What is neuropathy and how does it manifest?
Neuropathy is a general term for diseases affecting peripheral or central nerves, leading to a disruption of their functions. This condition can manifest with a wide spectrum of symptoms, including numbness, tingling, burning, weakness in the limbs, as well as chronic pain. Neuropathic pain, in particular, is one of the most difficult forms of pain to treat, arising from damage or dysfunction of the nervous system. Understanding the nature of neuropathy and its causes is the key to effectively managing this condition.
Main causes of neuropathy development
The causes of neuropathy are diverse and can affect both the central and peripheral nervous systems. One significant cause is neurotoxicity associated with anticancer therapy. Chemotherapeutic agents used to treat oncological diseases often cause neurological side effects. These complications can be dose-limiting, prevent the continuation of treatment, and significantly reduce patients' quality of life [6]. Symptoms can manifest acutely, immediately after treatment, or long after its completion. It is important to note that many chemotherapeutic agents can cause similar toxic effects, and some of them are capable of exacerbating symptoms [6].
Another important cause is damage to the central nervous system (CNS), which can lead to the development of central neuropathic pain. Such damage can be the result of various diseases or injuries, and their consequences represent a serious challenge for physicians [2].
Although not all possible causes are listed in the provided sources, it is important to understand that neuropathy can also be caused by factors such as:
- Diabetes mellitus (diabetic neuropathy)
- Infections (e.g., shingles, HIV)
- Autoimmune diseases
- Injuries and nerve compression
- Vitamin deficiencies (especially B vitamins)
- Exposure to toxins (other than chemotherapy)
- Hereditary factors
Understanding the specific cause of neuropathy is critically important for selecting the most effective treatment strategy.
Central neuropathic pain: mechanisms and challenges
Central neuropathic pain (CNP) occurs after damage to the central nervous system and is one of the most complex forms of chronic pain. Research shows that neuronal hyperexcitability in damaged areas of the CNS plays a key role in the development of CNP [2]. This condition is characterized by abnormal activity of nerve cells, which leads to constant pain sensations even in the absence of external stimuli.
The mechanisms underlying this hyperexcitability include changes in the functioning of various neurotransmitter systems and ion channels. In particular, it is believed that anticonvulsants used to treat CNP act by enhancing the inhibitory action of gamma-aminobutyric acid (GABA), reducing abnormal neuronal hyperexcitability through the modulation of sodium and calcium channels, and by inhibiting the action of excitatory amino acids [2]. As a result, the suppression of excessive neuronal activity lies at the heart of using anticonvulsants for both epilepsy and neuropathic pain [2].
Modern approaches to pharmacological treatment of neuropathy
Treatment for neuropathy is aimed at alleviating symptoms, eliminating the cause (if possible), and improving the patient's quality of life. Pharmacological therapy plays a central role, especially in the management of neuropathic pain.
Anticonvulsants
Anticonvulsants (anti-seizure medications) are the cornerstone in the treatment of central neuropathic pain. Both first-generation drugs, such as phenytoin, benzodiazepines, valproate, and carbamazepine, and second-generation drugs, including lamotrigine, gabapentin, and topiramate, are used [2]. These drugs help stabilize nerve activity and reduce pain. For example, topiramate, in addition to its use for neuropathic pain [2], is also frequently used for migraine prevention, where it can modulate oxidative stress and neurogenic inflammation, which contribute to central nervous system hypersensitivity [8].
Innovative methods in migraine treatment (as an example of neurogenic pain)
Although neuropathy covers a wide spectrum of conditions, some innovative approaches developed for migraine treatment can serve as an example of the development of therapy for neurogenic pain syndromes. Migraine, which is a chronic neurovascular disorder, is characterized by episodes closely linked to neurovascular hypersensitivity [8].
A significant breakthrough in the preventive treatment of migraine occurred with the advent of monoclonal antibodies targeting the calcitonin gene-related peptide (CGRP) or its receptor [1]. These drugs, administered subcutaneously or intravenously on a monthly or quarterly basis, have shown high efficacy and good tolerability in clinical trials [1]. Such drugs include eptinezumab, rimegepant, and atogepant, which have been approved by the European Medicines Agency [3]. In some cases, such as migraine associated with mitochondrial diseases, these antibodies (e.g., erenumab) have also shown efficacy and safety [5]. The French Headache Society even suggests considering them as first-line therapy for certain groups of patients with severe migraine [3].
Neuromodulation and other innovative methods
In addition to pharmacological treatment, neuromodulation methods are actively developing in neurology, allowing for the modulation of the nervous system to alleviate symptoms. Neuromodulation includes various approaches aimed at altering nerve activity [1].
One example of neuromodulation is transcutaneous vagus nerve stimulation (t-VNS). Although it is currently being actively researched and applied to improve cardiac function and alleviate clinical symptoms in patients with heart failure by modulating the autonomic nervous system balance [7], the principles of nerve stimulation can be adapted for other neurological conditions as well. This highlights the potential of non-invasive methods of influencing the nervous system for therapeutic purposes.
Overall, over the past 125 years, neurology has evolved from a purely observational discipline to a field with outstanding achievements in the treatment of certain diseases, such as multiple sclerosis or the surgical treatment of Parkinson's disease [4]. Although progress has not been constant in all areas, the drive for innovation continues to push forward the development of new methods for treating neuropathy and other neurological disorders.
Perspectives and the importance of timely treatment
Neuropathy, manifesting as numbness, pain, and other neurological symptoms, requires a comprehensive and individualized approach to treatment. Early diagnosis and timely intervention can significantly improve the prognosis and quality of life for patients. Given the variety of causes, from chemotherapy neurotoxicity [6] to CNS damage [2], it is crucial to accurately determine the etiology of the disease.
The continuous development of pharmaceutical agents, including anticonvulsants [2] and new classes of drugs such as monoclonal antibodies against CGRP [1, 3, 5], as well as the improvement of neuromodulation methods [1, 7], open new perspectives for more effective and targeted treatment. Collaboration between the patient and the physician, as well as an interdisciplinary approach, are key to the successful management of neuropathy.
Sources
- 1. Preventive treatment of migraine. (Continuum (Minneapolis, Minn.), 2021)
- 2. Anticonvulsants for central pain. (Expert opinion on pharmacotherapy, 2002)
- 3. Migraine treatment: position paper of the French Headache Society. (Revue neurologique, 2024)
- 4. Treatment in neurology: a winding path from 1897 to 2022. (European neurology, 2022)
- 5. Preventive treatment of migraine in mitochondrial diseases: a case report of erenumab efficacy and literature review. (Neurological sciences : official journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology, 2022)
- 6. Neurological complications of cancer chemotherapy. (Seminars in oncology, 2006)
- 7. Efficacy of transcutaneous vagus nerve stimulation in the treatment of heart failure – a systematic review and meta-analysis. (BMC cardiovascular disorders, 2025)
- 8. Modulation of oxidative stress and neurogenic inflammation: the role of topiramate in migraine treatment. (Frontiers in aging neuroscience, 2024)
Important note
The information presented in this article is for reference purposes only and is not intended for self-diagnosis or self-treatment. Always consult a qualified medical professional for a diagnosis and the selection of an optimal treatment plan.