The Spinal Endocannabinoid System Can Both Relieve and Worsen Nerve Pain, Depending on Conditions

This review reveals that the spinal endocannabinoid system's role in pain is context-dependent. While numerous studies show antinociceptive and neuroprotective effects, emerging evidence indicates that under specific pathological conditions, endocannabinoid system activation in the spinal cord can facilitate rather than inhibit pain transmission. The balance depends on cellular, molecular, and pathophysiological factors.

Narrative review integrating evidence on the spinal endocannabinoid system's bidirectional effects in neuropathic pain, examining cellular, molecular, and pathophysiological mechanisms.

Neuropathic pain is largely treatment-resistant, affecting millions. Understanding when the endocannabinoid system helps vs hurts pain could explain why some patients with nerve pain report cannabis helps while others find it ineffective or worsening.

The dual nature of spinal endocannabinoid signaling means that blanket cannabinoid therapy for nerve pain may not work for everyone. Understanding the conditions that flip the switch from pain relief to pain facilitation is crucial for developing targeted treatments.

Narrative review synthesizing primarily preclinical evidence. The conditions determining pro- vs anti-nociceptive effects are not yet fully characterized. Clinical translation of spinal cord-specific findings is challenging.