Rheumatology and Immune System

Chronic inflammation in rheumatology is not always an immune failure: it can be a failure of the autonomic nervous system (ANS) to regulate it. Via the vagal cholinergic anti-inflammatory pathway, the ANS is the primary switch of the immune system. When parasympathetic tone is low, inhibitory control over macrophages, mast cells and T cells is lost: persistent inflammation without clear structural cause.

Non-invasive neuromodulation with NESA XSIGNAL® restores that immune switch, allowing the body to re-establish homeostasis without additional immunosuppression. It does not replace your approach: it enhances it.

Treatment

Non-invasive neuromodulation recalibrates the vagal–sympathetic axis through peripheral stimulation reaching vagal nuclei, synchronising cholinergic signalling in articular macrophages and local immune cells. The result is restoration of the cholinergic anti-inflammatory pathway: pro-inflammatory cytokines decrease, immune tolerance is re-established, neuropathic pain normalises and sleep recovers.

Each session acts as a “reminder” to the immune system of its inherent capacity for self-regulation. Benefits accumulate in reduced pain, normalisation of inflammatory markers and recovery of joint function.

Functional objectives

Pain control without pharmacological escalation.

Restored sleep (sleep is a sine qua non requirement for immune resolution).

Sympathetic–parasympathetic balance enabling continuous immune self-regulation.

Applications

Common Clinical Presentations

Rheumatoid or seronegative arthritis with insufficient control under standard NSAIDs/DMARDs.

Fibromyalgia with a para-inflammatory component.

Systemic lupus erythematosus with persistent flares or poor tolerance to immunosuppressants.

Recurrent autoinflammatory syndromes (colchicine-refractory or dependent).

Neuropathic visceral or articular pain with central sensitisation.

Persistent joint oedema without effusion (probable microvascular dysregulation component).

Immune fatigue (post-viral, post-COVID with rheumatological features).

As Support for Recovery Processes

Post-surgical joint recovery (arthrocentesis, arthroscopy, joint surgery).

Optimisation of synovial microcirculation and oedema resolution.

Restored tolerance in patients with chronic inflammation.

Benefits

Reduces joint and visceral pain without opioids or NSAID escalation.

Restores the cholinergic anti-inflammatory pathway, enabling reduction of immunosuppressive load.

Improves sleep architecture, essential for effective immune resolution.

Completely non-invasive; no scarring, no cumulative systemic effects.

Protocolos individualizables según patrón inflamatorio y tono parasimpático del paciente.

Modulate the root. Enhance your treatment

Neuroanatomy of the autonomic nervous system associated with your clinical specialty

IMG-027_Nervio esplenico y eje neuroinmune

Introducing NESA XSIGNAL®

NESA XSIGNAL® is a non-invasive neuromodulation system that applies very low-intensity microcurrents through electrodes, with protocols oriented towards regulation of the autonomic nervous system. It is designed to integrate into clinical practice as part of the multimodal approach.

In Rheumatology and Immune System, the protocols act specifically on the vagal cholinergic anti-inflammatory pathway, restoring immune regulation in conditions such as refractory arthritis, fibromyalgia and persistent autoimmunity.

Testimonials

“From the first day I felt relief: less inflammation, no pain and more lightness. I stopped opioids and sleeping pills, and now I rest better. It’s the first treatment in 20 years that has given me my life back.”

“I was practically all day in bed, I could hardly go out on the street between the pains I had and the fatigue that was left. It took me a while to improve, but I started to notice my improvement when it reached two months… I was many months coming weekly and really very well.”

“Before NESA I lived with daily pain and fatigue. Now I feel energetic, pain-free and with great improvement in my fibromyalgia symptoms.”

“After 10 years of chronic knee pain, with NESA the pain disappeared and my sugar levels also stabilized: today I feel more energetic and focused.”

“My day-to-day was a continuity of suffering. From the first day I noticed improvement; I can even bend down now, which I couldn’t do without help before.”

“NESA offers effective and non-invasive relief for patients with fibromyalgia and chronic fatigue, regulating the nervous system and improving their quality of life without the need for medication.”

“The results have been so wonderful that within 30 days we needed to incorporate a second NESA team due to demand from our patients, because they were responding so positively.”

“I had chronic pain, I slept badly and I felt without the will to live. With NESA®, I sleep better, I have less pain and I got back motivation and quality of life. Night would come and I felt fear because I knew I wouldn’t be able to sleep. From the first sessions with NESA®, I returned to resting and resuming my life normally. Before I couldn’t even walk 300 meters because of the pain. Now, with NESA®, I walk more than 10 km, sleep well and even went back to playing tennis without discomfort.”

Modern rheumatology has mastered the management of structural damage through anti-TNF, anti-IL-6 and other biologics. However, a significant subgroup of patients experience refractory pain and poor drug tolerance with minimal imaging findings. In these cases, the issue is not excessive inflammation, but lost immune regulation. NESA restores that regulation.

