What Is Diabetic Neuropathy? Nerve Damage Explained Simply

Nerves are like electrical wiring running throughout your body, carrying sensation signals — temperature, pain, touch — between your brain and your limbs, and carrying automatic commands to organs like the heart, stomach, and bladder.

Because nerve fibers rely on a network of microscopic blood vessels for oxygen and nutrients, Mayo Clinic (opens in a new tab) explains that prolonged high blood sugar can gradually injure nerve fibers directly and weaken the walls of the small capillaries that supply them, reducing blood flow to nerve endings over time. The result is what's known as diabetic neuropathy — a term that actually covers a few related patterns of nerve involvement, though one type is far more common than the others.

The Main Types of Diabetic Neuropathy

• Peripheral neuropathy (most common): affects the longest nerves first, typically in the feet and lower legs, gradually moving upward and sometimes eventually involving the hands in a 'glove-and-stocking' pattern.
• Autonomic neuropathy: affects nerves controlling automatic body functions — digestion, heart rate, bladder control, or blood pressure regulation on standing. This type is less commonly discussed but is worth mentioning if you notice new digestive changes, dizziness on standing, or unusual heart rate patterns.
• Focal neuropathy: a less common, usually temporary form affecting a single nerve, such as sudden double vision or a drooping eyelid, which often improves over weeks to months.

Why Neuropathy Starts in the Toes and Feet

Diabetic peripheral neuropathy follows a classic 'glove-and-stocking' pattern for a simple structural reason: the nerves extending to your toes and feet are the longest in your body, so their delicate blood supply is affected first, before symptoms move up toward the ankles, legs, and eventually the hands. This is also why neuropathy is often symmetrical, affecting both feet at roughly the same time and to a similar degree, rather than showing up in just one foot.

Common Symptoms of Peripheral Neuropathy

• Tingling or 'pins and needles': feeling like your feet are asleep even without having sat in one position.
• Burning discomfort: mild to sharp burning sensations, often more noticeable at night in bed.
• Hypersensitivity: lightweight bedsheets or socks feeling uncomfortable against your skin.
• Gradual numbness: reduced ability to feel temperature changes, sharp objects, or small stones inside shoes — this is usually the most consequential symptom for foot safety.

How Neuropathy Is Screened and Diagnosed

According to the ADA's Standards of Care (opens in a new tab), everyone with diabetes should be screened for peripheral neuropathy at least once a year using simple, painless clinic tests: a 10-gram monofilament (a thin fiber pressed lightly against the skin to check protective sensation) combined with at least one other test such as a vibration check with a tuning fork, pinprick sensation, or an ankle reflex check. None of these require special equipment beyond what a general physician's office typically has on hand.

How to Protect and Support Nerve Health

1. 1Keep blood sugar in your target range most of the time: stable glucose reduces further strain on the blood vessels that feed nerve fibers, and is the single most protective factor against neuropathy progressing.
2. 2Protect feet with proper, cushioned shoes and avoid walking barefoot indoors or outdoors, since reduced sensation removes your body's early-warning system for minor injuries.
3. 3Discuss symptom treatment with your doctor: medications such as pregabalin, gabapentin, or duloxetine can meaningfully ease burning or tingling discomfort, even though they don't reverse nerve damage itself.
4. 4Ask about vitamin B12 levels, especially with long-term metformin use, which can occasionally lower B12 absorption and contribute to nerve symptoms that mimic diabetic neuropathy.
5. 5Limit alcohol intake, since alcohol can independently contribute to nerve irritation and can compound diabetes-related nerve changes.
6. 6Move regularly during the day: gentle daily activity supports circulation to the lower legs and feet, complementing the effect of stable glucose on nerve blood supply.

“Stable blood sugar gives your nerve blood vessels the environment they need to protect nerve fibers — and annual screening catches changes long before symptoms become disruptive.”

Track tingling or numbness symptoms

Log any nerve discomfort notes in Diatic to discuss patterns with your doctor during visits.

Log a reading (opens Diatic on Google Play in a new tab)