Polyneuropathy

Condition: Polyneuropathy

Brief Overview: Per UpToDate, “Polyneuropathy is a specific term that refers to a generalized, relatively homogeneous process affecting many peripheral nerves [the nerves outside the brain and spinal cord], with the distal nerves usually affected most prominently.” It commonly affects the feet and lower legs first and may eventually involve the hands. Patients may experience numbness, tingling, burning pain, weakness, or impaired balance. Some patients experience little or no pain despite significant loss of sensation.

Polyneuropathy may affect sensory nerves (sensation), motor nerves (muscle movement), and autonomic nerves (automatic functions such as blood pressure regulation, sweating, and digestion). Symptoms, treatment, and prognosis depend on the underlying cause and the type of nerves affected.

Prevalence: Polyneuropathy affects roughly 1–5% of the general adult population, rising steeply with age to 7–13% in those over 80. The precise figure depends heavily on the definition used (symptoms alone vs. confirmed with nerve conduction studies) and the population studied.

Etiology: Polyneuropathy results from injury to peripheral nerve:

Axons.
Myelin.
Nerve-cell bodies.
Small nerve fibers.
Large nerve fibers.
Or a combination of these structures.

Common causes include:

Diabetes mellitus.
Chronic kidney disease.
Vitamin B12 deficiency.
Excessive vitamin B6 exposure.
Other nutritional deficiencies.
Chronic excessive alcohol use.
Hypothyroidism.
Liver disease.
Autoimmune or inflammatory disorders.
Monoclonal gammopathies and certain blood disorders.
Certain infections.
Cancer and paraneoplastic conditions.
Chemotherapy.
Other neurotoxic medications.
Heavy-metal or toxin exposure.
Hereditary neuropathies.
Amyloidosis.

Some polyneuropathies are idiopathic, meaning a cause remains unknown despite evaluation.

Risk Factors: Depending on the cause, risk factors may include:

Increasing age.
Diabetes or prediabetes.
Long duration of diabetes.
Chronic kidney disease.
Excessive alcohol use.
Poor nutrition or malabsorption.
History of bariatric or gastrointestinal surgery.
Chemotherapy exposure.
Exposure to certain neurotoxic medications.
Family history of inherited neuropathy.
Autoimmune disease.
Certain cancers or blood disorders.
Exposure to heavy metals or other toxins.

Commonly Associated Conditions:

Diabetes mellitus.
Chronic kidney disease.
Vitamin B12 deficiency.
Thyroid disease.
Peripheral artery disease.
Alcohol-use disorder.
Autoimmune disorders.
Monoclonal gammopathy.
Amyloidosis.
Cancer or previous chemotherapy.
Hereditary neurological disorders.
Chronic pain.
Sleep disturbance.
Depression or anxiety related to chronic symptoms.
Gait impairment and recurrent falls.

Care Coordinator Note: Diabetes is common in this population, but neuropathy in a patient with diabetes should not automatically be assumed to be diabetic neuropathy. The 2026 ADA Standards emphasize that diabetic neuropathy is a diagnosis of exclusion and that other treatable neuropathies may coexist.

Common Medications: There is no single medication that treats all forms of polyneuropathy. Treatment depends on:

The underlying cause.
Whether the neuropathy can be reversed or slowed.
Whether the patient has neuropathic pain or other symptoms.

Common medications may include:

Gabapentin
Pregabalin
Duloxetine
Tricyclic antidepressants
Topicals – capsaicin, lidocaine-containing topicals
NSAIDs, low-dose tramadol
Vitamin replacement:
- Example: vitamin B12 replacement when deficiency is confirmed.
- Vitamin therapy should address a documented deficiency or specific clinical indication.
- More is not necessarily better: Excessive vitamin B6 can itself cause peripheral neuropathy.

⚠️ Gabapentin/Pregabalin Safety in Older Adults

The FDA warns that gabapentin and pregabalin can cause serious respiratory depression, particularly in:

Older adults.
Patients taking opioids.
Patients taking benzodiazepines or other CNS depressants.
Patients with COPD or other conditions that impair breathing.

