Whats lumbar spinal stenosis?

Narrowing. A narrowing or "pinching" of the nerve canal.
Let us help. Lumbar stenosis, the spinal nerve roots in the lower back are compressed, or choked, and this can produce symptoms of sciatica -- tingling, weakness or numbness that radiates from the low back and into the buttocks and legs -- especially with activity.
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A small spine canal. When the overall cross sectional area of the spinal canal in any region of the spine for the neural tissue to be compressed leading to clinical symptoms/findings. This can be:congenital basis, degenerative one with aging or a result of a acquired reason like: cyst, tumor, hematoma, abcess, fracture or disc hrniation or a combination of above. Not all people with small canals get symptoms.