TENS is a handheld device that sends electrical impulses through small electrodes by adhesive pads attached to your skin. The pads are usually placed right on the part of your body that hurts. When the device is turned on, the electrical impulses flow into the skin and have the potential of decreasing different types of pain.
https://blogs.webmd.com/pain-management/20210916/can-electricity-relieve-your-pain
