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Taiyang disease (disease of the Taiyang channel) persists for six or seven days, with no significant heat on the exterior, yet the patient is restless and irritable. This indicates that Yang has departed [the exterior] to enter Yin, signifying a transition from a Yang syndrome to a Yin syndrome.

When Taiyang disease reaches the sixth or seventh day, which marks the completion of the meridian cycle, there is no significant heat on the exterior, but the patient experiences restlessness. This signifies that Yang Qi has departed from the exterior and entered the Yin organs (such as the Taiyin and Shaoyin). When Yin Qi within the organs becomes vigorous, Yang Qi loses its root and fails to return, inevitably leading to restlessness.

A woman suffering from Wind-stroke (a type of exogenous febrile disease caused by wind pathogen) presents with fever and aversion to cold. At this time, her menses have just begun. Seven or eight days after contracting the illness, the fever subsides, the pulse becomes slow, and the body cools down. However, she experiences fullness and distension in the chest and hypochondrium, resembling the presentation of Jie Xiong (Chest Binding), accompanied by delirium. This is Heat entering the Blood Chamber (Xue Shi). The Qimen acupoint should be needled, applying the reducing method according to the excess condition.

In a woman with Wind-stroke presenting with fever and aversion to cold, coinciding with the onset of menstruation, if seven or eight days later the fever has ceased, the pulse is slow, and the body is cool—indicating an impending resolution—if she nevertheless experiences distension and fullness below the chest and hypochondrium, similar to Chest Binding, along with delirium, this indicates Heat entering the Blood Chamber. The heat is not in the upper part but in the lower part. The Qimen acupoint of the Jueyin Liver channel should be needled to drain the excess along the channel. Since the Liver stores Blood, and the Liver and Gallbladder share the same Qi (being interior-exterior partners), this principle is consistent with the treatment involving needling Qimen described in the chapter on Yangming disease.

A woman with Wind-stroke, after seven or eight days, subsequently develops alternating chills and fever with regular periodicity, while her menses have just stopped. This is Heat entering the Blood Chamber; the blood must be congealed, causing symptoms resembling malaria with regular paroxysms. Xiao Chai Hu Tang (Minor Bupleurum Decoction) should be administered as the primary formula.

After seven or eight days of Wind-stroke, if the patient subsequently develops alternating chills and fever with regular timing, coinciding with the cessation of menstruation, this indicates Heat entering the Blood Chamber. The blood will likely become stasis-bound. Heat constrained in the blood compartment prevents the Qi mechanism of the Shaoyang channel from reaching the exterior. Yin and Yang contend and bind each other, resulting in alternating chills and fever resembling malaria with regular intervals. Xiao Chai Hu Tang disperses the pathogenic heat of the Shaoyang channel. Once the heat is cleared, the blood will flow naturally; if it does not, then Di Dang Tang (Ephedra and Ground Beetle Decoction) should be used to attack the stasis. In the previous case, Heat entered because menses had just started, representing a state of Blood Excess, suitable for clearing and draining. In this case, Heat entered because menses had just stopped, representing a state of Blood Deficiency, suitable for cooling and tonifying.

A woman with Cold Damage (Shang Han) presents with fever, coinciding with the onset of menstruation. During the day, her mind is clear and lucid; at night, she becomes delirious, seeing visions as if ghosts were present. This is Heat entering the Blood Chamber. Do not injure the Stomach Qi, nor disturb the Upper and Middle Jiao (Triple Burners); the condition will resolve spontaneously.

In a woman with Cold Damage presenting with fever, coinciding with the onset of menstruation, she is clear-minded during the day but delirious at night, seeing visions as if ghosts were present. This is Heat entering the Blood Chamber. Since Blood is Yin, and Yang Qi enters the Yin compartments at night, the heat in the Blood compartment flares up, causing delirium and confusion. As the pathogenic heat is located in the lower part, treatment must avoid violating the Stomach Qi of the Middle Jiao and the Clear Qi of the Upper Jiao; the disease will heal itself.