Taiyang disease (disease of the Taiyang channel) occurring on the second or third day, if no Yangming (disease of the Yangming channel/fu-organ) or Shaoyang (disease of the Shaoyang channel/gallbladder) syndromes are observed, indicates that the pathogen has not transmitted.

In the first day of Taiyang disease, the Taiyang channel is affected; on the second day, the Yangming channel; and on the third day, the Shaoyang channel. This is a fixed rule. By the second and third days, logic dictates the pathogen should transmit to Yangming or Shaoyang. If there are no interior syndromes of Yangming or Shaoyang at this time, it means the pathogen has only transmitted to the meridians of the Three Yang channels but has not entered the Fu-organs of Yangming.

Yangming diseases are all Fu-organ diseases, not Meridian diseases. Therefore, it is stated: "The essence of Yangming disease is the excess condition of the Stomach family" (Wei Jia Shi). Once the "Stomach family" becomes excessive, the pathogen resides in the Fu-organ and remains there without shifting. Although the pathogen may pass through the Three Yin channels, it will not re-enter the Zang-organs of the Three Yin. This is referred to as "Yangming, the central earth, is the destination for all things, with nowhere else to transmit," because Yang energy reaches its peak while Yin recedes. As for the Ge Gen Tang (Kudzu Decoction) syndrome, it represents a Fu-organ disease affecting the meridian, where Stomach heat has not yet become excessive. Even the Gui Zhi Tang (Cinnamon Twig Decoction) and Ma Huang Tang (Ephedra Decoction) syndromes belong to Yangming Meridian diseases and have not yet formed the excessive Fu-organ disease characterized by Yang excess. In the second and third days, the absence of the "excess condition of the Stomach family" in Yangming indicates that transmission to the Yangming Fu-organ has not occurred.

Shaoyang diseases, such as those treated with Xiao Chai Hu Tang (Minor Bupleurum Decoction), involve organ-pathology affecting the meridians and are not merely meridian diseases. This is due to the constraint and pressure between the interior and exterior of the organs and meridians. Consequently, syndromes associated with Chai Hu (Bupleuri Radix) may persist for eight or nine days, or even thirteen days, sometimes exceeding ten days after the completion of the meridian cycle. If the pathogen were confined solely to the meridians without involving the organs, one would expect Shaoyang meridian symptoms on the third day, Taiyin meridian symptoms on the fourth day, Shaoyin meridian symptoms on the fifth day, and resolution through sweating by the sixth day when the meridian cycle completes. How could Shaoyang syndromes persist so long without receding? Even the Ma Huang Tang syndrome is a Shaoyang meridian disease that has not yet formed an interior syndrome connecting to the organs. The absence of Xiao Chai Hu Tang syndromes in the second and third days also signifies that transmission to the relevant deep-seated pathology has not occurred.

On the first day of Taiyang disease, if the pulse is calm, it indicates no transmission. However, if the patient frequently desires to vomit, experiences irritability, and the pulse is rapid and urgent, it indicates transmission.

A floating and tight pulse cannot be considered calm. If the pulse were calm, it would indicate that the pathogen will not transmit inward. If meridian pathogens cause constraint upon the Yangming and Shaoyang meridians, leading to rebellious Stomach Qi and frequent vomiting, along with irritability and a rapid, urgent pulse, this signifies severe external pathogen constraint and extreme stagnation of meridian Qi. Such conditions inevitably lead to internal transmission.

When Taiyang meridian disease occurs, if the interior Qi is harmonious and Yang does not prevail excessively, it will not transmit internally to the Fu-organs; if Yin does not prevail excessively, it will not transmit internally to the Zang-organs. On the first day of Taiyang disease, a calm pulse indicates no transmission, specifically meaning no transmission to the Zang and Fu-organs, not that there is no transmission among the Six Channels. Master Cheng argued that Warm Diseases transmit through channels while Cold Damage does not. If Cold Damage truly did not transmit, then on the first day, with the pathogen in Taiyang and a calm pulse, the disease would resolve via sweating on the same day. Since it is Cold Damage, how could it resolve on the first day? Without resolving through sweating, given that the Six Channels are sequentially connected, how could Taiyang disease remain isolated in one channel without transmitting to adjacent ones? Claims that the disease stays in Taiyang for several days before passing Yangming are disjointed and illogical. Others suggest transmission from Taiyang to Yangming or from Taiyang to Shaoyang. Since Yangming lies between Taiyang and Shaoyang, if transmission passes Yangming to reach Shaoyang, why would Yangming not manifest disease? If Yangming is bypassed, how can the pathogen reach Shaoyang? The later theory of "Direct Invasion into the Yin Channels" proposed by ignorant and presumptuous individuals ignores that the Three Yang channels are superficial; thus, it is impossible to bypass the Three Yang channels to directly invade the Yin channels. These are mere nonsensical ramblings of the foolish and do not warrant serious refutation.