Chronic pain is a major global health issue9 with immense social and economic impacts,4,8 yet has proven difficult to operationalize.25 Chronic pain is often defined by pain duration,1,13,23,25,26 where pain persisting 3-6 months or more since onset can yield prevalence estimates for chronic pain ranging from 19% to 43%, or up to 116 million Americans.10,12,15,19,26 While conceptually appealing, this hotly debated7 approach does not consider the multi-dimensional nature of chronic pain, namely the presence of activity limitations and participation restrictions,5,17,30-36 classifications recognized by the World Health Organization.
from The Journal of Pain https://ift.tt/2ngkHK6
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