What is Peripheral Neuropathy?

Peripheral neuropathy is a condition that affects the peripheral nerves, which are the nerves outside the brain and spinal cord. These nerves carry signals for sensation, movement, pain, temperature, balance, and automatic body functions.

Peripheral neuropathy may affect one nerve, called mononeuropathy, several nerves, called multifocal neuropathy, or many nerves throughout the body, called polyneuropathy. It may involve sensory nerves, motor nerves, or autonomic nerves. Sensory nerves help with feeling, motor nerves control muscle movement, and autonomic nerves help regulate functions such as sweating, blood pressure, digestion, and bladder control.

De Novo Brain & Spine evaluates adult patients with peripheral nerve symptoms to help determine whether symptoms may be related to focal nerve compression, peripheral nerve injury, spine-related nerve root compression, or another neurological condition. Peripheral neuropathy is often managed medically, but neurosurgical evaluation may be appropriate when symptoms suggest nerve compression, a structural lesion, progressive weakness, or a surgically treatable peripheral nerve problem.

Common Signs and Symptoms

Peripheral neuropathy symptoms depend on which nerves are affected, how severe the nerve injury is, and whether the condition involves sensory, motor, or autonomic nerves. Symptoms often begin in the feet or hands, but the pattern can vary.

Common signs and symptoms may include:

• Numbness or reduced sensation in the feet, toes, hands, or fingers
• Tingling, pins-and-needles sensations, or prickling
• Burning, shooting, stabbing, or electric-like pain
• Increased sensitivity to touch
• Pain that is worse at night
• Muscle weakness
• Cramping, twitching, or loss of muscle bulk in some cases
• Balance problems or trouble walking
• Feeling unsteady in the dark or on uneven ground
• Foot drop or difficulty lifting the front of the foot in selected nerve injuries
• Loss of coordination or difficulty with fine hand movements
• Reduced ability to feel temperature, vibration, or injury
• Foot sores, wounds, or infections in patients with loss of protective sensation
• Dizziness, sweating changes, bowel changes, bladder symptoms, or blood pressure changes when autonomic nerves are involved

Seek prompt medical evaluation for new or progressive weakness, foot drop, rapidly worsening numbness, severe nerve pain, loss of balance, falls, new bowel or bladder problems, or symptoms that begin suddenly. Seek emergency medical care or call 911 for sudden weakness, sudden speech difficulty, facial drooping, loss of consciousness, or other stroke-like symptoms.

What Causes This Condition?

Peripheral neuropathy can have many causes. Sometimes the cause is clear, and sometimes no specific cause is found even after evaluation. A diagnosis of peripheral neuropathy does not usually mean that the patient did something to cause it.

Possible causes and risk factors may include:

• Diabetes, one of the most common causes of peripheral neuropathy
• Prediabetes or metabolic syndrome in some patients
• Vitamin deficiencies, especially vitamin B12 deficiency
• Kidney disease
• Thyroid disease
• Autoimmune or inflammatory conditions
• Infections that affect nerves in selected cases
• Chemotherapy or certain medications that can affect nerve health
• Alcohol-related nerve injury
• Toxin or heavy metal exposure in selected cases
• Hereditary neuropathy, such as Charcot-Marie-Tooth disease
• Trauma or nerve injury
• Repetitive pressure or nerve compression
• Carpal tunnel syndrome, ulnar neuropathy, peroneal neuropathy, or other focal nerve entrapments
• Spine-related nerve root compression, such as cervical radiculopathy or lumbar radiculopathy, which can mimic or overlap with neuropathy symptoms
• Idiopathic neuropathy, meaning no clear cause is identified

These are causes or risk factors, not guarantees that peripheral neuropathy will occur. Treatment planning depends on the suspected cause, symptom pattern, neurological examination, electrodiagnostic findings, lab results, imaging findings when needed, and the patient’s overall health.

How It Is Diagnosed?

Peripheral neuropathy is diagnosed through medical history, neurological examination, and testing when appropriate. The evaluation helps determine whether symptoms are caused by polyneuropathy, focal nerve compression, nerve root compression, or another neurological condition.

Common diagnostic steps may include:

• Medical history and symptom review to understand numbness, tingling, pain, weakness, balance problems, medication history, diabetes history, alcohol use, toxin exposure, family history, and symptom pattern
• Neurological examination to evaluate sensation, strength, reflexes, coordination, gait, balance, vibration sense, temperature sensation, and muscle bulk
• Foot and skin examination when loss of sensation or diabetic neuropathy is suspected
• Electromyography, also called EMG, to evaluate muscle and nerve function when needed
• Nerve conduction studies, also called NCS, to measure how well peripheral nerves carry electrical signals
• Blood tests to evaluate possible causes such as diabetes, vitamin deficiency, thyroid disease, kidney disease, inflammation, infection, or autoimmune disease when appropriate
• Skin biopsy in selected cases when small fiber neuropathy is suspected
• Autonomic testing in selected cases when symptoms involve sweating, blood pressure, heart rate, digestion, or bladder function
• Ultrasound or MRI of a peripheral nerve in selected cases when focal nerve compression, nerve swelling, cyst, mass, or nerve injury is suspected
• Cervical or lumbar spine imaging in selected cases when symptoms may be related to radiculopathy or spinal nerve compression
• Nerve biopsy only in selected cases when diagnosis remains unclear and results may change treatment planning

The goal of diagnosis is to identify the type of neuropathy, determine whether there is a treatable cause, separate generalized neuropathy from focal nerve compression, and decide whether medical care, rehabilitation, pain management, or surgical evaluation may be appropriate.

Treatment Options

Peripheral neuropathy treatment depends on the cause, nerve type involved, symptom severity, pain level, weakness, balance problems, electrodiagnostic findings, medical conditions, and the patient’s overall health. Not every patient with peripheral neuropathy needs surgery.

Treatment options may include:

• Treatment of the underlying cause when one is identified, such as diabetes, vitamin deficiency, thyroid disease, autoimmune disease, infection, medication effect, or toxin exposure
• Blood sugar management in patients with diabetic neuropathy or diabetes-related nerve damage
• Vitamin replacement when a deficiency, such as vitamin B12 deficiency, is confirmed
• Medication for nerve pain, such as neuropathic pain medication when medically appropriate
• Topical pain treatments in selected cases for localized nerve pain
• Physical therapy to improve balance, strength, walking safety, flexibility, and fall prevention
• Occupational therapy to help with hand function, daily activities, and safety strategies
• Bracing or orthotics, such as an ankle-foot orthosis, when weakness or foot drop affects walking
• Foot care and skin protection when loss of sensation increases the risk of wounds, ulcers, or infection
• Activity modification to reduce nerve irritation or repetitive pressure
• Treatment of focal nerve compression, such as carpal tunnel syndrome, ulnar neuropathy, or peroneal neuropathy, when symptoms and testing support a specific entrapment site
• Peripheral nerve decompression surgery in selected cases when a focal nerve compression is significant, progressive, or not improving with appropriate conservative care
• Evaluation of nerve tumors, cysts, or masses when imaging suggests a structural cause of nerve symptoms
• Spinal cord stimulation or other neuromodulation discussion in selected patients with chronic refractory neuropathic pain after specialist evaluation
• Follow-up care to monitor pain, strength, sensation, balance, gait safety, and function over time

Neurosurgical treatment may be considered when peripheral neuropathy symptoms are related to a focal nerve entrapment, structural compression, nerve injury, nerve sheath tumor, or spine-related nerve root compression. When neuropathy is caused by diabetes, autoimmune disease, vitamin deficiency, medication effect, or another medical condition, treatment usually focuses on medical management and symptom control.