Yan Hu Suo is also known as Corydalis Rhizome. The acrid, bitter and warm herb has been used TCM as analgesic, sedative, anti- ulcer, anti-spasm agent and to treat chest and abdomen pain, irregular and/or painful menses, herniaetc, etc., as it moves Blood and Qi, calms pain, etc. by enhancing the functions of spleen, lung …