Stiff-Person Syndrome Home>Conditions_and_Diseases>Neurological_Disorders>Muscle_Diseases>Stiff-Person Syndrome     Web Pages MCW HealthLink An article about Stiff-person syndrome, a rare progressive neurological disorder. Stiff-Person Syndrome Information sheet compiled by National Institute of Neurological Disorders and Stroke. NORD: Stiff Person Syndrome Offers synonyms, a general discussion and further resources.