Causes of Lumbar Spinal Stenosis

Lumbar spinal stenosis refers to narrowing of the lumbar spinal canal, neural foramina, and intervertebral foramina—regardless of cause—as well as reductions in spinal canal volume due to soft-tissue changes or intrinsic narrowing of the dural sac. These structural alterations collectively give rise to a constellation of low back and leg pain, along with various neurological symptoms, collectively termed lumbar spinal stenosis syndrome. So, what are the causes of lumbar spinal stenosis? Below, we address this question.

Causes of Lumbar Spinal Stenosis

1. Congenital Factors

Some individuals develop recurrent low back and leg pain at a relatively young age—even while maintaining an active lifestyle, healthy diet, and regular sleep schedule. In such cases, congenital lumbar spinal stenosis should be considered. Patients are advised to undergo radiographic imaging at a hospital for confirmation; imaging typically reveals either congenital spinal anomalies or developmental abnormalities of the spinal canal leading to stenosis.

2. Acquired (Traumatic) Factors

Acquired stenosis commonly results from external trauma. When traumatic forces damage the spine—particularly in severe injuries—spinal fractures or dislocations may occur. Such structural disruptions can subsequently lead to lumbar spinal stenosis.

3. Degenerative Factors

Lumbar spinal stenosis most frequently affects individuals aged 40–50 years. In some patients, stenosis arises secondary to age-related degeneration—for instance, degenerative changes in the spine that compromise its structural integrity and supportive function. This loss of stability may result in spondylolisthesis (vertebral slippage), which in turn contributes to lumbar spinal stenosis.

The above outlines the primary etiologies of lumbar spinal stenosis. We hope this information is helpful to you.