Let's say you sprain your ankle and the doctor puts you on the good old RICE regimen: rest, ice, compress, elevate. He also suggests taking pain medicine as needed. 

Have you ever thought, how does the pain medicine know it's my ankle that hurts? 

If you have, you're not alone. If you haven't, you're welcome for that thought. Grace and Evie discuss how both pain and pain medicine are transmitted and interpreted by the brain. 

Photo by Diana Polekhina on Unsplash