With Parkinson’s disease, the rib cage gets stiff and flexes forward, causing a lack of rotation in the spine. This stiffness, compounded by the “lats” (the muscles in your back that attach to your arms) getting tethered down, causes difficulty when reaching and straightening your arms. When you can’t rotate in your upper back (thoracic spine), your body will start to compensate by rotating and extending parts of your body that are not meant to rotate. This almost always results in shoulder or back pain.
Furthermore, the eyes may have difficulty tracking a moving or stationary object or finding the next line in a book when reading.
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