T4 Syndrome (Upper Thoracic Syndrome)

Upper Back Causing Arm Numbness

Upper thoracic segmental dysfunction (typically T3-5) causing referred symptoms into the upper limb: diffuse arm aching, paraesthesia in the hand (often glove-like, non-dermatomal), and autonomic features (heaviness, swelling sensation). A clinical diagnosis, mechanism is debated. Responds well to thoracic manipulation.

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