Transcutaneous electrical nerve stimulation (TENS) is actually a surface-used unit that provides lower voltage electrical current in the skin to produce analgesia. Corydalis could be the genus of the perennial flowering plant inside the poppy family with above 400 species. The tubers of corydalis (corydalis yanhusuo yan hu suo; https://monobookmarks.com/story20729000/the-greatest-guide-to-conoldine-alternative-natural-pain-relief