Concerning symptoms include:

Extreme sleepiness.
Unusual confusion.
Severe dizziness.
Slow or shallow breathing.
Difficulty breathing.
Inability to awaken normally.

Follow appropriate emergency escalation procedures for significant respiratory symptoms or markedly decreased responsiveness.

⚠️ Key Points for Care Coordinators & Patients

Do not advise patients to start, stop, increase, decrease, or change the timing of any medication or supplement.
Ask whether neuropathy medication is being taken exactly as prescribed.
Ask about dizziness, sedation, confusion, edema, poor balance, or falls after medication changes.
Ask about opioid, benzodiazepine, sleep medication, or other sedating medication use when the patient takes gabapentin or pregabalin.
Ask whether kidney function has recently changed when a renally cleared medication is being used.
Ask about all vitamins and supplements, including vitamin B6.
Pain medications may decrease neuropathic pain but do not necessarily reverse the underlying nerve damage.
Report new or changing neurological symptoms to the patient's neurologist.

Common Labs, Imaging, and Tests:

EMG, nerve conduction studies
Labs:
- Serum glucose and glycohemoglobin
- Serum vitamin B12 level
- SPEP and UPEP with immunofixation
- Thyroid function tests
- Serum antinuclear antibodies
- Erythrocyte sedimentation rate and C-reactive protein
- Hepatitis screen
- Additional labs may be indicated
Lumbar puncture may be indicated
Genetic testing may be indicated
Skin biopsy may be indicated
Autonomic testing may be indicated
Quantitative sensory testing may be indicated

Common Symptoms: Symptoms depend on whether sensory, motor, or autonomic nerve fibers are affected.

Sensory Symptoms

Numbness.
Tingling.
"Pins and needles."
Burning.
Electric or shooting pain.
Stabbing pain.
Increased sensitivity to touch.
Pain from normally nonpainful touch, such as bedsheets.
Reduced ability to feel touch.
Reduced ability to feel vibration.
Reduced ability to feel heat or cold.
Reduced ability to feel pain.
Loss of awareness of foot position.

Symptoms often begin in the toes and feet before moving upward.

Motor Symptoms

Muscle weakness.
Muscle cramps.
Muscle twitching.
Muscle wasting.
Foot drop.
Difficulty climbing stairs.
Difficulty rising from a chair.
Difficulty using the hands.
Difficulty with fine-motor activities.

Balance and Gait Symptoms

Loss of sensation and position awareness may cause:

Unsteadiness.
Difficulty walking in the dark.
Difficulty walking on uneven surfaces.
Falls.
Near-falls.
Increased reliance on visual cues while walking.

Autonomic Symptoms

When autonomic nerves are affected, symptoms may include:

Dizziness or lightheadedness when standing.
Orthostatic hypotension.
Abnormal sweating.
Heat intolerance.
Constipation or diarrhea.
Gastroparesis or other digestive problems.
Urinary symptoms.
Sexual dysfunction.
Blurred vision related to autonomic dysfunction.

Common Treatments:

Medication (see above)
Treatment of any underlying disease
Physical, occupational therapy
Orthotics, assistive devices
Proper foot and nail care for patients with distal polyneuropathy

Physical Findings:

Reduced sensation to touch.
Reduced pinprick or temperature sensation.
Reduced vibration sensation.
Reduced proprioception.
Reduced or absent ankle reflexes.
Distal weakness.
Muscle atrophy.
Foot drop.
Abnormal gait.
Impaired balance.
Foot deformities.
Calluses.
Wounds or ulcers.

Potential Complications and Contraindications:

Falls and fall-related injury.
Foot wounds.
Burns or other injuries that are not initially felt.
Foot ulcers.
Infection.
Amputation in high-risk patients, especially when neuropathy coexists with diabetes and/or peripheral artery disease.
Progressive weakness.
Foot drop.
Loss of mobility.
Reduced independence.
Chronic neuropathic pain.
Sleep disturbance.
Autonomic dysfunction.
Medication-related sedation or falls.

