A normal EMG can miss very small nerve fibers

Routine nerve-conduction studies assess large fibers; small-fiber problems can cause burning despite normal results.

Small-fiber neuropathyBurning and altered temperature sensation can occur with normal routine nerve-conduction studies.
Diabetes or glucose intoleranceMetabolic disorders can affect nerves even before advanced diabetes.
Autoimmune or paraprotein-related neuropathyDryness, inflammatory symptoms or abnormal proteins can shape specialist investigation.
Vitamin B6 exposureHigh-dose supplements can contribute to sensory nerve injury.

Progressive weakness needs a fresh neurological examination

EMG findings need correlation with examination; new objective weakness or worsening balance changes the priority.

Large-fiber neuropathy or radiculopathyLoss of vibration, reflex changes or weakness may indicate a different pathway.
Central or other neurological disorderExamination may reveal findings that peripheral nerve tests cannot fully explain.
Small-fiber neuropathyBurning and altered temperature sensation can occur with normal routine nerve-conduction studies.
Autoimmune or paraprotein-related neuropathyDryness, inflammatory symptoms or abnormal proteins can shape specialist investigation.

Excess pyridoxine in some supplements may itself cause neuropathy and should be reviewed with a clinician.

Vitamin B6 exposureHigh-dose supplements can contribute to sensory nerve injury.
Small-fiber neuropathyBurning and altered temperature sensation can occur with normal routine nerve-conduction studies.
Diabetes or glucose intoleranceMetabolic disorders can affect nerves even before advanced diabetes.
Large-fiber neuropathy or radiculopathyLoss of vibration, reflex changes or weakness may indicate a different pathway.

Sweating, standing intolerance or dryness alongside burning may direct assessment toward small-fiber or systemic causes.

Autoimmune or paraprotein-related neuropathyDryness, inflammatory symptoms or abnormal proteins can shape specialist investigation.
Small-fiber neuropathyBurning and altered temperature sensation can occur with normal routine nerve-conduction studies.
Diabetes or glucose intoleranceMetabolic disorders can affect nerves even before advanced diabetes.
Central or other neurological disorderExamination may reveal findings that peripheral nerve tests cannot fully explain.