Abstract
Traumatic brain injury (TBI) is a major global health problem and a leading cause of long-term neurological disability. TBI produces a spectrum of persistent symptoms, including cognitive impairment, mood and behavioral disturbances, sleep disruption, fatigue, and autonomic dysregulation. Chronic pain is among the most debilitating sequelae, affecting physical, emotional, and social functioning. The etiology of post-TBI pain is multifactorial, arising from initial structural and biochemical injury to the nervous system, maladaptive neuroplastic changes, neuroinflammation, and psychological comorbidities that amplify pain perception and chronicity. This review explores the complex pathophysiology of post-TBI pain and outlines a multidisciplinary framework for management. Pain syndromes are classified according to the International Association for the Study of Pain's mechanistic framework as nociceptive pain (resulting from tissue injury and inflammation), neuropathic pain (due to lesion or disease of the somatosensory nervous system), and nociplastic pain (arising from altered nociceptive processing without clear evidence of tissue or nerve damage). Many patients exhibit mixed pain phenotypes driven by neuroinflammation and central sensitization. Pharmacologic approaches, including anti-inflammatory agents, anticonvulsants, and antidepressants, require cautious titration due to TBI-related comorbidities. Equally essential are non-pharmacologic strategies such as physical and occupational therapy, cognitive behavioral therapy, and neuromodulation techniques, which target both biomechanical and psychosocial contributors. Emerging innovations, machine learning for prognostication, blood biomarkers for structural injury, and neuro-reparative agents, represent the next frontier in personalized management. Effective care for post-TBI pain requires an integrated strategy that combines mechanistic classification, multidisciplinary treatments, and advancing diagnostic technologies.