Neuropathic pain — pain caused by damaged or dysfunctional nerves rather than ongoing tissue injury — is unpredictable by nature, and that unpredictability is one of its most disruptive features. Many patients with peripheral neuropathy describe their worst episodes not as a gradual worsening but as sudden, intense flares that arrive without obvious warning and can last hours or days. At Awakenings by Northwest Ohio Ketamine in Toledo, we work with patients whose nerve pain has not responded adequately to conventional treatment, and understanding what drives these flares is an important part of finding more effective management strategies.
How Neuropathic Pain Differs from Other Pain
To understand what causes neuropathic flares, it helps to understand what makes neuropathic pain distinct. Peripheral neuropathy occurs when nerves in the peripheral nervous system — the network of nerves outside the brain and spinal cord that transmits signals between the central nervous system and the rest of the body — become damaged or dysfunctional. When nerve fibers are injured, they do not simply stop working. Instead, they can become unstable, misfiring spontaneously or generating pain signals in response to stimuli that would not ordinarily trigger pain (National Institute of Neurological Disorders and Stroke).
The result is a pain experience that does not obey the ordinary rules of cause and effect. A person with healthy nerves who sits too long in one position may feel discomfort that resolves when they move. A person with peripheral neuropathy may experience that same position as acutely painful — or may experience burning pain, electric shocks, or intense tingling while sitting perfectly still. The nerve fibers are generating signals independently of any actual threat to the tissue they serve.
This instability is not fixed. It fluctuates in response to the nerve fibers’ physiological state, which is influenced by a range of internal and external variables. Those variables are what constitute neuropathy triggers.
Physiological Triggers: What the Body Is Doing
Among the most significant physiological contributors to neuropathic flares is blood glucose dysregulation. Diabetic peripheral neuropathy — caused by sustained high blood sugar damaging the small blood vessels that supply peripheral nerves — is the most common form of peripheral neuropathy in the United States. Even in patients with established neuropathy, acute spikes or drops in blood glucose can trigger intensification of symptoms, because the nerves are sensitive to changes in their metabolic environment. Patients who notice their neuropathy worsening after dietary changes, missed medications, or periods of unusual stress often find that blood glucose fluctuation is a significant contributor.
Temperature is another well-documented physiological trigger. Cold temperatures cause vasoconstriction — the narrowing of blood vessels — which reduces circulation to the extremities and can intensify neuropathic symptoms in areas already compromised by poor nerve blood supply. Many patients with peripheral neuropathy report that symptoms in the feet and hands worsen significantly in cold weather or after prolonged exposure to cold surfaces, while warmth sometimes provides temporary relief. The reverse pattern — heat intolerance — is also reported in some neuropathy presentations, reflecting the diversity of nerve fiber involvement across different patients.
Circulatory factors more broadly affect neuropathic flares. Extended periods of remaining in one position can compress blood vessels and nerves simultaneously, triggering temporary intensification of symptoms. This is part of why many neuropathy patients report worsening symptoms after prolonged sitting, particularly if their condition affects the lower extremities.
Lifestyle and Environmental Factors
Alcohol consumption is a direct neurotoxin that damages peripheral nerve fibers over time — alcoholic neuropathy is a recognized clinical entity — but even in patients whose neuropathy has a different primary cause, alcohol can temporarily worsen symptoms by affecting nerve excitability and reducing the quality of sleep. Sleep quality itself is a significant factor: sleep deprivation lowers pain thresholds across the nervous system and allows less opportunity for the overnight neuroregulatory processes that partly offset daytime pain amplification.
Physical overexertion — pushing beyond what the compromised nervous system and supporting musculature can comfortably sustain — frequently triggers flares in the hours or days following activity. This creates a difficult management problem for neuropathy patients: inactivity worsens circulation and contributes to deconditioning that increases pain sensitivity, while overactivity directly provokes flares. Finding the appropriate activity level is a meaningful clinical goal that varies considerably by individual. Our blog post on managing chronic nerve pain with 5 effective strategies explores practical approaches to this balance.
