nerve pain MedlinePlus.
Seek urgent help for emergency patterns
Call emergency services right away for chest pain, trouble breathing, fainting, sudden one-sided weakness or numbness, sudden trouble walking with confusion or speech changes, or a leg or foot that suddenly becomes very cold, pale, blue, or hard to move. These are not wait-and-see symptoms.
A quick checklist of warning signs
Use this list as a practical sorting tool, not as a way to name the cause yourself. The same visible sign can come from more than one condition, and a clinician may need an exam or tests to sort it
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