TENS (Transcutaneous Electrical Nerve Stimulation) units have been a staple of drug-free physical relief for decades. Physical therapists use them. Chiropractors recommend them. Millions of people own them. And yet the conversation about TENS unit alternatives is accelerating, because the practical limitations of TENS units are real, and newer technologies are solving those problems in ways that TENS units fundamentally can't. If you've used a TENS unit and found it effective but impractical, or if you're evaluating drug-free relief options for the first time, this guide breaks down exactly how TENS units work, what they can't do, and how Signal Relief's patented patches offer a more effective and practical alternative. How TENS Units Work A TENS unit delivers low-voltage electrical pulses through adhesive electrode pads placed on the skin. These pulses interact with nerve signals traveling to the brain through two mechanisms: Gate Control Theory. Electrical stimulation activates large sensory nerve fibers that