Objective : We Explored the meaning of the 厥逆 in Gangpyeong-Shanghanlun through two cases. Methods : We analyzed the original form of 厥逆 and the contexts in Shanghanlun. At the same time, we analyzed 2 clinical cases treated with 大靑龍湯 (Daecheongryong-tang) according to the newly deduced definition of 厥逆. Results : 厥逆 can be interpreted as 'Being indulged and indigestive'. We analyzed the cases and found that both cases were related to eating disorder even though their chief complaints were different. We also found that 大靑龍湯 was effective for both bulimia nervosa and anorexia nervosa. Conclusions : 厥逆 is symptoms of reflux in human body such as, gastroesophageal reflux disease, as a result of concentration or indulgence. We analyzed the two cases with DSM-5 and found that the two cases also can be diagnosed with eating disorder along with the provision (38條, 大靑龍湯). We found out the possibility of correlation between eating disorder and 38條, however, more advanced clinical studies are needed in the future.