Objective: To observe the clinical effects of Warming Channel and Expelling Cold Umbilical Stick in treating primary dysmenorrhea of cold-damp stagnation type. Methods: 116 patients with primary dysmenorrhea of cold-damp stagnation type were randomized into a treatment group( 60 patients) and a control group( 56 patients). The control group was treated by conventional treatment,and the treatment group was treated by Warming Channel and Expelling Cold Umbilical Stick,in additional to conventional treatment. ...