Spinal stenosis is a condition where the spaces in your spine become narrower. Your spine has a tunnel called the spinal canal, which holds your spinal cord. When the space in this canal shrinks, it can put pressure on your spinal cord and the nerves that branch off from it, causing pain, numbness and other problems with your nerves.
When the spinal canal gets too tight, it can irritate or pinch your spinal cord or nerves, which often leads to back pain or conditions like sciatica (pain that travels down your legs). Spinal stenosis can happen for several reasons, including age-related changes, injuries or conditions that affect the spine.
While anyone can develop spinal stenosis, it’s most common in people over 50 years old, as the spine naturally changes and wears down over time.
Spinal stenosis most often affects two areas of your spine:
- Lower back (lumbar spinal stenosis): The lower back is made up of five large vertebrae (bones) that support most of your body’s weight. If the space in this area narrows, it can cause pain or weakness in your lower back and legs.
- Neck (cervical spinal stenosis): The neck has seven vertebrae. When the space here shrinks, it can cause pain or numbness in the neck, shoulders, arms and hands, and may even make it harder to walk or maintain balance.