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Liu Cangshi of Taikang suffered from infrequent small-volume bowel movements, defecating seventy to eighty times a day. For over ten years, he often hung half a gourd between his thighs to catch the leakage. Dai Ren (Zhang Congzheng) saw this and laughed, saying, "Since the defecation is frequent but scanty, it indicates an attempt at unblocking that fails to achieve true patency. Why not use strong purgatives? This applies the principle of 'treating obstruction with unblocking methods' (Tong Yin Tong Yong)." With just one dose, he administered a purgative, causing more than thirty episodes of severe diarrhea, after which the symptoms ceased immediately.

The father of Yin Fu, in his sixties, suffered from summerheat-induced diarrhea, defecating fifty to sixty times a day. His family traveled from Zijun Town to Chenzhou to invite Dai Ren for treatment. The patient enjoyed drinking alcohol, and his two sons strongly advised against it. Dai Ren said, "In summer, for an elderly person whose body fluids are depleted, how can water intake be prohibited? One should only advise moderate consumption." When prescribing medication, he first instructed them to return home quickly. He had them boil green beans and more than ten chicken eggs together; once the eggs were cooked, they were removed, leaving the beans soft. Old japonica rice was added to make a thin porridge, which was stirred and consumed along with the eggs. After one or two meals, the illness reduced by more than half. This is because both japonica rice and chicken eggs can alleviate dysentery. Subsequently, formulas to suppress fire and drain dampness were prepared, and after proper regulation, he recovered.

Magistrate Xiao suffered from abdominal distension, edema of the face and feet, yellow phlegm with rapid breathing, and reduced appetite. Over three years, physicians exhausted their methods without success. Dai Ren used Gou Ti San (Melon Stalk Powder) to induce vomiting, expelling three to five sheng of cold phlegm. Then, using Zhou Che Wan (Boat Cart Pill) and Jun Chuan San (River Clearing Powder), he induced purgation, emptying jars full of green and yellow saliva and foam. Finally, he regulated the condition with Gui Ling Bai Zhu San (Cinnamon Twig, Poria, and Atractylodes Macrocephala Powder) and Wu Ling San (Five-Ingredient Powder with Poria), and within half a month, his health was restored.

Merchant Liang from Yancheng, in his sixties, suddenly felt numbness in his left fingers while combing his hair in the morning. Soon, half of his arm became numb, then the other arm, and shortly after, half of his head. By the time he finished combing, numbness extended from his hypochondrium to his feet, accompanied by constipation for two to three days. Other physicians diagnosed it as wind-stroke. Neither herbal medicine nor acupuncture provided relief. Seeking Dai Ren's treatment, Dai Ren observed that the pulses on the left hand were all hidden (Fu pulse) and smaller than those on the right by three times, indicating dryness and涩 (astringency/obstruction). He stated that this could not be attributed solely to wind but also involved fire and dryness. He prescribed emesis, purgation, and diaphoresis simultaneously, and the numbness disappeared immediately. Later, he used acrid-cooling formulas for regulation and moistening-dryness formulas for nourishment. Only the little finger and ring finger remained slightly numb. Dai Ren said, "The root cause has been eliminated; this is merely residual effect. Now acupuncture at the Xi Gu (valleys/cavities) points is appropriate." Xi Gu refers to bone cavities. On a clear day, he performed acupuncture using the "Chicken Foot Method" from the *Ling Shu*. The needle was inserted horizontally upward, advanced three times and withdrawn three times, then lifted vertically, and re-inserted horizontally downward into the fingertips. The hand became hot like fire, and the numbness completely vanished. Liu Hejian, in his work *Yuan Bing Shi* (Original Treatise on Disease Causes), often categorized numbness and astringency under the category of Dryness. He truly understood the pathogenesis.