Synopsis
Recognise metabolic and alcohol-related nerve injury, prevent ulceration and autonomic harm, address nutrition and dependence, and treat pain without overlooking an atypical second neuropathy.
- Distal symmetrical diabetic polyneuropathy usually begins in toes with sensory loss, burning or allodynia, spreads proximally and later affects hands when leg involvement is advanced.
- Loss of protective sensation may be painless and is more dangerous than pain: inspect feet, pulses, skin, deformity and footwear and place risk into the NICE diabetic-foot pathway.
- Diabetes also causes autonomic neuropathy, entrapment neuropathies, radiculoplexus neuropathy and cranial mononeuropathies; asymmetry or proximal wasting is not routine stocking neuropathy.
- Optimise glucose safely and manage blood pressure, lipids, smoking, renal disease and weight, but explain that established axonal loss may not reverse quickly.
- Very rapid improvement in chronic severe hyperglycaemia can rarely precipitate treatment-induced painful and autonomic neuropathy, so severe new pain after a large HbA1c fall deserves review.
- Alcohol-related neuropathy reflects direct toxicity plus thiamine and other nutritional deficiencies, liver disease and social factors; quantify intake and dietary adequacy non-judgementally.
- Give parenteral thiamine for suspected Wernicke encephalopathy or high-risk acute illness and follow the alcohol pathway; oral replacement alone is not adequate for Wernicke disease.
- For neuropathic pain, NICE initial options are amitriptyline, duloxetine, gabapentin or pregabalin, chosen by comorbidity, function, misuse risk and patient preference.
- Do not anchor on diabetes or alcohol when weakness is rapid, asymmetrical, proximal or demyelinating, because B12 deficiency, CIDP, vasculitis, compression and medicines may coexist.
Key red flags
Inability to detect monofilament pressure, temperature or injury identifies ulcer risk even if the patient reports no neuropathic pain.
A unilateral hot, red or swollen foot with neuropathy, sometimes after minor trauma and with little pain, needs immediate offloading and specialist diabetic-foot assessment.
Marked proximal weakness, rapid progression, upper-limb-first disease, asymmetry or generalized demyelinating findings should prompt investigation beyond diabetes or alcohol attribution.
Investigation priorities
Detect ulceration, callus, deformity, infection, ischaemia and loss of protective sensation and assign risk.
Management branches
Diabetes or alcohol-related sensory loss affects the feet.
- Inspect bare feet, interdigital spaces, nails, callus, deformity, temperature and footwear, assess pulses and protective sensation and ask about prior ulcer or amputation.
- Refer ulcer, infection, ischaemia or suspected active Charcot change at the urgency specified by the NICE diabetic-foot pathway and offload where advised.
- Provide daily self-inspection, washing, moisturising away from toe spaces, footwear and thermal-injury advice adapted to vision and dexterity.
- Arrange podiatry and risk-based surveillance, ensuring pain improvement never substitutes for ongoing protective care.