Stress activates the sympathetic nervous system — the body’s threat response system — which in turn affects nerve excitability, blood vessel tone, and inflammation. Patients who notice their neuropathic symptoms intensifying during periods of sustained emotional stress are likely experiencing a real physiological effect, not simply a psychological one. The connection between psychological stress and peripheral neuropathy symptom intensity reflects shared neurological pathways between the stress response and pain processing systems.
Central Sensitization: When the Nervous System Amplifies Everything
Beyond the peripheral triggers described above, many patients with long-standing neuropathy develop a secondary process that complicates flare management significantly. Central sensitization — a state in which the brain and spinal cord become persistently amplified in their response to pain signals — means that the threshold for triggering a flare progressively lowers over time. Stimuli that the nervous system once processed without pain eventually begin to produce pain. The volume on the nervous system’s pain-processing activity is turned up, and it stays up.
Central sensitization explains why neuropathy patients often describe symptoms spreading beyond the original affected area, why stimuli like light touch or mild temperature changes become painful, and why the triggers that cause flares seem to multiply over time. It also explains why treatments aimed solely at the peripheral nerves often provide incomplete or diminishing relief in patients who have had neuropathy for years: the central component of the pain has become partially self-sustaining, independent of what is happening in the peripheral nerves (National Institute of Neurological Disorders and Stroke).
Addressing central sensitization requires treatments that work at the level of the central nervous system — and this is where IV ketamine infusion therapy becomes directly relevant.
How IV Ketamine Addresses Neuropathic Flares at Their Source
IV ketamine works by blocking NMDA receptors (N-methyl-D-aspartate receptors), which are a critical component of the glutamate system — the brain’s primary excitatory neurotransmitter network. NMDA receptor overactivation is a central mechanism in the development and maintenance of central sensitization. By interrupting this receptor activity, IV ketamine may reduce the amplified, self-sustaining pain processing that underlies the most treatment-resistant neuropathic pain presentations (research on ketamine for chronic pain via NMDA receptor action).
This is a mechanistically different approach than the medications most neuropathy patients have already tried. Anticonvulsants like gabapentin and pregabalin reduce overall nerve excitability but do not directly target the NMDA receptor-mediated central sensitization. Tricyclic antidepressants affect pain modulation through monoamine pathways, again without directly addressing the glutamate system. For patients who have not achieved adequate relief through these standard approaches, IV ketamine’s distinct mechanism of action means that prior treatment failure does not predict ketamine failure — the two approaches are working on different aspects of the pain system. You can also learn more about ketamine for chronic pain management and how this approach extends to other pain conditions we treat.
At Awakenings, we administer ketamine exclusively by the intravenous route, which provides minute-to-minute dose control and allows our providers to optimize and adjust the infusion in real time. Each session takes place in a private room at our clinic in Toledo, with continuous monitoring of pulse, oxygen levels, and blood pressure throughout. Dr. William James, our founder and director, brings deep expertise in anesthesiology and pain management. Dr. Nadeem Moghal completed a fellowship at the Cleveland Clinic Foundation Pain Management Center. Ben Wagner, PMHNP-BC, our board-certified Psychiatric Mental Health Nurse Practitioner, ensures that the psychological dimensions of chronic neuropathic pain — which are substantial — receive appropriate clinical attention.
Results vary by individual. IV ketamine is not appropriate for every patient with neuropathy, and candidacy is determined through a thorough evaluation of your medical history, current medications, and prior treatments. We encourage you to discuss all treatment options with our providers and with any clinicians currently involved in your care. We offer a free initial consultation to begin that process.
What Keeps People from Getting Help — and What We Can Tell You
Scheduling is a practical barrier that comes up regularly. Patients with severe neuropathy often manage transportation challenges, unpredictable flares that make planning difficult, and significant fatigue that makes any additional appointment feel like a burden. We serve patients across the Ohio and Michigan area from our clinic at 7053 Central Ave in Toledo, and we structure our consultation process to be as straightforward as possible. A free initial phone consultation can establish whether an in-person evaluation makes sense before you commit to the trip.
