The Connections Between Pain and Itch: Shared Neuroimmune Mechanisms and Therapeutic Implications
Pain and itch are distinct somatosensory modalities with essential protective functions, yet they exhibit substantial neurobiological and clinical overlap. Although traditionally considered separate sensory systems, accumulating evidence indicates that nociception and pruritus are mediated and modulated by interacting neuronal populations, shared signaling pathways, and common inflammatory mechanisms. This review aims to synthesize current understanding of the convergent peripheral and central processes underlying pain and itch and to highlight their implications for diagnosis and treatment. RECENT FINDINGS: Recent advances have identified overlapping molecular and cellular substrates involved in pain and itch processing, including transient receptor potential (TRP) channels, G-protein–coupled receptors (GPCRs), and neuroimmune signaling mediated by cytokines, mast cells, and glial activation. At the spinal level, inhibitory gating mechanisms that suppress itch in response to noxious stimuli have been elucidated, as well as maladaptive plasticity contributing to central sensitization in chronic pain and chronic pruritus states. Clinically, these shared mechanisms manifest across diverse conditions, including neuropathic disorders, dermatologic diseases, and systemic illnesses, complicating phenotypic differentiation between pain-dominant and itch-dominant presentations. Therapeutic strategies increasingly target overlapping pathways, encompassing gabapentinoids, opioid-modulating agents, biologic therapies, and emerging gene-silencing approaches. Pain and itch represent interconnected sensory experiences supported by shared neurobiological substrates rather than fully independent systems. Integrating mechanistic insights with clinical phenotyping provides a unified framework for understanding these modalities and highlights opportunities for mechanism-based, cross-modal therapeutic strategies. Such an approach may improve diagnostic accuracy and optimize treatment outcomes for complex sensory disorders characterized by overlapping pain and itch phenotypes.
Dorsal Root Ganglion Stimulation for the Treatment of Burning Feet Syndrome Related to Erythromelalgia
Erythromelalgia (EM) is marked by recurring redness, intense burning sensations, and elevated limb warmth. The symptoms can severely impact the quality of life of those affected, resulting in considerable disability and suicidal tendencies. Treatment efficacy varies among individuals. A personalized approach incorporating genetic testing, multidisciplinary care, including interventional pain procedures, and long-term monitoring, is essential to optimize patient outcomes.
Peripheral Nerve Stimulation for the Management of Chronic Pain Syndrome: A Case Study of Complex Regional Pain Syndrome Posttrauma and After Surgery in the Leg
Our case study highlights the efficacy of PNS in the management of chronic pain syndromes, specifically CRPS, following major trauma and surgical intervention. Our case report involves a patient experiencing debilitating postoperative pain who underwent PNS treatment targeting the right infrapatellar branch of the saphenous nerve and posterior tibial nerve. Remarkably, the patient demonstrated a significant improvement in subjective pain levels with a reduction of approximately 75%, as well as enhanced functional capacity, compared to before the intervention.
Consensus Guidelines for the Use of Peripheral Nerve Stimulation in the Treatment of Chronic Pain and Neurological Diseases: A Neuron Project from the American Society of Pain and Neuroscience
Peripheral nerve stimulation (PNS) has evolved substantially over recent decades in terms of hardware and evidence supporting efficacy. Treatment targets continue to expand and address both pain and functional applications. The American Society of Pain and Neuroscience (ASPN) seeks to substantially update and expand upon a review of the evidence supporting PNS as well as provide guidelines for clinical practice. A diverse multidisciplinary panel of experts was selected to provide opinions and guidance based on evidence-graded assessment and clinical knowledge. This document aims to serve as a resource for clinicians and payors in the interest of expanding awareness of the breadth of research in the field of PNS and expanding access to therapy.
A Real-World Evaluation of Adjunctive Peripheral Nerve Stimulation for Superior Cluneal Neuropathy After Spinal Cord Stimulation
Even with successful spinal cord stimulation (SCS) therapy, pain of peripheral nerve origin can occur. Such areas of focal pain may be suitable for peripheral nerve stimulation (PNS). We report on the early clinical and technical aspects of a retrospective case series of PNS used for superior cluneal neuropathy as an adjunct to SCS.