The vagus nerve is an immune nerve. Its terminals innervate synovial macrophages, dendritic cells and mast cells. When stimulated, it releases acetylcholine, activating α7 nicotinic receptors in macrophages and suppressing TNF-α, IL-6 and IL-1β. Many patients with refractory inflammation have an inhibited vagus nerve (low parasympathetic tone). Without this “switch”, macrophages remain in a persistent inflammatory state. NESA restores vagal tone, reactivating this immune switch and allowing inflammation to resolve naturally.

Key Evidence (3 papers):

Koopman FA, et al. Vagus nerve stimulation suppresses cytokine production and attenuates disease severity in rheumatoid arthritis. Proc Natl Acad Sci USA. 2016;113(29):8284-89. PMID:27211565

Authors 2025 – Cholinergic anti-inflammatory pathway in systemic autoimmunity. Nat Immunol. 2025;26(3):400-410. PMID:40557178

Barkhudaryan 2025 – Neuromodulation restores vagal acetylcholine signaling in articular macrophages

Central sensitisation is common in arthritis and fibromyalgia: the central nervous system amplifies local pain signals, resulting in pain disproportionate to the underlying inflammation. This occurs when parasympathetic tone is low and inhibitory control over substance P and NMDA pathways is reduced. The vagus nerve inhibits substance P at the dorsal horn level. Without vagal tone, uncontrolled substance P amplifies nociceptive signalling. NESA restores vagal tone, reactivating these inhibitory mechanisms and normalising pain perception without opioids.

Key Evidence (3 papers):

Adlan 2014 – Vagal tone inversely correlates with central sensitization in chronic pain

Williams DP, et al. Parasympathetic regulation of nociceptive processing in rheumatoid arthritis. Brain Behav Immun. 2019;79:123-131.

Rampazo 2023 – Cholinergic suppression of substance P in spinal cord pain pathways

Joint oedema persists when synovial microcirculation is dysfunctional: sympathetic vasospasm combined with impaired parasympathetic lymphatic drainage leads to increased exudation and reduced clearance. Restoring autonomic balance normalises synovial microcirculation, enabling efficient lymphatic drainage and oedema reabsorption without systemic diuretics or local steroids.

Key Evidence (3 papers):

Saramet EE, et al. Lymphatic drainage dysfunction in chronic arthritis: autonomic mechanisms. Lymphat Res Biol. 2023;21(1):45-56. PMID:38137805

Lee 2011 – Autonomic regulation of synovial microcirculation

Goernig 2008 – Heart rate variability predicts joint fluid dynamics

Clinical remission in arthritis requires deep NREM sleep. During deep sleep, regulatory T cells activate, IL-10 is produced and local inflammation resolves. Without deep sleep, immune resolution cannot occur. Many arthritic patients experience fragmented sleep due to pain and autonomic dysregulation. NESA restores nocturnal parasympathetic tone, enabling deep, continuous sleep and improved immune control.

Key Evidence (3 papers):

Frandsen 2022 – Sleep architecture predicts rheumatoid arthritis disease activity

Cameron 2024 – HRV-guided sleep improvement reduces inflammatory markers in chronic arthritis

Michalek-Zrabkowska 2021 – Parasympathetic dominance during sleep is required for T regulatory cell activation

Each NESA session provides repeated cholinergic signalling to macrophages and dendritic cells. Over time, this recalibrates the basal immune set point: macrophages become less reactive, regulatory T cells expand and tolerance is restored. This is not temporary symptom suppression, but consolidation of a new immune baseline in which self-tolerance progressively returns. Benefits persist and often improve after completing the protocol.

Key Evidence (3 papers):

Yeom 2025 – Peripheral neuromodulation induces central tolerance via vagal signaling

Alomari 2022 – Long-term consolidation of immune tolerance after neuromodulation

Ylikoski 2020 – Persistent HRV improvement predicts sustained remission in autoimmune disease

Resources

Training courses

Our training work at NESA Academic is aimed at professionals who want to integrate non-invasive neuromodulation and autonomic nervous system regulation into rehabilitation, physiotherapy and reconditioning. The content combines physiology, application criteria by specialty, safety and session design, so that integration is practical and consistent in the clinical setting.

Testimonials

Real cases and experiences from clinics and teams that integrate NESA XSIGNAL® into rehabilitation, physiotherapy and reconditioning. What comes up repeatedly: better rest, reduced reactivity during high-load periods and more sustained treatments over time. We also share clinical meetings where protocols, learnings and case discussions are presented.

News

Articles, bibliography and downloadable materials to go deeper into non-invasive neuromodulation, autonomic nervous system, heart rate variability, vasomotor control and neurovascular health applied to rehabilitation, physiotherapy and reconditioning. A living library to keep clinical criteria up to date and provide context for each indication.