伤寒一日，太阳受病，太阳者，膀胱之经也，为三阳之首，故先受病。其脉络于腰脊，
主于头项。故得病一日，而头项背膊腰脊痛也。
伤寒二日，阳明受病。阳明者，胃之经也，主于肌肉，其脉络鼻入目。故得病二日，肉
热鼻干，不得眠也。诸阳在表，表始受病，在皮肤之间，可摩膏、火炙，发汗而愈。
伤寒三日，少阳受病。少阳者，胆之经也，其脉循于胁，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，故皆可汗而解。
伤寒四日，太阴受病。太阴者，脾之经也，为三阴之首。是故三日以前，阳受病讫，传
之于阴，而太阴受病焉。其脉络于脾，主于喉嗌。故得病四日，腹满而嗌干也。其病在胸膈
，故可吐而愈。
伤寒五日，少阴受病。少阴者，肾之经也，其脉贯肾络肺，系于舌。故得病五日，口热
舌干，渴而引饮也。其病在腹，故可下而愈。
伤寒六日，厥阴受病。厥阴者，肝之经也，其脉循阴器，络于肝。故得病六日，烦满而
囊缩也。此则阴阳俱受病，毒瓦斯在胃，故可下而愈。
伤寒第一天，太阳经受邪。太阳经，即膀胱的经脉，是三阳经的首位，所以最先受病。它的脉络连接腰部和脊柱，主管头部和项部。因此患病第一天，会出现头、项、背膊、腰脊疼痛的症状。
伤寒第二天，阳明经受邪。阳明经，即胃的经脉，主管肌肉，其脉络从鼻进入眼睛。因此患病第二天，会出现肌肉发热、鼻干、无法安睡的症状。诸阳经在体表，体表刚开始受病，病位在皮肤之间，可以通过涂抹药膏、火灸等方法，发汗而痊愈。
伤寒第三天，少阳经受邪。少阳经，即胆的经脉，其脉循行于胁肋，上行至颈部和耳部。因此患病第三天，会出现胸胁发热和耳聋的症状。三阳经的经络开始相互传变，但病邪尚未传入内脏，所以都可以通过发汗的方法解除。
伤寒第四天，太阴经受邪。太阴经，即脾的经脉，是三阴经的首位。所以前三天阳经受病完毕后，病邪传至阴经，太阴经受邪。它的脉络连接脾脏，主管咽喉。因此患病第四天，会出现腹部胀满和咽喉干燥的症状。病邪位于胸膈部位，所以可以通过催吐的方法痊愈。
伤寒第五天，少阴经受邪。少阴经，即肾的经脉，其脉贯穿肾脏并联络肺脏，系连于舌。因此患病第五天，会出现口热、舌干、口渴想喝水的症状。病邪位于腹部，所以可以通过泻下的方法痊愈。
伤寒第六天，厥阴经受邪。厥阴经，即肝脏的经脉，其脉循行于生殖器，联络于肝脏。因此患病第六天，会出现心烦胀满和阴囊收缩的症状。此时阴阳两经都受病，毒邪在胃中，所以可以通过泻下的方法痊愈。
伤寒第七天，病情应当有所减轻，因为阴阳各经的病邪传变已经结束了。如果七天后，病情反而加重，这是将要发生“再经病”（病邪再次传遍一经）的表现。“再经病”，是指阴阳各经的经络再次受到病邪侵袭。
伤寒第八天，如果病仍未解，可能是因为阴阳各经的经络再次受病，或者是因为在发汗、催吐、泻下之后，体内的毒邪尚未清除干净，所以病症仍然存在。
On the first day of *Shanghan* (Cold Damage), the Taiyang channel is affected. The Taiyang channel is the meridian of the Bladder, and it is the head of the Three Yang channels; therefore, it is affected first. Its collaterals connect to the waist and spine, and it governs the head and neck. Thus, on the first day of illness, pain occurs in the head, neck, back, shoulders, waist, and spine.
On the second day, the Yangming channel is affected. The Yangming channel is the meridian of the Stomach, which governs the muscles; its collaterals enter the nose and reach the eyes. Thus, on the second day, there is heat in the muscles, dryness of the nose, and inability to sleep. Since the Yang channels are at the exterior, and the exterior has just been affected with the pathogen located between the skin and flesh, one may apply ointments or use moxibustion to induce sweating for recovery.
On the third day, the Shaoyang channel is affected. The Shaoyang channel is the meridian of the Gallbladder; its vessel runs along the hypochondrium and ascends to the neck and ears. Thus, on the third day, there is heat in the chest and hypochondrium, and deafness. The meridians of the Three Yang channels begin to transmit the disease sequentially, but the pathogen has not yet entered the Zang organs; therefore, all can be resolved by inducing sweating.
On the fourth day, the Taiyin channel is affected. The Taiyin channel is the meridian of the Spleen, and it is the head of the Three Yin channels. Thus, after the Yang channels have completed their cycle of receiving the pathogen in the previous three days, the transmission moves to the Yin channels, and the Taiyin channel is affected. Its collaterals connect to the Spleen and govern the throat. Thus, on the fourth day, there is abdominal fullness and dryness of the throat. Since the disease is located in the chest and diaphragm, it can be cured by emesis.
On the fifth day, the Shaoyin channel is affected. The Shaoyin channel is the meridian of the Kidney; its vessel passes through the Kidney, connects to the Lung, and is linked to the tongue. Thus, on the fifth day, there is heat in the mouth, dryness of the tongue, thirst, and a desire to drink. Since the disease is located in the abdomen, it can be cured by purgation.
On the sixth day, the Jueyin channel is affected. The Jueyin channel is the meridian of the Liver; its vessel runs along the genitalia and connects to the Liver. Thus, on the sixth day, there is vexation and fullness, and contraction of the scrotum. At this point, both Yin and Yang channels are affected, and toxic pathogens reside in the Stomach; therefore, it can be cured by purgation.
On the seventh day, the condition should improve slightly, because the transmission of disease through the Yin and Yang channels has concluded. If, after seven days, the condition worsens instead, it indicates the onset of "Re-Jing Bing" (disease re-entering a channel). "Re-Jing Bing" occurs when the meridians of the Yin and Yang channels are affected again.
On the eighth day, if the disease does not resolve, it may be because the meridians of the Yin and Yang channels have been affected repeatedly, or because the toxic pathogens were not fully cleared after treatment with sweating, emesis, or purgation; thus, symptoms persist.