Alcoholic polyneuropathy is one of the most common neurological complications of chronic alcohol intoxication: peripheral nerves stop conducting signals properly, and the person begins to feel numbness, burning, or weakness in the legs. Understanding the mechanism is useful at least because it determines how early the problem can be noticed.
What alcoholic polyneuropathy is
This refers to damage to the peripheral nervous system that develops in the late stages of alcoholism and occurs in 10–30% of individuals who chronically abuse alcoholic beverages, more often in men. According to electroneuromyography data, asymptomatic forms are found in 97–100% of patients with chronic alcoholism. Polyneuropathy develops five times more often than damage to the central nervous system.
Why alcohol damages nerves
The nerve fiber is affected first (axonopathy), and then its sheath (secondary demyelination). Ethanol damages nerves through increased lipid peroxidation, reduced antioxidant defense, and glutamate cytotoxicity. The second mechanism is a deficiency of B-group vitamins, folic acid, and vitamin E: ethanol interferes with the absorption of thiamine in the intestine and its conversion into the active form. Malnutrition, liver damage, and hyperglycemia against the background of alcoholic pancreatitis also play a role.
Symptoms of alcoholic neuropathy
The disease more often develops subacutely. Paresthesias appear in the distal parts of the limbs and tenderness in the calf muscles, which intensifies with compression of the muscles and pressure on the nerve trunks. Then weakness and paralyses are added, more pronounced in the legs; the foot extensors are predominantly affected, and atrophies develop rapidly in paretic muscles. Autonomic changes are possible: increased sweating, edema of the distal parts of the limbs, and impaired color and temperature of the limbs.
How the lower limbs are affected
Polyneuropathy begins with the longest nerves, so symptoms typically start in the feet and over time spread upward and later involve the hands. Sensory disturbances predominate over motor ones, and impairment of superficial sensation follows a “glove” and “stocking” pattern. Impaired deep sensation causes ataxic disorders, and in combination with loss of reflexes the picture resembles pseudotabes.
- numbness and tingling in the feet;
- burning, shooting pain in the legs;
- muscle weakness, especially in the feet;
- loss of balance and coordination;
- a non-healing sore or ulcer on the foot.
How alcoholic polyneuropathy is diagnosed
The doctor asks about symptoms and health history, examines you, and may order blood and urine tests to look for causes of nerve damage. Electroneuromyography is used to check the electrical activity of muscles, nerve conduction studies, nerve or skin biopsy, genetic testing, and lumbar puncture for cerebrospinal fluid analysis. If damage to the nervous system is suspected, the patient is referred to a neurologist: the earlier the diagnosis is made, the greater the chance of limiting the damage.
Complications and when a doctor's consultation is needed
Without eliminating the cause, the damage may remain persistent or gradually increase. A serious risk is a foot ulcer: if infected, gangrene may develop, and in severe cases amputation. The prognosis worsens when the cardiac branches of the vagus nerve and the phrenic nerve are involved. You should consult a doctor if there is pain, tingling, or loss of sensation in the feet, impaired balance, weakness, or a non-healing wound on the leg.
Polyneuropathy itself is not a reason to call an ambulance; 103 or 112 — if signs of a heart attack appear (sudden weakness, sweating, shortness of breath, nausea and vomiting) or fainting upon standing up. The point is that damage to the nerves of the heart and blood vessels can mask chest pain — the usual warning signal of a heart attack.
This material is for reference purposes: it helps to learn about the mechanism and signs, but does not replace consultation with a doctor.
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This content is for reference and does not replace a doctor's consultation. Medical disclaimer