Lower left back pain with excrusheating pain down the leg?

Disc Herniation?: While sciatica is most commonly a result of a lumbar disc herniation directly pressing on the nerve, any cause of irritation or inflammation of the sciatic nerve can reproduce the symptoms of sciatica. This irritation of nerves as a result of an abnormal intervertebral disc is referred to as radiculopathy. Aside from a pinched nerve from a disc, other causes can occur.

Possible disc hernia: If pain is traveling into the leg and it is worse than your back pain, it may be due to a disc herniation especially if it hurts to cough or sneeze or to bear down when having a bowel movement.