糖尿病是碳水化合物代謝異常的疾病，除了造成血糖過高外，病久還會產生許多糖尿病併發症，涉及血管和神經病變。糖尿病除了採用西醫治療外，中醫治療也已有長遠的歷史。糖尿病的中醫病機是「陰虛為本，燥熱為標」，治療多採滋陰潤燥。本文使用中藥治療1個有5年糖尿病史的個案。在沒有使用西藥治療的情況下，利用補腎陽佐以滋陰潤燥的方法，經過九個月的中藥治療，讓患者的HbA1C由10.9%降至9.1%。

Diabetes mellitus is a diseases of abnormal carbohydrate metabolism. It causes hyperglycemia and many diabetic complications associated with vascular and neural diseases. Other than modern western medical treatment, traditional chinese medicine have been used to treat DM for a long time. The pathological mechanism of DM in traditional chinese medicine is「yin deficiency in root, and dryness heat in symptoms」, while 「nourishing yin and moistening dryness」 therapy is usually used. In this article, we present a case who has been diagnosed as type 2 DM for 5 years. We use supplementing kidney-yan therapy accompanied with nourishing yin and moistening dryness therapy to treat this patient without modern western medical treatment at the same time. After 9 months of treatment course, the HbA1C value of this patient lowers from 10.9 % to 9.1 %.