He Tingfang suffered from a cold-damage disease. After taking exterior-dispersing medicine, symptoms such as headache, body pain, fever, and aversion to cold were relieved, indicating that the exterior pathogen had been resolved. However, difficulties in urination and defecation, as well as excessive phlegm and saliva during coughing, persisted. The physician, failing to discern the condition, adhered to the cold-damage method, which suggests that once the exterior pathogen is resolved, internal pathogens can be purged. Mistakenly prescribing Chengqi Decoction led to abdominal distension, vomiting, and abnormal rising of qi. Upon re-examination, the previous physician was alarmed and withdrew. Observing that the patient was not thirsty, had no fever, and exhibited a wiry and slippery pulse, I concluded that there was no pathogenic heat or solid accumulation internally. Instead, phlegm-fluid retention obstructed the stomach and intestines. The bitter and cold nature of Chengqi Decoction only damaged stomach qi, disrupting its transmission and transformation, causing dampness to stagnate and phlegm-fluid retention to worsen, thereby further disturbing stomach qi and increasing distension. I prescribed Five Ingredients with Poria Powder, emphasizing cinnamon to transform qi and drain dampness, and added dried tangerine peel and Gansui root to harmonize the middle and expel fluids. After one dose, both urination and defecation improved, and the patient immediately felt refreshed. No further doses were needed for recovery. This was because qi transformation allowed dampness to disperse, and in the mechanism of the disease, difficulty in urination was the urgent symptom to address.