Small fiber neuropathy happens when the smallest nerve fibers in the body, the ones responsible for pain, temperature, and certain automatic body functions, become damaged. It often shows up as burning, tingling, or prickling sensations, usually starting in the feet. But what actually causes it? For many patients, the answer is not simple, and for some, it is never fully identified.
Common Causes of Small Fiber Neuropathy
Small fiber neuropathy can develop for a wide range of reasons, including:
- Diabetes or prediabetes. Elevated blood sugar over time is one of the most common identifiable causes.
- Autoimmune conditions. Disorders such as lupus, Sjogren’s syndrome, and celiac disease can affect nerve function.
- Vitamin deficiencies. Low levels of B12 or other key nutrients can contribute to nerve damage.
- Infections. Certain viral or bacterial infections have been linked to small fiber damage.
- Alcohol use and toxin exposure. These can affect nerve health over time.
- Genetic and connective tissue conditions. Inherited disorders, including some forms of Ehlers-Danlos syndrome, are increasingly recognized as a contributing factor.
- Idiopathic causes. In a significant number of cases, no clear cause is ever found, even after thorough testing.
The Ehlers-Danlos Syndrome Connection
Ehlers-Danlos syndrome (EDS) is a group of connective tissue disorders best known for joint hypermobility, stretchy skin, and tissue fragility. Researchers have observed that small fiber neuropathy appears more often in people with EDS than in the general population, though the exact relationship is still being studied. One theory is that the same connective tissue differences affecting joints and skin may also affect the tissue surrounding small nerve fibers.
If you have EDS or hypermobility and are also experiencing burning, tingling, or numbness, it may be worth mentioning both conditions to your provider, since they can be connected. The Ehlers-Danlos Society offers helpful background on EDS and its many associated symptoms, including nerve-related ones.
When to Talk to a Specialist
Because small fiber neuropathy has so many possible causes, an accurate diagnosis usually starts with a detailed history and targeted testing. If you would like a broader look at symptoms and diagnostic options, our overview of small fiber neuropathy is a good starting point.
Every case is different, and identifying the underlying cause is an important step toward a plan that fits your specific situation. Your provider can help determine which tests and next steps make sense for you.
This article is for general educational purposes only and is not a substitute for personalized medical advice. Please consult your healthcare provider regarding your individual symptoms and care.