the body wall, e.g. left arm/hand pain, jaw pain.So the pain is "referred to" the related dermatomes of the same spinal segment.

Viruses that lie dormant in nerve ganglia (e.g. varicella zoster virus, which causes both chickenpox and shingles), often cause either pain, rash or both in a pattern defined by a dermatome (a zosteriform pattern). However, the symptoms may not appear across the entire dermatome.

Important dermatomes and anatomical landmarks

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