Loss of Vibration Sense

What vibration sense is and why doctors test it

Vibration is detected by fast-adapting receptors in the skin and around bones, called Pacinian corpuscles. Signals travel along large, insulated nerve fibers into the spinal cord and up the dorsal columns to the brain. The same pathway carries position sense (proprioception), which tells you where your feet are without looking. See position sense.

Long nerves are damaged first in most neuropathies, so the toes lose vibration sense before anywhere else. That makes the tuning fork test a simple early screen.

How the tuning fork test works

1. The doctor strikes a 128 Hz tuning fork and places it on your breastbone or wrist so you know what it feels like.
2. With your eyes closed, they place it on the bony top of the big toe joint.
3. You say when you feel the buzz and when it stops. The doctor compares this with their own finger or with your hand.
4. If you cannot feel it at the toe, they move up to the ankle, shin and knee to map how far the loss extends.

A graduated (Rydel-Seiffer) tuning fork gives a score from 0 to 8, and a biothesiometer measures the vibration threshold electronically. Nerve conduction studies confirm large-fiber nerve damage.

Causes of loss of vibration sense

Peripheral nerve causes

• Diabetes: diabetic peripheral neuropathy affects up to half of people with long-standing diabetes. Loss starts in the toes in a "stocking" pattern.
• Vitamin B12 deficiency: damages both peripheral nerves and the dorsal columns. Risk is higher with metformin, acid-reducing medicines, a vegan diet, pernicious anemia and stomach surgery. See vitamin B12 deficiency.
• Alcohol: heavy long-term drinking damages nerves directly and through poor nutrition.
• Chemotherapy: platinum drugs, taxanes, vincristine and bortezomib commonly cause neuropathy.
• Kidney failure, underactive thyroid and some autoimmune diseases.
• Inherited neuropathies such as Charcot-Marie-Tooth disease.
• Aging: vibration sense at the toes declines naturally after about 65, so mild reduction alone may be normal in older adults.

Spinal cord and brain causes

• Subacute combined degeneration from severe B12 deficiency or excess nitrous oxide use.
• Multiple sclerosis affecting the dorsal columns.
• Spinal cord compression from a disc, tumor or narrowing of the spinal canal.
• Neurosyphilis (tabes dorsalis) and Friedreich's ataxia, both rare.
• Stroke, which causes loss on one side of the body rather than in both feet.

Symptoms that often come with it

• Numbness or a feeling of walking on cotton wool
• Tingling, pins and needles or burning in the feet
• Balance problems, worse in the dark or with eyes closed, because position sense is also reduced
• Unnoticed cuts, blisters or burns on the feet

Tests for the cause

• Blood sugar and HbA1c
• Vitamin B12, sometimes with methylmalonic acid, and folate
• Kidney, liver and thyroid function
• Full blood count, and protein electrophoresis in older adults
• Nerve conduction studies
• MRI of the spine if signs point to the spinal cord

Treatment

Treatment targets the cause:

• Diabetes: better glucose control slows progression.
• B12 deficiency: injections or high-dose tablets. Early treatment can reverse symptoms, but long-standing damage may be permanent.
• Alcohol: stopping drinking and taking thiamine and a balanced diet.
• Chemotherapy: your oncologist may adjust the dose.

Nerve pain, if present, can be treated with medicines such as duloxetine, pregabalin or gabapentin, or amitriptyline, prescribed by a doctor.

Protecting your feet

Reduced sensation means injuries go unnoticed. Check your feet daily with a mirror, test bath water with your elbow, wear well-fitting shoes, never walk barefoot, and see a podiatrist regularly. People with diabetes should have a foot exam at least once a year.

Frequently asked questions

What does loss of vibration sense mean?

It means the large nerve fibers that carry vibration and position signals are not working normally. It is usually an early sign of peripheral neuropathy, most often from diabetes, but it can also point to vitamin B12 deficiency or a spinal cord problem.

Is loss of vibration sense normal with age?

Some reduction at the toes is common after about 65. However, complete loss, loss that extends up to the ankles or knees, or loss with other symptoms such as numbness, burning or unsteadiness should be investigated rather than put down to age.

Can vibration sense come back?

It depends on the cause. When B12 deficiency or a reversible compression is treated early, sensation can improve over months. Damage from long-standing diabetes or alcohol often does not fully recover, but treatment stops it getting worse.

Why is vibration sense tested in diabetes?

Loss of vibration sense identifies people whose feet are at higher risk of unnoticed injuries and ulcers. Diabetes foot checks combine it with a monofilament test, so preventive foot care can start early.