Nearly everyone will have back pain at some point in life, but with sciatica, you'll know something is different immediately. Pain that begins in your back, travels down to your buttocks, and shoots down your leg is a classic sign of sciatica. The shooting pain down your leg is caused by compression on nerves exiting your spine. Even a tiny amount of pressure can cause tremendous pain, so getting rid of the inflammation and opening up space for the nerve is essential to start finding relief.
Pinching or compression on a spinal nerve can occur because of an injury to one of your spinal discs (such as disc herniation), the development of a bone spur, or ligaments that have increased in size. Either way, it's likely to cause pain and discomfort until you can decrease the inflammation, open up space for the nerve, or improve the movement of the spinal joint.