时气病一日，太阳受病，太阳为三阳之首，主于头项，故得病一日，头项腰脊痛。
时气病二日，阳明受病。阳明主于肌肉，其脉络鼻入目，故得病二日，肉热，鼻干不得
眠。夫诸阳在表，始受病，故可摩膏火炙，发汗而愈。
时气病三日，少阳受病。少阳脉循于胁，上于颈耳，故得病三日，胸胁热而耳聋也。三
阳经络始相传病，未入于脏，故可汗而愈。
时气病四日，太阴受病。太阴为三阴之首。三日以后，诸阳受病讫，即传之于阴。太阴
之脉，络于脾，主于喉嗌，故得病四日，腹满而嗌干。其病在胸膈，故可吐而愈也。
时气病五日，少阴受病。少阴脉贯肾络肺系于舌，故得病五日，口热舌干而引饮
。其病在腹，故可下而愈。
时气病六日，厥阴受病。厥阴脉循阴器络于肝，故得病六日，烦满而阴缩。此为三阴三
阳俱受病，毒瓦斯入于肠胃，故可下而愈。
时气病七日，法当小愈，所以然者，阴阳诸经传病竟故也。今病不除者，欲为再经病也
。再经病者，谓经络重受病也。
时气病八、九日以上不解者，或者诸经络重受于病；或已发汗、吐、下之后，毒瓦斯未尽
，所以病不能除；或一经受病，未即相传，致使停滞累日，病证不改者，故皆当察其证候而
夫得病四日，毒在胸膈，故宜取吐。有得病二、三日，便心胸烦满，此为毒瓦斯已入。或
有五、六日以上，毒瓦斯犹在上焦者，其人有痰实故也，所以复宜取吐也。
On the first day of a seasonal pathogenic disease (Shi Qi Bing), the Taiyang channel (Greater Yang channel) is affected. As the head of the three Yang channels, it governs the head and neck; therefore, on the first day, pain in the head, neck, waist, and spine occurs.
On the second day, the Yangming channel (Bright Yang channel) is affected. The Yangming channel governs the muscles, and its collaterals connect to the nose and enter the eyes; therefore, on the second day, heat in the flesh, dryness of the nose, and insomnia occur. When yang channels are initially affected at the exterior, one may apply medicated ointments or use moxibustion/fire therapy to induce sweating for recovery.
On the third day, the Shaoyang channel (Lesser Yang channel) is affected. The Shaoyang channel follows the hypochondrium and ascends to the neck and ears; therefore, on the third day, heat in the chest and hypochondrium and deafness occur. The meridians of the three Yang channels begin to transmit the disease among themselves, but it has not yet entered the zang organs; thus, it can be cured by inducing sweating.
On the fourth day, the Taiyin channel (Greater Yin channel) is affected. The Taiyin channel is the head of the three Yin channels. After three days, once all yang channels have been affected, the disease transmits to the yin channels. The Taiyin channel connects with the spleen and governs the throat; therefore, on the fourth day, abdominal fullness and dryness of the throat occur. Since the disease is located in the chest and diaphragm, it can be cured by emesis (inducing vomiting).
On the fifth day, the Shaoyin channel (Lesser Yin channel) is affected. The Shaoyin channel passes through the kidney, connects with the lung, and links to the root of the tongue; therefore, on the fifth day, heat in the mouth, dryness of the tongue, and a desire to drink water occur. Since the disease is located in the abdomen, it can be cured by purgation (drastic downward draining).
On the sixth day, the Jueyin channel (Terminal Yin channel) is affected. The Jueyin channel follows the genitalia and connects with the liver; therefore, on the sixth day, irritability, fullness, and contraction of the genitals occur. At this point, the three Yin and three Yang channels are all affected, and toxic vapors have entered the stomach and intestines; thus, it can be cured by purgation.
On the seventh day, according to the law, the condition should slightly improve. This is because the transmission of disease through the yin and yang channels has concluded. If the disease persists, it indicates a "re-entering channel" disease (Zai Jing Bing). A re-entering channel disease refers to the meridians being affected again.
If the seasonal pathogenic disease does not resolve after the eighth or ninth day, it may be due to: the various meridians being affected repeatedly; or toxic vapors remaining uneliminated after prior treatment with sweating, emesis, or purgation; or the disease stagnating in one channel without immediate transmission, causing symptoms to remain unchanged for several days. In all such cases, one must carefully observe the signs and symptoms...
Regarding the fourth day, when the toxin is in the chest and diaphragm, emesis is appropriate. For those who experience chest and heart irritability and fullness on the second or third day, it is because the toxic vapors have already entered. For those whose illness has lasted five or six days or more, yet the toxic vapors remain in the upper jiao (Upper Burner), this is due to the presence of phlegm-solidity in the patient; therefore, emesis is also appropriate.