Cost is the other consistent concern. We do not accept insurance as a primary payer for IV ketamine infusions. However, some insurance plans will cover all or a portion of treatment as an out-of-network service, and we will provide the documentation needed to support your claim. CareCredit financing is available for patients who need to manage costs over time. Active and former military with a valid ID or DD-214, and first responders with a badge, receive a 25 percent discount. We discuss the full financial picture with every patient before any treatment decision is made. If you have additional questions about what to expect, our ketamine FAQs page covers many of the most common concerns patients bring to us.
Frequently Asked Questions
Why does my neuropathy get worse at night? Several factors converge at night to intensify neuropathic symptoms. Reduced distraction means pain signals receive more attentional focus. Cooler temperatures at night can affect nerve excitability. And the horizontal position of sleep alters circulation patterns in ways that affect peripheral nerve blood supply. Many patients find that elevated foot positioning and warm bedding provide partial relief, though these are management strategies rather than treatments for the underlying condition.
Can stress actually make nerve pain worse? Yes. Stress activates the sympathetic nervous system, which affects blood vessel tone, inflammation, and nerve excitability. The physiological connection between psychological stress and peripheral neuropathy symptom intensity is real — stress-related neuropathy worsening is not simply a matter of paying more attention to pain when you are anxious.
Will avoiding triggers eventually reduce my neuropathy? Trigger avoidance can reduce the frequency and severity of flares, but it does not address the underlying nerve damage or the central sensitization that develops in long-standing neuropathy. Managing triggers is a useful component of a comprehensive approach, but patients who rely solely on avoidance often find that their list of triggers expands over time as central sensitization progresses.
Is IV ketamine a long-term treatment or a one-time procedure? IV ketamine for chronic pain is typically approached as a series of infusions rather than a single treatment, with the possibility of maintenance infusions for patients who respond well. The frequency of maintenance varies by individual — some patients go several months between infusions, while others benefit from more frequent treatment. We discuss realistic long-term expectations during your consultation.
How do I know if central sensitization is contributing to my neuropathy? Signs that central sensitization may be a significant factor include pain that has spread beyond the original affected area, sensitivity to stimuli that would not normally cause pain (such as light touch or mild temperature changes), and progressive lowering of the threshold for flares over time. A clinical evaluation can help clarify the extent to which central sensitization is driving your symptoms.
Key Takeaways
- Neuropathic pain flares are driven by the instability of damaged nerve fibers, which misfire in response to physiological variables including blood glucose changes, temperature, circulatory factors, overexertion, alcohol, sleep deprivation, and stress.
- Central sensitization — a state in which the central nervous system becomes amplified in its pain processing — develops in long-standing neuropathy and partly sustains flares independently of peripheral triggers.
- Standard neuropathy medications address nerve excitability and monoamine pathways but do not directly target the NMDA receptor-mediated central sensitization that drives the most treatment-resistant presentations.
- IV ketamine blocks NMDA receptors in the glutamate system, offering a mechanistically distinct approach specifically relevant to central sensitization; results vary by individual.
- At Awakenings in Toledo, we offer free initial consultations for patients with treatment-resistant neuropathic pain; our team combines expertise in anesthesiology, pain management, and behavioral health.
Neuropathic flares that are becoming more frequent, more severe, or harder to manage with current treatment are a clinical signal that the current approach is not reaching all the mechanisms driving your pain. At Awakenings by Northwest Ohio Ketamine in Toledo, our team will evaluate your full history and give you a direct assessment of whether IV ketamine infusion therapy may offer a more effective path. Call us at 419-406-4263 or schedule a free consultation through our contact page today.
References
National Institute of Neurological Disorders and Stroke. Peripheral Neuropathy. https://www.ninds.nih.gov/health-information/disorders/peripheral-neuropathy
Research on ketamine for chronic pain via NMDA receptor action. https://www.ncbi.nlm.nih.gov/books/NBK539824/
Medical Disclaimer
The information in this blog is for educational purposes only and does not constitute medical advice. IV ketamine infusion therapy for neuropathic pain should only be considered under the supervision of a qualified medical provider familiar with your full medical history and prior treatment responses. Individual results vary. If you are experiencing a medical emergency, please call 911 or go to your nearest emergency room.