Cortisol, Serotonin, and Dopamine: The Neurochemistry of Touch
Part 5A · Section 5: Neurochemistry of Touch
Cortisol, Serotonin, and Dopamine: The Neurochemistry of Touch
Skilled manual therapy produces measurable neurochemical shifts — not subjective impressions, but quantifiable changes with direct implications for pain and mood.
A synthesis of massage therapy research has documented the following average changes following skilled manual treatment: cortisol ↓ 31%, serotonin ↑ 28%, dopamine ↑ 31%. These are not subtle effects — they represent meaningful shifts in the neurochemical systems that govern pain, mood, and motivation.
Cortisol: The Stress Hormone
Chronically elevated cortisol suppresses immune function, disrupts sleep, and impairs the descending pain inhibitory pathways. A 31% reduction represents meaningful downregulation of the HPA axis — clinically significant for patients whose stress and pain are mutually reinforcing. This is not a side benefit of treatment; it is a primary therapeutic mechanism.
Serotonin: Dual Role in Pain and Mood
Serotonin participates directly in the descending pain inhibitory system: serotonergic projections from the raphe nuclei suppress pain transmission in the dorsal horn. Low serotonin is consistently associated with fibromyalgia, depression, and chronic pain. A 28% increase shifts a neurotransmitter that directly participates in the pain suppression system — not just mood.
Dopamine: Motivation and Anticipation of Relief
Dopamine is involved in pain's motivational dimensions — including the anticipation that treatment will help. For patients who have become avoidant and pessimistic about recovery, raising dopamine may lower the threshold for re-engaging with therapeutic activity — including the exercise and movement that are essential for lasting recovery.
Substance P: Reducing the Pain Signal
Substance P is a neuropeptide involved in spinal pain transmission. Serotonin increase is associated with substance P reduction — suggesting the neurochemical shift from manual therapy may reduce pain transmission at the spinal level, addressing the central sensitization that underlies chronic pain.
Key Takeaways
- Massage therapy: cortisol ↓31%, serotonin ↑28%, dopamine ↑31% — quantifiable neurochemical shifts
- Serotonin participates in descending pain inhibition; its increase is associated with substance P reduction
- Dopamine increase may support re-engagement in patients who have become avoidant and pessimistic
- These changes have been documented across fibromyalgia, depression, rheumatoid arthritis, and occupational stress
Field T, et al. Cortisol decreases and serotonin and dopamine increase following massage therapy. Int J Neurosci. 2005;115(10):1397–1413.
Field T. Massage therapy research review. Complement Ther Clin Pract. 2014;20(4):224–229.
CALee Acupuncture — Hoon Lee, L.Ac., DAOM(c)
Buena Park, CA · Korean Therapeutic Bodywork · Acupuncture · Pain Management
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