Exercise

Ever Have Super Itchy Legs While Running? Blame Your Capillaries

Let's say you haven't gone for a run in a while (you're not alone), and decide to lace up and hit the pavement once again. You start your jog, but you only get about a block from your house when your legs start getting unbearably itchy. It's an all-over tingle that, fortunately, does not mean you're allergic to exercise. This extreme discomfort is basically your capillaries saying, "What are you making us do?!" Watch the video below to learn why this happens, as well as the painful way to cure the itch.

Why Do My Legs Itch When I Run?

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Why Do We Itch?

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Key Facts In This Video

  1. Itches, pain, and heat all follow the same neural pathways, but itches trigger special receptors called pruriceptors. 00:38

  2. Pruriceptors are attuned to touch as gentle as the pressure of a fly's legs. 01:12

  3. Itching activates more skin cells than the pruriceptors, which may be drowned out by these other signals or just turned off. 01:52

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Written By Curiosity Staff March 14, 2017