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Pain Management — Clear Glass

Pain Management

Pain is a multidimensional experience influenced by biological, psychological, and social factors. It can be classified as acute, chronic, nociceptive, neuropathic, or central. Chronic pain affects over 20% of adults worldwide, prompting research into non-opioid and complementary treatments.

Pain Pathway

  1. Transduction — Activation of nociceptors by noxious stimuli.
  2. Transmission — Signal relay via A-delta and C fibers to the spinal cord and brain.
  3. Perception — Conscious awareness in the cerebral cortex.
  4. Modulation — Alteration of the pain signal via descending pathways (serotonin, endorphins).

Neuropathic pain arises from damage to somatosensory pathways, while inflammatory and nociceptive pain involve prostaglandin and cytokine signaling.

Pain pathway diagram

Clinical Evidence & Trials

Chronic Pain

Meta-analysis (Whiting et al., 2015) shows moderate evidence for cannabinoids in chronic pain and spasticity.

Neuropathic Pain

CBD and THC show benefits in multiple sclerosis, HIV neuropathy, and chemotherapy-induced neuropathy.

Cancer & Palliative Care

RSO and full-spectrum cannabis extracts may improve quality of life and sleep in palliative settings.

Conventional Pharmacological Management

Non-Opioid Analgesics

  • NSAIDs (e.g., ibuprofen, naproxen) — COX inhibition; for inflammatory pain.
  • Acetaminophen — Centrally acting; limited anti-inflammatory properties.

Opioids

  • Examples: Morphine, oxycodone, fentanyl.
  • Mechanism: Bind mu, delta, and kappa receptors.
  • Risks: Tolerance, dependency, respiratory depression.

Adjuvant Agents

  • Antidepressants (e.g., amitriptyline) — Enhance descending inhibition.
  • Anticonvulsants (e.g., gabapentin, pregabalin) — Reduce neuronal excitability.

Herbal Medicines & Natural Compounds

Traditional Remedies

  • Turmeric (Curcumin) — Anti-inflammatory; inhibits NF-κB and COX-2.
  • Willow Bark — Salicin precursor to aspirin.
  • Capsaicin — TRPV1 receptor agonist used topically.

Medical Cannabis & Derivatives

CBD (Cannabidiol)

  • Non-psychoactive; modulates endocannabinoid system.
  • Inhibits FAAH, increases anandamide.
  • Reduces inflammation and modulates TRPV1.

THC & THCA

  • THC — Psychoactive; binds CB1 receptors.
  • THCA — Non-psychoactive; anti-inflammatory, neuroprotective.

CBCD (Cannabichromedial)

Under research; potential anti-inflammatory effects.

RSO (Rick Simpson Oil)

  • High-THC extract; anecdotal use for cancer pain.

Risks: Psychoactive effects, legal restrictions.

Advantages & Limitations

Advantages

  • Non-opioid alternative.
  • Lower risk of respiratory depression.
  • Anti-inflammatory and anxiolytic co-benefits.

Limitations

  • Psychoactivity (THC).
  • Legal/regulatory challenges.
  • Inconsistent formulations.
  • Limited large-scale RCTs.

Safety, Legal Status & Regulation

  • CBD — Legal in many countries if <0.3% THC.
  • THC/RSO — Controlled in many jurisdictions.

Common side effects: dizziness, dry mouth, mood changes.