CU Boulder study: Narcotic painkillers cause chronic pain

Results of a three-month study released Monday by the university show opioids, such as morphine, cause an increase in chronic pain in lab rats, something that could have  implications for people, too.

Image by Shutterstock. Image of hands of a woman holding a pack of medicament sourced from Shutterstock. Available at: https://www.shutterstock.com/es/image-photo/hands-woman-holding-pack-medicament-255027928