The sensation of itchiness can be maddening. Learn what's going on in your nerves and brain when you itch -- and when you scratch that itch -- in this classic episode of BrainStuff.Learn more about advertising on the HowStuffWorks podcasts at www.howstuffworks.com/advertisers.htmAnd to learn about your ad choices when listening to podcasts, visit https://www.howstuffworks.com/privacy.htm#ad-choices