Up to half of diabetic peripheral neuropathy cases may be asymptomatic. Loss of protective sensation can allow foot injuries to progress unnoticed, increasing the risk of ulceration and amputation.

Foot Care and Injury Prevention

This is especially important for patients with decreased sensation in the feet.

Encourage patients to:

Check feet every day for cuts, blisters, sores, redness, swelling, or other changes.
Use a mirror or caregiver assistance to inspect areas that are difficult to see.
Check inside shoes before putting them on.
Wear well-fitting shoes and socks.
Avoid walking barefoot, including inside the home.
Test bath water carefully before entering.
Avoid direct heating pads or hot-water bottles on numb areas.
Report wounds promptly.
Follow podiatry recommendations when appropriate.

Patients may be unable to feel a wound, burn, or other injury even when significant tissue damage is occurring.

For patients with diabetes, the ADA recommends at least annual comprehensive foot evaluation and more frequent inspection when sensory loss, previous ulceration, or other high-risk findings are present.

General Health and Lifestyle Guidance:

Take medications exactly as prescribed.
Maintain neurology and primary-care follow-up.
Manage diabetes according to the patient's individualized treatment plan when applicable.
Inspect numb feet daily.
Wear properly fitting footwear.
Avoid walking barefoot.
Avoid direct heat on areas with reduced sensation.
Maintain physical activity appropriate for the patient's abilities and medical conditions.
Use prescribed cane, walker, brace, or other assistive device.
Reduce fall hazards in the home.
Maintain adequate nutrition.
Avoid excessive alcohol use.
Review vitamins and supplements with the healthcare provider.
Do not take high-dose vitamin B6 specifically for "nerve health" without provider guidance.
Report new wounds or skin changes promptly.
Report new or worsening neurological symptoms to the neurologist.

Suggested Questions to Ask Patients:

Sensory Symptoms

Has the numbness or tingling changed since our last call?
Where are you experiencing symptoms?
Are both sides affected?
Have symptoms moved farther up your legs or into your hands?
Are you experiencing burning, shooting, or electric-like pain?
Is light touch painful?
Have you noticed reduced ability to feel hot or cold temperatures?

Strength and Function

Have you noticed any new weakness?
Are you having more difficulty climbing stairs?
Is it harder to stand from a chair?
Have you noticed your foot dragging?
Are you having difficulty using your hands or buttoning clothing?
Have your symptoms affected bathing, dressing, cooking, or other daily activities?

Balance and Falls

Are you feeling more unsteady?
Have you fallen or almost fallen since our last call?
Is walking more difficult in the dark or on uneven surfaces?
Are you using a cane, walker, or brace?
Do you feel safe walking around your home?

Foot Care

Are you checking your feet regularly?
Have you noticed any cuts, blisters, sores, redness, swelling, or drainage?
Are you able to see and reach the bottoms of your feet?
Do you need someone to help inspect them?
Are you having difficulty finding shoes that fit comfortably?
When was your last foot examination or podiatry visit?

Autonomic Symptoms

Do you feel dizzy or lightheaded when you stand?
Have you fainted or nearly fainted?
Have you noticed significant changes in sweating?
Are you having new constipation, diarrhea, or digestive problems?
Are you having any new urinary symptoms?

Medication Assessment

What medication are you taking for neuropathy or nerve pain?
Is it helping?
Are you taking it exactly as prescribed?
Have you experienced dizziness, excessive sleepiness, confusion, swelling, or falls?
Are you taking opioids, benzodiazepines, sleep medication, or other sedating medications?
Have any medications recently been started or changed?
Are you taking vitamins or supplements for your nerves?
Are you having difficulty obtaining your medications?

Follow-Up

When did you last see your neurologist?
When is your next neurology appointment?
Has your neurologist been informed about your current symptoms?
Have you had EMG/nerve conduction testing?
Are you working with physical or occupational therapy?
Do you feel your current treatment is adequately controlling your symptoms?

