Rare neurologic disorder characterized by progressive rigidity and stiffness in truncal muscles, spasms, postural deformities, chronic pain, impaired mobility, and lumbar hyperlordosis
Stiff-person syndrome (SPS), also known as stiff-man syndrome, is a rare neurological disorder of unclear cause characterized by progressive muscular rigidity and stiffness. The stiffness primarily affects the truncal muscles and is characterised by spasms, resulting in postural deformities. Chronic pain, impaired mobility, and lumbar hyperlordosis are common symptoms. SPS occurs in about one in a... Wikipedia