Scientists discover brain circuit driving chronic pain—could transform treatment

Scientists have uncovered a new neural circuit in the brain that controls chronic pain. This discovery reveals a key difference between how the body processes long-term and short-term pain. The findings could lead to more effective treatments for millions suffering from persistent discomfort. The newly identified circuit runs from the spinal cord to the thalamus, then through the cortex and brainstem before looping back. Unlike acute pain pathways, this network activates only during chronic pain states. Researchers found that chemically silencing its neurons in animal models reduced chronic pain behaviours without affecting normal pain responses.

In healthy mice, activating the circuit triggered lasting pain hypersensitivity, confirming its role in chronic pain. This suggests the network operates independently of the pathways responsible for acute pain. The team noted that around 60 million Americans experience chronic pain, often marked by heightened sensitivity to stimuli.

The study highlights that chronic pain relies on a distinct neural framework. While no human trials have yet tested this theory, the findings open possibilities for targeted treatments. Such interventions could ease chronic pain while preserving the body's ability to detect acute pain signals. This research offers a clearer picture of how chronic pain develops and persists. By isolating the responsible neural circuit, scientists may now explore therapies that disrupt chronic pain without impairing essential pain perception. The work also sheds light on how the nervous system encodes long-term bodily states.