For some it's an acquired skill, hence, "Can you tell..." It's arguable that all pain is nerve pain because all pain is transmitted via nerves, but the difference lies in cause & source of pain. There are also perceptual differences in what is classified as muscle pain vs. nerve pain.

Nerve Pain vs. Muscle Pain: Understanding the Difference.

In some ways it's like differentiating between cervicogenic (stress-related) headache and migraine. I get both kinds, and while I can usually tell the difference, they sometimes fool me, and I can get both kinds simultaneously—a double whammy. Like nerve pain, migraines don't typically respond to headache meds—and verse-vicesa.

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