This really depends on the part of the back involved; I will confine my response to lower back pain, also called lumbar back pain.
In my experience low back pain in MS patients is infrequently a direct effect of Multiple Sclerosis but often a secondary complication of MS.
Remember, most of strain on your body from either prolonged sitting or standing is transmitted through the lumbar spine region. This make people in general very susceptible to mechanical low back pain.
Patients with MS are specially prone to this type of pain because of abnormal walking patterns, asymmetric truncal weakness, and improper seating support. These are the types of problems best evaluated by a rehabilitation specialists and an adaptive seating and technology specialist.
Rip Kinkel, MD
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