Spinal stenosis - National Library of Medicine - PubMed Health: "Symptoms include:
Numbness, cramping, or pain in the back, buttocks, thighs, or calves, or in the neck, shoulders, or arms
Weakness of part of a leg or arm
Symptoms are more likely to be present or get worse when you stand or walk. They will often lessen or disappear when you sit down or lean forward. Most people with spinal stenosis cannot walk for a long period of time."
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