One of the most challenging aspects of treating chronic pain is the fact that there’s no objective way to measure it – no number or test like blood pressure or cholesterol. But soon we might have something more specific than the scale of happy face to sad face. Dr. Sanjay Gupta talks with Dr. Prasad Shirvalkar, a physician and researcher who’s implanting electrodes in patients’ brains to better understand how pain is processed—and how we might one day stop it at the source. 

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