Spinal stenosis is a condition in which the spinal column narrows and starts compressing the spinal cord. This process is typically gradual presents with your symptom...other common cause is herniated disc... Injury or weakness can cause the inner portion of the disk to break through the outer portion cause nerve injury... Consult nearest orthopedic surgeon if you have associated back pain or consult nearest neuro physician for clinical examination and for relevant investigations they will do the needful.