Key facts
- Scratching bug bites makes them worse.
- Scratching provides temporary relief from itching.
- Scratching activates pain-sensing nerves.
- Activated pain-sensing nerves stimulate immune cells.
- Immune cells release inflammatory substances.
- This leads to increased inflammation.
- The process perpetuates an itch-scratch cycle.
- Research was conducted on mice.
New research has shed light on the biological mechanisms behind why scratching an itchy bug bite makes the sensation worse. Studies conducted on mice indicate that the act of scratching, beyond providing temporary relief, triggers a cascade of physiological responses that exacerbate the itch. Specifically, scratching activates pain-sensing nerves. These activated nerves then signal to immune cells, prompting them to release inflammatory substances. This inflammatory response leads to a more intense and prolonged itch, creating a vicious itch-scratch cycle. The findings explain the common experience of scratching a bite and finding it becomes even more irritating.