A newly published meta-analysis confirms what leading nerve surgeons have long suspected: diabetes may physically enlarge nerves, which can increase the risk of nerve compression, pain, and dysfunction.
If you have been told your diabetic nerve pain is simply “part of diabetes,” this research suggests there may be more going on and, in some cases, more that can be done about it.
A 2026 meta-analysis reviewing 47 studies and more than 6,500 participants found that people with diabetes had measurably larger peripheral nerves, especially in the legs and feet. The study also found that nerve enlargement was more pronounced in patients with diabetic sensorimotor polyneuropathy, with the largest changes occurring at known compression sites such as the tibial nerve near the ankle and the median nerve near the wrist.
What This Means in Plain English
This research supports a simple and important idea:
- Diabetes can cause nerves to swell.
- Swollen nerves are more likely to get trapped in tight spaces.
- That compression may contribute to pain, numbness, tingling, and weakness.
In other words, some symptoms commonly blamed on “neuropathy” may also be related to nerve compression.
How Diabetes May Lead to Nerve Problems
Over time, high blood sugar can trigger metabolic and microvascular changes inside peripheral nerves. These changes may cause inflammation, fluid buildup, structural thickening, and nerve enlargement. As the nerve becomes larger, it can become more vulnerable to compression at naturally tight anatomical areas.
When that happens, patients may begin to notice symptoms such as:
- Burning pain
- Tingling
- Numbness
- Weakness
- Increased sensitivity in the feet or hands
What the Meta-Analysis Found
Because this paper is a meta-analysis, it is especially meaningful. Rather than looking at a single patient group, the researchers combined data from dozens of previously published studies to better evaluate the pattern of nerve enlargement in diabetes.
Key takeaways from the research include:
- Patients with diabetes had larger peripheral nerves than healthy controls.
- Patients with diabetic neuropathy had even greater nerve enlargement than diabetic patients without neuropathy.
- The most pronounced enlargement was found at distal compression sites, especially in the tibial nerve near the ankle and the median nerve near the wrist.
- The findings support the idea that nerve swelling and nerve compression may be part of the reason some diabetic patients develop neuropathy symptoms.
Why This Matters for Patients with Diabetic Neuropathy
Traditional treatment for diabetic neuropathy often focuses on blood sugar control and medications designed to reduce pain. While those approaches may be helpful, they do not always address whether a nerve is also being physically compressed.
This research supports a different question:
What if some diabetic nerve pain is not only caused by metabolic nerve damage, but also by pressure on an already swollen nerve?
If compression is part of the problem, identifying that compression may help explain why some patients continue to have pain, tingling, numbness, or balance issues even when their diabetes is reasonably well controlled.
Research That Supports the Dellon Theory
For years, Dr. A. Lee Dellon and others have proposed that diabetes can contribute to neuropathy symptoms through a three-step process:
- Diabetes causes nerve swelling.
- The swollen nerve becomes compressed at common entrapment sites.
- The compression contributes to the symptoms patients experience.
This newly published review adds meaningful evidence in support of that proposed mechanism.
Where Compression May Be Happening
The study found some of the largest differences in nerve size at common compression areas, including:
- The ankle / tarsal tunnel – often associated with foot pain, numbness, and burning
- The lower leg – where tibial nerve enlargement may contribute to progressive symptoms
- The wrist / carpal tunnel – where the median nerve may also be affected in diabetic patients
Notably, the tibial nerve showed some of the greatest enlargement in patients with diabetic neuropathy, making it an especially important area for evaluation.
Could Your Symptoms Be Related to Nerve Compression?
You may want to explore this possibility if you have:
- Burning, tingling, or numbness in your feet
- Symptoms that worsen at night
- Pain that seems to follow a specific path
- Ongoing symptoms despite treatment and glucose control
- Diabetic neuropathy symptoms that continue to progress
What This Means for Treatment
Not every patient with diabetes and nerve pain has a compressive nerve problem. However, this research supports the need to consider whether compression is contributing to symptoms in some patients.
That may involve:
- A focused clinical evaluation
- Assessment of common compression points
- Diagnostic imaging in select cases
- Discussion of treatment options tailored to the individual patient
For the right patient, understanding whether nerve compression is involved can provide a clearer path forward than simply trying to manage symptoms alone.
Download the Free Research Summary
We created a simple, patient-friendly summary of this newly published paper so you can better understand what the research says and why it matters. You can request your free copy by filling out the form at the top right of this page.
Download the free report to learn:
- How diabetes may cause nerves to swell
- Why swollen nerves may become compressed
- How nerve compression may contribute to neuropathy symptoms
- Why this research matters for patients seeking answers
Peripheral nerve enlargement in patients with diabetic sensorimotor polyneuropathy: A systematic review and meta-analysis: Nadine Boers, Brett Hahn, Anne Merijn Eligh, Isabel C. Jongen, Willem D. Rinkel, J.Henk Coert, Department of Plastic, Reconstructive, and Hand Surgery, Utrecht University Medical Center, Utrecht, the Netherlands Department of Plastic, Reconstructive and Hand Surgery, ZGT/MST, Twente, the Netherlands