Despite widespread use of the "smiley face" pain scale in clinics, some researchers say a more empirical approach would be better. A new electroencephalography-based test could offer a better way for patients to rate their pain and could also ease the over-prescription of opioids, a new study shows.

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Despite widespread use of the "smiley face" pain scale in clinics, some researchers say a more empirical approach would be better. A new electroencephalography-based test could offer a better way for patients to rate their pain and could also ease the over-prescription of opioids, a new study shows.