Uremic Neuropathy

How kidney failure damages nerves

When the kidneys fail, substances normally filtered out accumulate in the blood. These uremic toxins, together with high potassium levels and other metabolic changes, disrupt the electrical activity of nerve cells and damage the longest nerve fibers first. This is why symptoms start in the toes and feet, the ends of the longest nerves, and spread upward in a "stocking and glove" pattern.

It usually appears when kidney function is severely reduced, typically with an eGFR below about 15. Many people with diabetes and kidney failure also have diabetic neuropathy, and the two can be hard to separate. See peripheral neuropathy.

Symptoms

Sensory

• numbness, tingling or pins and needles in the toes and feet, later the hands
• burning pain in the feet, often worse at night (burning feet)
• reduced sense of vibration and position, leading to unsteadiness
• reduced ability to feel injuries or temperature

Motor

• muscle cramps
• weakness of the feet and ankles, sometimes foot drop
• muscle wasting in advanced cases

Restless legs

Restless legs syndrome, an irresistible urge to move the legs at rest, worse in the evening, is very common in kidney failure and disrupts sleep.

Autonomic

Damage to automatic nerves can cause dizziness on standing, low blood pressure during dialysis, sweating changes, constipation and erectile dysfunction.

Other nerve problems in kidney failure

• Carpal tunnel syndrome: more common in long-term dialysis, partly from dialysis-related amyloid deposits.
• Ischemic monomelic neuropathy: a rare, sudden nerve injury in the arm after creation of a dialysis fistula or graft, causing pain, weakness and numbness of the hand; needs urgent surgical assessment.
• Ulnar neuropathy from pressure at the elbow.

Diagnosis

1. History and examination: pattern of numbness, reflexes (often reduced at the ankles), strength and balance.
2. Nerve conduction studies and electromyography: confirm a length-dependent sensorimotor axonal neuropathy.
3. Blood tests to rule out other causes: blood sugar and HbA1c, vitamin B12, thyroid function, protein studies.
4. Review of medicines: some drugs build up in kidney failure and cause neuropathy.

Treatment

Treating the kidney failure

• Adequate dialysis clears toxins and can stop progression and sometimes improve symptoms. Dialysis dose and frequency may be reviewed if neuropathy worsens.
• Potassium control through diet and dialysis.
• Kidney transplant is the most effective treatment; many people improve noticeably within months after a successful transplant.

Relieving symptoms

• Nerve pain medicines such as gabapentin or pregabalin, at reduced doses adjusted for kidney function by your doctor. Some medicines must be avoided or used with care in kidney failure.
• Restless legs: correct iron deficiency, review medicines that worsen symptoms, and use specific medicines as advised.
• Cramps: stretching, review of dialysis fluid removal and other measures.
• Physical therapy for strength and balance; ankle braces for foot drop.

Protecting the feet

• Check your feet daily for cuts, blisters or color changes.
• Wear well-fitting shoes and socks.
• Avoid hot water bottles and test bath water temperature.
• See a podiatrist regularly, especially with diabetes.

Outlook

Uremic neuropathy typically progresses slowly. It may stabilize with good dialysis and often improves after kidney transplantation, though severe, long-standing nerve damage may not fully recover. Early recognition and foot protection prevent complications such as ulcers and falls.

Frequently asked questions

What is uremic neuropathy?

Uremic neuropathy is nerve damage caused by toxins that build up when the kidneys fail. It usually starts with numbness, tingling or burning in the feet and can spread to the legs and hands, along with restless legs, cramps and weakness.

Can dialysis reverse uremic neuropathy?

Adequate dialysis can stabilize uremic neuropathy and sometimes improve symptoms, but it rarely reverses it completely. A successful kidney transplant is more effective and often leads to substantial improvement within months.

Why do my feet burn with kidney disease?

Burning feet in advanced kidney disease is often caused by uremic neuropathy, where toxins damage the long nerves to the feet. Diabetes, vitamin deficiencies and some medicines can contribute. A doctor can check the cause and suggest treatments that ease nerve pain.

Is restless legs syndrome common in kidney failure?

Yes. Restless legs syndrome is very common in people with advanced kidney disease and on dialysis. It causes an urge to move the legs, worse in the evening, and disturbs sleep. Correcting iron deficiency, optimizing dialysis and certain medicines can help, and it often improves after transplant.