I studied some important medical liter atures in order to examine the cause of Aphasia and found out some facts as follows : 1. Hwang Je Nae Kgong(黃帝內經) is more referred exogenous causes of disease of Aphasia than endogenous causes of disease. 2. Among many causes of Aphasia, exogenous causes of disease was cinsidered to be most common in Soh Shi Je Byong Won Hu chong Rhon(巢氏諸病源喉總論), which has had a wide influence down the ages. 3. Chon Keum Yo Bang(千金要方), Chi Tae Bhi Yo(外臺秘要), Tae Pyong Song Hye Bang(太平聖惠方), Song Je Chong Rok(聖濟總綠). Bu In Yang Bang(婦人良方) and so forth had been quoted from Hwang Je Nae Kyong and Soh Shi Je Byong Won Hu Chong Ron(巢氏諸病源喉總論). 4. In the ming dynasty had been quoted non-exo-endogenous causes of disease and the Kinds of Aphasia and prescription. 5. In the Choeun dynasty and the Ching dynasty, exogenous causes of disease was confined to the quotation of the books referred to above as well, but endogenous causes of disease was developed. 6. Today is refered kidney and Aphasia. The cause of Aphasia obtained was as follows. The exogenous cause of disease is wind, wind and cold, wind and heat. The endogenous cause of disease is pregnancy, heart block of postpartum, weakness of heart and kidney, impairment of seven modes of emotions, stagnation of phlegm and phlegm-fire, hemorrhage. The non exo-endogenous causes of disease is sing ballads and call out.