Why do we have pain in the absence of injury, or long after our tissue has healed? How can the same pain stimulus feel so different, depending on who you are, or even what day it is?  Neurosurgeon and CNN Chief Medical Correspondent Dr. Sanjay Gupta, author of It Doesn't Have to Hurt: Your Smart Guide to a Pain-Free Life, talks about some of the surprising developments in pain science, including non-opioid treatments you may not know about.

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