itch

We know that yawning is "catching," but can you catch an itch? The answer is yes. We don’t mean a disease, like measles or chicken pox, that MAKES you itch–we’re talking about how just SEEING someone else scratch makes us want to do it too. And here’s something that will surprise you: Dental cavities are catching too!
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Most of the time, it doesn’t seem to help – Why does scratching help when we itch? It’s one of those things that most of us never think about?but scientists do?especially if they’re trying to find a cure for excessive itching. For many types of itches, it is not clear that the sensation serves any clear purpose

Scratching an itch helps relieve it by blocking the nerve cells that transmit the itch to the brain. BBC News quotes itch expert Gil Yosipovitch as saying, “Although there is a long way to go, methods that can induce a pleasurable scratch sensation without damaging the skin, via mechanical stimuli or drugs that can inhibit these neurons, could be developed to treat chronic itch.”
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