Scratching releases serotonin. Case closed. Problem solved. Now we can move to science that answers real questions. Like what came first...the chicken or the egg.
External Link : https://www.irishexaminer.com/breakingnews/lifestyle/features/appliance-of-science-why-does-it-feel-good-to-scratch-an-itch-911580.html
Appliance of science: Why does it feel good to scratch an itch?
Lots of things can cause us to itch but there is one unanimous response to the sensation — scratching. There is nothing quite so satisfying as scratching an itch, but what causes the itch in the first place, and why does scratching bring such relief?
Xavierswallows