How does the gate control theory explain pain?

The answer

The gate control theory of pain, proposed by Ronald Melzack and Patrick Wall in 1965, revolutionized pain science by explaining that pain signals can be modulated by a neural 'gate' in the spinal cord's dorsal horn. Large-diameter nerve fibers carrying touch and pressure signals can inhibit the transmission of pain signals carried by smaller-diameter C fibers and A-delta fibers, effectively closing the gate. This explains why rubbing an injury reduces pain and why transcutaneous electrical nerve stimulation (TENS) therapy works. The theory also incorporated the role of descending signals from the brain, explaining how attention, emotion, and expectations can amplify or suppress pain perception. This framework laid the groundwork for modern multimodal pain management approaches.