Objectives: To review evidence that the immune system plays a role in controlling the spread of cancer and findings that perioperative pain relief improves immune status and health outcomes.
Data sources: Research studies and review articles pertaining to immunity, immune function, stress, and immune-suppressive nature of pain.
Conclusions: Pain not only results in suffering but is a pathogen itself, capable of facilitating the progression of metastatic disease. Adequate pain relief decreases these risks.
Implications for nursing practice: Adequate pain relief is not only a primary concern in caring for individuals in pain but may be a matter of physiologic necessity as further studies reveal the immune-suppressive nature of pain.