Is there a relationship between multiple sclerosis and dysarthria?

Yes: Ms can affect virtually area of the central nervous system, and dysarthria is most commonly notice with lesions in the lower medulla oblongata close to cranial nerves nine and ten. Occasionally higher lesions can cause dysarthria, and these are associated with more vocal straining. The key lesson, treat acute changes immediately and use the newer more potent agents to prevent relapses.

Cause-effect: Damage to the brain from any cause (stroke, trauma, infection, ms, etc) may result in dysarthria. If the part of the brain that is responsible for articulation is damaged, whatever the cause, slurred speech (dysarthria) can result. This is just basic neuro-anatomy.