⚠️ Standard Neurology Symptom-Change Guidance

For any new neurologic symptom or change/worsening of an existing neurologic symptom, advise the patient or caregiver to contact the patient's neurologist to report the change.

Examples include new or worsening:

Numbness.
Tingling.
Neuropathic pain.
Weakness.
Foot drop.
Balance or walking difficulty.
Falls.
Autonomic symptoms.
Speech or swallowing difficulty.
Other neurological symptoms.

Care coordinators should not independently determine that a new or worsening neurological symptom is simply expected progression of the patient's established polyneuropathy.

If symptoms meet criteria for urgent or emergency evaluation, do not delay appropriate care while waiting for the neurologist to respond. Follow organizational escalation policies and direct the patient to the appropriate level of urgent or emergency evaluation.

⚠️ Telephone Escalation Guidance

Typical distal symmetric polyneuropathy usually develops gradually. Acute, rapidly progressive, markedly asymmetric, predominantly motor, or significant autonomic symptoms warrant more urgent evaluation.

Emergency — Follow 911/Emergency Protocol

Follow organizational emergency protocol for:

Sudden facial droop.
Sudden one-sided numbness or weakness.
Sudden speech or vision change.
New severe loss of balance or coordination.
New inability to walk.
Severe breathing difficulty.
New rapidly progressive weakness accompanied by difficulty breathing or swallowing.
Loss of consciousness.
Seizure.
Severe medication-related respiratory depression or inability to awaken normally.
Another acute neurological emergency.

Rapidly progressive peripheral weakness can occur in disorders such as Guillain-Barré syndrome, which may progress over hours or days and can impair breathing, heart rate, and blood-pressure control.

Do not assume sudden neurological symptoms are caused by the patient's chronic polyneuropathy.

Prompt/Same-Day Clinical or Neurology Escalation

Advise prompt clinical evaluation and notify the appropriate team according to organizational protocol for:

New or rapidly worsening weakness.
New foot drop.
Rapid spread of numbness or weakness.
Significant change in walking ability.
New recurrent falls.
New significant autonomic symptoms, such as recurrent fainting.
New bowel or bladder dysfunction accompanied by neurological symptoms.
Significant medication adverse effects.
New neurological symptoms after chemotherapy or another medication change.
A new foot wound, ulcer, drainage, spreading redness, or concern for infection.
Significant decline in ability to complete ADLs.

If symptoms meet criteria for emergency care, follow emergency protocol rather than waiting for neurology follow-up.

Suggested Talking Points:

Explaining polyneuropathy

"Polyneuropathy means that multiple nerves outside the brain and spinal cord aren't working normally. Depending on which nerves are affected, it can cause numbness, tingling, burning pain, weakness, balance problems, or other symptoms."

Discussing symptom changes

"We want your neurologist to know about any new symptom or noticeable change in your neuropathy. If something develops suddenly or is severe, we'll follow the appropriate urgent or emergency-care recommendations instead."

Discussing numbness

"Loss of feeling can sometimes be more important than pain because you may not notice a cut, blister, or burn. That's why checking numb areas—especially your feet—is important."

Discussing foot care

"If you can't feel your feet normally, check them every day even when they don't hurt. A sore or blister can be present without causing pain."

Discussing pain medication

"Nerve-pain medication can reduce symptoms, but it doesn't necessarily repair the damaged nerve. We also want to make sure the underlying reason for the neuropathy is being addressed when possible."

Discussing falls

"Neuropathy can affect your ability to feel where your feet are, which can make balance more difficult. Let us know about falls or near-falls so your healthcare team can reassess your safety and treatment."

Discussing medication effects

"Some nerve-pain medications can cause dizziness or sleepiness, particularly in older adults. If you notice those symptoms or start falling after a medication change, your healthcare provider should know."

Suggested SMART Goal Examples

1. Daily Foot Inspection
"I will check both feet for cuts, blisters, redness, swelling, or sores every evening for the next 30 days."

