Scratching makes us itch more because it tricks our brain. When we scratch, tiny nerves in the skin send messages to the brain, telling it that something is irritating our skin. The brain thinks the problem is getting worse and sends even more signals back down, so we feel like we need to scratch even harder! It's kind of like when you get a paper cut and keep poking at it with your finger.
Examples
- Scratching a mosquito bite makes it feel like it's getting worse, even though you're trying to make it better.
- You scratch your elbow because it itches, but then it feels like you need to scratch it more.
- Your friend scratches their arm and suddenly looks like they’re in pain, not relief.
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See also
- Why Do Humans Get 'Brain Freeze'?
- What Causes the ‘Phantom Vibration’ Feeling?
- What is prosopagnosia?
- What is electrophysiology?
- What is Basal ganglia?