Scientists discover why we know when to stop scratching an itch

Medical Xpress

February 21, 2026

When you scratch an itch, something tells your brain when to stop. That moment of relief, when scratching feels "enough," is not accidental. Scientists have now identified a key molecular and neural mechanism behind this built-in braking system, shedding new light on how the body regulates itch and why this control fails in chronic conditions.