Research and Development of WPAPS Based on the Modern Technology of Traditional Chinese Medicine

The goal of this double-blind randomized controlled trial is to determine the efficacy of Warm Palace Analgesic Point Sticker in relieving dysmenorrhea compared to placebo sticker. The main questions it aims to answer are: * Can this Warm Palace Analgesic Point Sticker relieve dysmenorrhea? * It is more effective to certain type of TCM syndrome differentiation? Qi stagnation and blood stasis syndrome or cold dampness syndrome? Participants will : * receive test sticker or control sticker five days before every menstruation, once a day, five hours each time, for five consecutive days * take pictures of tongue * fill in some questionnaires after treatment