Why Does Scratching Make Itching Worse?

It’s hard to resist the urge to scratch an itch, but doing so could help break that vicious cycle of itchiness. Hosted by: Stefan Chin Head to https://scishowfinds.com/ for hand selected artifacts of the universe! ---------- Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow ---------- Dooblydoo thanks go to the following Patreon supporters: Lazarus G, Sam Lutfi, D.A. Noe, سلطان الخليفي, Piya Shedden, KatieMarie Magnone, Scott Satovsky Jr, Charles Southerland, Patrick D. Ashmore, Tim Curwick, charles george, Kevin Bealer, Chris Peters ---------- Looking for SciShow elsewhere on the internet? Facebook: http://www.facebook.com/scishow Twitter: http://www.twitter.com/scishow Tumblr: http://scishow.tumblr.com Instagram: http://instagram.com/thescishow ---------- Sources: https://www.eurekalert.org/pub_releases/2014-10/wuso-wsm102814.php https://www.scientificamerican.com/article/why-does-scratching-an-itch-make-it-itchier/ https://www.cell.com/neuron/abstract/S0896-6273%2814%2900901-5 https://www.ncbi.nlm.nih.gov/books/NBK27940/ http://www.caltech.edu/news/microbes-help-produce-serotonin-gut-46495 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2991051/ https://www.nature.com/news/scientists-discover-molecular-trigger-for-itch-1.13061