Spinal stenosis is the narrowing of your spinal canal and nerve root canal along with the enlargement of your facet joints. Most commonly it is caused by osteoarthritis and your body’s natural aging process. As the spinal canal narrows, there is less room for your nerves to branch out and move freely. As a result, they may become swollen and inflamed, which can cause pain, cramping, numbness or weakness in your legs, back, neck, or arms. Mild to moderate symptoms can be relieved with medications, physical therapy and spinal injections. Severe symptoms may require surgery.