Wen Dan Tang is specially formulated for disharmony between gallbladder and stomach and the resulting phlegm heat. In traditional Chinese medicine (TCM), the harmony between the gallbladder and stomach ensures the Qi energy flows smoothly and their proper function. If disharmony between the gallbladder and stomach occurs, Qi is blocked in flow and may be transformed into "phlegm" (Please notice the concept of "phlegm" in TCM is not identical to but broader than phlegm used in our common term) and generates heat.