The Trigger Point & Referred Pain Guide

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Myofascial Trigger Point Symptoms
Arms, Hands

Painful weak grip that may let go infraspinatus, scaleni, hand extensors (2nd picture) , brachioradialis
Thumb pain and tingling numbness Brachialis  entrapment of radial nerve, Adductor pollicis
Handwriting difficulties Adductor pollicis / Opponens pollicis
Problems holding arms up (as when folding sheets) Subscapularis, infraspinatus, Supraspinatus, upper trapezius, levator scapulae
Carpal tunnel-like pain in wrist (watchband area) Subscapularis