General Innovations in Pain Management
Chronic pain management is constantly evolving, and our literature review aims to describe the general innovations happening within the field. The need for advancements in chronic pain is a necessity, as debilitating back pain and other forms of chronic pain are significant issues in the United States. Traditionally, medications have been the initial treatment options in cases of chronic pain; however, the advancement in pharmacogenetics has led to an increased ability to create more personalized medication plans. Additionally, neuromodulation in spinal cord stimulation, transcranial magnetic stimulation, transcranial direct-current stimulation, and dorsal root ganglion stimulation continue to see increased usage in mainstream chronic pain management. These techniques have continued to prove successful in many chronic pain management cases. They are allowing practicing physicians more confidence in the variety of treatment options. Lastly, great strides have also been made in stem cell and regenerative therapies, such as platelet-rich plasma injections, and artificial intelligence, further advancing the various treatment options and overall efficiency of pain management. This review aims to critically analyze and review the most up-to-date literature within each section mentioned and comprehensively discuss the future of innovation in chronic pain management.
Posterior Allograft Sacroiliac Joint Fusion with Pre-Operative Mapping
Low back pain is a highly prevalent and disabling condition. Sacroiliac joint dysfunction is prevalent in up to 62 % of some populations and is a common origin of low back pain. The posterior approach for minimally invasive sacroiliac joint fusion with an allograft is still relatively novel, with limited studies examining its safety and efficacy.
An Evidence-Based Consensus for the Use of Neurostimulation for the Treatment of Non-Surgical Low Back Pain: The NEURON Group
The use of electrical neuromodulation has often been limited to those with previous back surgery, peripheral neuropathy, and complex regional pain syndrome. Many patients with severe intractable low back pain were thought to be candidates for spinal cord stimulation (SCS), dorsal root ganglion stimulation, or peripheral nerve stimulation but did not meet the criteria. Recently, additional high-level data has supported the use of SCS in non-surgical low back pain (NSLBP), and United States Food and Drug Administration approval has been granted. The American Society of Pain and Neuroscience (ASPN) executive committee realized an unmet need to develop criteria for patient selection for this specific patient population. This is a NEURON project (neuroscience, education, utilization, risk mitigation, optimal outcomes, and neuromodulation), a living guideline for evolving therapies and indications, and is focused on the use of neuraxial stimulation for the treatment of refractory pain.
Successful Pain Management of Uncontrollable Left Wrist Pain With Peripheral Nerve Stimulation Following Failed Surgeries: A Case Report
This case study examines a 50-year-old patient with a history of CRPS type II of the left superficial radial nerve, who underwent 15 interventions, including 6 unsuccessful surgeries since 2021, and experienced extreme, uncontrolled pain after a work-related injury. After the permanent implantation of peripheral nerve stimulator (PNS) in November 2022, the patient enjoyed remarkable pain relief for the past one and a half years, with no signs of complications or necessity for further interventions. The PNS trial, permitted by work compensation rules, utilized a single incision technique, anchoring the leads to the brachioradialis fascia using a figure-of-eight 2.0 silk suture configuration.
Clinical Outcomes for Minimally Invasive Sacroiliac Joint Fusion with Allograft Using a Posterior Approach
Sacroiliac joint (SIJ) dysfunction can occur as a result of injury, degeneration, or inflammation. This dysfunction presents symptoms of pain at various locations, including the low back, hips, buttocks, and legs. The diagnosis of SIJ dysfunction is challenging and cannot be achieved solely with imaging studies such as X-rays, MRI, or CT. The current gold standard diagnostic modality is intra-articular SIJ blocks using two differing local anesthetics. Current treatments for SIJ dysfunction may be beneficial for short-term relief but lack long-term efficacy. The purpose of our study was to examine the outcomes of patients who underwent minimally invasive, posterior SIJ fusion using allograft at a single center.