Electrostimulators for pain relief are devices that use weak electrical impulses to alleviate both acute and chronic pain. They most commonly operate on the principle of the TENS method, which stands for Transcutaneous Electrical Nerve Stimulation. Through electrodes affixed to the skin in the painful area, they send out impulses that prevent pain signals from traveling to the brain. At the same time, they can promote the production of endorphins, natural pain-relieving substances that the body produces itself. This is a non-invasive and drug-free method used, for example, for back pain, joint pain, or after injuries.