Transcutaneous Electrical Nerve Stimulation, or TENS, is a therapy that uses low-voltage electrical currents to relieve pain. It involves placing adhesive electrodes on the skin, which deliver electrical impulses to the underlying nerves. This stimulation can help block pain signals from reaching the brain and may also promote the release of endorphins, the body's natural painkillers. TENS is commonly used for various conditions, including chronic pain, arthritis, and muscle injuries. It is a non-invasive treatment option that can be used at home or in clinical settings. While generally considered safe, users should consult a healthcare professional before starting TENS therapy.