The contractions caused by SPS typically make the afflicted area stiff and rigid. This can cause a sufferer to have difficulty walking, a general unsteadiness, a rigid posture, chronic pain, shortness of breath, changes in spinal alignment/spinal cord compression as well as psychological issues like anxiety and/or agoraphobia brought on by the physical symptoms. Symptoms that are less common are: eye movement issues that lead to double vision, speech problems, and issues with coordination.
