這位42歲的男性患者來診時主訴近兩週來經常於夜間發燒38度，由夜間10點持續至淩晨2~3點，伴隨有畏冷，全身關節肌肉酸痛等症狀。望診症見兩面頰略紅，問診發現病患有胃潰瘍病史。平素晚睡，易緊張，嗜飲冰水，飲食口味重，發病前一個月連續熬夜工作，常感睡眠不足。之後又因家中遭竊，常覺心神不寧。精神緊繃。食欲不佳，容易腹瀉。午後容易咽乾失聲。切診得脈沉無力右關稍滑尺弱左脈細澀。中醫辨證爲脾胃虛陷、陰火上亢，治則補氣昇陽瀉火，處方爲補脾胃瀉陰火昇陽湯加減。服藥一週。回診時自訴已無發熱諸症，惟過勞後仍易發頭痛，緊張時仍易便溏。依前方加減再服一週，症狀均明顯善。後續以補氣養陰類方藥鞏固療效，持續追蹤至今。李東垣脾胃論的元氣陰火學說爲此病患的診療用藥思路提供重要的指導，並取得滿意的臨床療效。

The 42-year-old male came to our outpatient department and complained of the continuous relapsing fever up to 38 degree for about two weeks. The fever arised usually at 10 PM and subsided at 2 AM, accompanying with cold and generalized skeletomuscular soreness. Inspection demonstrated the patient's flushing cheeks, and revealed the history of gastric ulcer, habits of staying up late, easily getting nervous, favoring cold drinks and heavy food taster. One month ago before the disease occurrence, he stayed up late working and had poor sleep. After his home burglary, he was usually anxious and stressed, and had poor appetite, diarrhea easily, and afternoon hoarseness with a dry throat. The pulse is deep and weak, with somewhat slippery on the right bar and weak on the right cubit area, and the left pulse is fine and rough. According to those above evidence, the traditional Chinese pattern Identification is "vacuity fall of the spleen and stomach" and "ascending hyperactivity of yin fire". The principle of treatment is "boosting qi, elevating yang and drain fire". The prescription is a formula named "supplementary spleen and stomach, yin-fire draining and yang elevating decoction". At his return visit after taking medicine for 1 week, he said had no more fever but headache frequently occurred after overwork and loose stool if nervous. The illness improved prominently after another one week. Subsequently, the therapeutic effect was maintained by agents which supplementing qi and enriching yin. Yuan-Qi-Yin-Fire hypothesis oriented from Li Dons-Yuan's Spleen-Stomach Theory served as an important guide for above clinical diagnosis, prescription, and treatment, and gained satisfactory effect.