While it has been suggested there is a link between stress and delayed wound healing, less is known about the role of pain as a contributor to stress. This paper reviews the evidence for this from studies of acute, surgical and chronic wounds.
Solowiej, K., Mason, V. L., & Upton, D. (2009). Review of the Relationship Between Stress and Wound Healing: Part 1. Journal of Wound Care, 18(9), 357-366. https://doi.org/10.12968/jowc.2009.18.9.44302