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Taiyang disease (Disease of the Taiyang channel) progresses deeply, with exterior symptoms still present. Heat accumulates in the Lower Jiao (Lower Burner) along the channel. The pulse is faint and deep. If there is no chest binding syndrome but madness occurs, it indicates heat in the Lower Jiao; the lower abdomen should be hard and full, and urination is spontaneous and free. If blood flows downward, the disease will heal; attacking methods are suitable. Alternatively, in Taiyang disease, if the body is yellow and the pulse is deep, it indicates heat accumulating in the Lower Jiao along the channel. Hardness of the lower abdomen with difficulty in urination indicates no blood stasis; spontaneous urination with a state resembling madness indicates blood stasis syndrome. Alternatively, if Yangming channel heat accumulation is severe internally, leading to forgetfulness or madness, although the stool is hard, it is surprisingly easy to pass and black in color, this indicates blood accumulation. Or, without exterior or interior symptoms, only with fever progressing daily and a floating pulse, purgation may also be used. Or, after purgation has been performed, if the pulse is rapid, the stomach heat causes excessive hunger and digestion, and there is no bowel movement for several days, this indicates blood stasis; all these cases are suitable for treatment with Didang Tang (19) to purge. In Shanghan (Cold Damage) with heat, fullness of the lower abdomen, and spontaneous urination, this indicates blood stasis and requires purgation. However, one dares not use decoction immediately; using Didang Wan (20) is the most prudent approach. If Taiyang disease does not resolve and heat accumulates in the Lower Jiao, first use Guizhi Tang (Cinnamon Twig Decoction) to release the exterior, then treat the bleeding; Taoren Chengqi Tang (14) or Didang Wan (20) are suitable for attacking. In Wind Injury, if sweating and purgation fail to resolve the condition, heat stagnates in the channels and collaterals, surging with Qi and leaking out as epistaxis. Or, if the clear passages are blocked, heat flows into the stomach, causing vomiting of clear blood and epistaxis. If hematemesis is incomplete and residual blood remains, leading to a yellow complexion and black stool, Xijiao Dihuang Tang (Rhinoceros Horn and Rehmannia Decoction) is used. For madness, add Huangqin (Scutellariae Radix) and Dahuang (Rhei Radix et Rhizoma).

Delirium and madness are treated by purging with Sanyi Chengqi Tang (13) combined with Jiedu Tang (21). If Shanghan passes through the stages and delirium occurs, indicating existing heat, decoction should be used for purgation. If urination is free and the stool should be hard but diarrhea occurs with a harmonious pulse, it means the physician used pill-based purgatives, which is incorrect treatment. If there is spontaneous diarrhea, the pulse should be Jue (extreme/cold), but now it is harmonious; this indicates internal excess. Tiaowei Chengqi Tang (11) or Liangge San (23) can be used generally.

In Yangming disease, if exterior heat is extremely severe, causing irritability, fullness, and heat stagnation, with retained fluids failing to disperse, damp-heat intertwines, resulting in jaundice. The symptoms include sweating only on the head and no sweat on the body, stopping at the neck, difficulty in urination, and thirst for drinks. For a yellow body, Yincheng Tang (32) adjusted with Wuling San (24) is suitable. For chest binding with jaundice, half doses of Yincheng Tang and Xianxiong Tang (16) are used for purgation. Or, if hot-toxic pills were mistakenly taken for purgation, damaging Yin Qi, leading to persistent diarrhea accompanying heat; again, for chest binding with jaundice, use 5 parts Yincheng Tang, 3 parts Xianxiong Tang, and 1 part Chengqi Tang (10) for purgation. Or, for Jaundice from Two-Channel Disease (Lianggan), use Yincheng Tang added with Huanglian Jiedu Tang (21) for urgent purgation in one dose. If there is slight head sweating, free urination, and mild yellowing, it indicates mild damp-heat; Zhizi Bopi Tang (29) is used. For severe jaundice, Yincheng combined with Sanyi Chengqi Tang (13) is used.