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Numbness in the 4th and 5th fingers is frequently associated with on that level: The C8-T1 level is at the very bottom of the neck almost where the upper back starts.

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When the neck joint (facet) connected to this level gets irritated, it refers pain to the upper back. 

 

One side or both feel abnormal to light touch or safety pin...

Feels equal or normal on both sides...