneous diarrhea accompanied by a lack of body heat, where the hands remain warm, belongs to the Taiyin syndrome. Body coldness with cold limbs (Jue Ni) belongs to Shaoyin or Jueyin syndromes. All other cases of diarrhea accompanied by body heat belong to Yang syndromes.

7. Whenever exposure to rain and dampness causes dampness to invade internally and stagnate in the chest region, the treatment should solely involve drying dampness and harmonizing the middle Jiao. If mistaken for a case requiring purgation, the dampness will descend, damaging the Spleen and Stomach, inevitably transforming into dysentery. Over time, blood may appear in the stool, known colloquially as "Five-Color Dysentery," progressing to cold limbs, flaccid paralysis of hands and feet, lethargy, deep and faint pulses at the Cun, Guan, and Chi positions, and uncontrollable incontinence. In men, this is termed Wang Yang (Collapse of Yang); in children, it is called Man Pi Feng (Slow Spleen Wind).

8. In Shanghan and Wenyi, Yangming syndromes often accompany the Three Yang syndromes. This is because the Hand-Yangming Large Intestine Meridian governs the Large Intestine and forms an exterior-interior relationship with the Lung, both opening into the nose. The Foot-Yangming Stomach Meridian governs the Stomach and forms an exterior-interior relationship with the Spleen, both opening into the mouth. Since pathogenic factors always enter through the mouth and nose, Yangming syndromes are observed particularly frequently.