“Complementary and alternative medicine (CAM) therapies may be used as a non-pharmacological approach to chronic pain management.

Inhaled cannabis, graded motor imagery, and Compound Kushen injection (a form of Chinese medicine) were found the most efficient and tolerable for chronic pain relief.”

https://www.ncbi.nlm.nih.gov/pubmed/30107944

https://www.sciencedirect.com/science/article/pii/S027858461830602X?via%3Dihub