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Taiyang disease (Disease of the Taiyang channel) for two days should not involve restlessness, yet restlessness occurs. If the back is ironed to force sweating, causing profuse perspiration, the pathogenic fire enters the Stomach, depleting stomach fluids. The patient will experience irritability and likely develop delirious speech (Zhenyu). After more than ten days, if chills occur followed by spontaneous diarrhea, this indicates the impending resolution of the disease. Therefore, if sweating is confined only above the waist, with no sweat below, accompanied by difficulty urinating, vomiting, incontinence, aversion to wind at the soles of the feet, hard stools, a rapid pulse that is actually not fast, and sudden headache upon defecation, it is because the grain qi flows downward, causing heat in the soles of the feet.

In early Taiyang disease, the skin and hair are affected, causing exterior constraint and heat, while interior heat is absent. Restlessness appears only after exterior heat transmits to the Stomach over time. At day two, when the pathogen just enters the Yangming stage, restlessness should not occur; its occurrence suggests inherent excess of Stomach Yang. Instead of using cooling methods, ironing the back causes profuse sweating. Fire rises following dryness, pathogenic heat enters the Stomach, depleting fluids, leading to irritability. Dry-heat steams the Heart Spirit, causing delirium. If, after ten-plus days, slight Yin recovers internally, sudden chills and spontaneous diarrhea indicate the downward discharge of Stomach heat, signaling resolution. During ironing, heat steams upward, leaving the lower body cold, hence no sweat below the waist. Exterior cold constrains interior heat, obstructing Bladder Qi transformation, causing urinary retention. Yang Qi ascends without root, losing Bladder control, leading to incontinence. Although frequent urination is desired, urine output is low due to fluid depletion. Dehydrated fluids lead to hard stools and intestinal blockage, preventing Stomach heat from descending, causing rebellious Qi and vomiting. Fire rebels upward, causing cold feet and aversion to wind. Once chills, diarrhea, and bowel movement occur, Grain Qi circulates freely. Headache resolves as fire dissipates upward, and foot warmth indicates Yang descending. Stomach dry-heat is resolved because Grain Qi flows downward via bowel movement. The headache after bowel movement resembles a blocked furnace: once cleared, fire flares upward.

If Taiyang disease is treated with moxibustion or fumigation without inducing sweat, the patient becomes restless. If unresolved by the end of the meridian cycle, heat injures the Blood level, causing bleeding, known as "Fire Pathogen" (Qing refers to purging/bleeding).
Taiyang disease should be treated with diaphoresis. Using fire fumigation without sweating increases interior heat, causing restlessness. When the meridian cycle ends without resolution, heat injures the blood level, causing hematochezia, known as "Fire Pathogen."

A floating pulse indicates treatment with diaphoresis. Using moxibustion prevents pathogen exit and exacerbates the condition due to fire, causing heaviness and numbness below the waist, known as "Fire Reversal" (Huo Ni).
A floating pulse requires diaphoresis. Using moxibustion traps the pathogen and intensifies the disease with external fire, causing heavy obstruction and bi-syndrome below the waist, known as "Fire Reversal."