Transcutaneous electrical nerve stimulation (TENS) is sometimes useful for relieving severe, persistent pain, such as back pain. In TENS, electrical impulses are relayed from an impulse generator to electrodes placed on the skin in the area of the pain. After about 30 minutes, pain may be significantly reduced. Relief may last for several hours. TENS can be used while pursuing normal activities.
From the 2010 revision of the Complete Home Medical Guide © Dorling Kindersley Limited.