2. Foot Inspection Assistance
"My caregiver will help inspect the bottoms of my feet at least 5 days per week for the next month because I cannot see or reach them safely."

3. Medication Adherence
"I will take my neuropathy medication exactly as prescribed for the next 30 days and report side effects to my healthcare provider."

4. Symptom Tracking
"I will record changes in my numbness, tingling, pain, or weakness at least 3 days per week for the next 4 weeks to discuss with my neurologist."

5. Fall Prevention
"I will remove loose rugs and clutter from the main walking areas of my home within the next 7 days."

6. Assistive Device Use
"I will use my prescribed cane or walker during the activities recommended by my healthcare team for the next 30 days."

7. Protective Footwear
"I will wear properly fitting shoes or protective footwear whenever I am walking, including inside my home, for the next 30 days."

8. Neurology Follow-Up
"I will schedule and attend my recommended neurology appointment within the next ___ days."

9. Physical Therapy
"I will complete the balance or strengthening exercises recommended by my physical therapist ___ days per week for the next 4 weeks."

10. Diabetes Management
For a patient with diabetes:
"I will follow my prescribed glucose-monitoring and diabetes-treatment plan for the next 30 days and bring my readings to my next appointment."

11. Podiatry Follow-Up
When recommended:
"I will schedule and attend my recommended foot or podiatry examination by ___."

12. Home Safety
"I will add night-lights along the route between my bedroom and bathroom within the next 7 days to reduce my risk of falling."

Sources:

UpToDate: https://www.uptodate.com/contents/overview-of-polyneuropathy?search=polyneuropathy&source=search_result&selectedTitle=1~150&usage_type=default&display_rank=1&searchCorrelationId=7639acc5-1902-468f-be90-37aca4389dc3&searchCorrelationTerm=polyneuropathy
OpenEvidence. (2026). OpenEvidence Osler [Large language model]. https://www.openevidence.com
American Academy of Family Physicians — Peripheral Neuropathy: Evaluation and Differential Diagnosis, including prevalence, common causes, recommended laboratory evaluation, electrodiagnostic indications, and referral criteria.
National Institute of Neurological Disorders and Stroke — Peripheral Neuropathy, including sensory, motor, and autonomic manifestations, causes, and treatment.
American Diabetes Association — Standards of Care in Diabetes—2026: Retinopathy, Neuropathy, and Foot Care, including neuropathy treatment, foot-care recommendations, and medication classes for neuropathic pain.
American Academy of Neurology — Oral and Topical Treatment of Painful Diabetic Neuropathy Practice Guideline Update, including pharmacologic treatment and recommendation against opioid therapy.
U.S. Food and Drug Administration — Gabapentin and Pregabalin Drug Safety Communication, including respiratory-depression risk in older adults and patients taking other CNS depressants.
DailyMed — current prescribing information for pregabalin, duloxetine, and gabapentin, including renal dosing considerations.
Centers for Disease Control and Prevention — Diabetes and Foot Care, including daily foot inspection and injury prevention for patients with loss of sensation.
National Institute of Neurological Disorders and Stroke — Guillain-Barré Syndrome, including recognition of rapidly progressive weakness and respiratory involvement.
https://www.merckmanuals.com/professional/neurologic-disorders/peripheral-nervous-system-and-motor-unit-disorders/polyneuropathy
https://www.merckmanuals.com/home/brain-spinal-cord-and-nerve-disorders/peripheral-nerve-and-related-disorders/polyneuropathy

⚠️ Medical Disclaimer

This resource is provided for educational and informational purposes only and is not intended to replace professional medical advice, diagnosis, or treatment. The information presented is general in nature and may not apply to every individual or health situation.

Individuals should consult their physician or other qualified healthcare professional for personalized medical advice, diagnosis, or treatment recommendations related to their specific health conditions and should not begin any new exercise program or change their diet or medications without consulting their healthcare professional.

Call 911 if you are experiencing a medical emergency.