Transcutaneous electrical nerve stimulation (TENS) is often a surface-applied unit that provides low voltage electrical current throughout the skin to provide analgesia. Corydalis is the genus of a perennial flowering plant in the poppy family with about four hundred species. The tubers of corydalis (corydalis yanhusuo yan hu suo; https://how-to-use-conolidine26157.targetblogs.com/38214400/conoldine-alternative-natural-pain-relief-an-overview