If you have lower back, hip or thigh pain it may be caused by sciatica. Sciatica is the name used for pain caused by your sciatic nerve. Your sciatic nerve runs from your spinal cord, to your buttocks and all the way down your legs to your feet. Your lower back pain can be caused by a herniated disk that is applying a constant pressure on your sciatic nerve. It can cause your muscles to have spasms, numbness, sharp stinging pain, and sometimes loss of movement of your legs. It can be quite painful if you suffer from any of the listed pains. Simple everyday tasks from walking to sitting can greatly alter the pain you feel.