I was in a rear ened car accident in Oct 2008 and I felt shoulders and neck pain right after the accident. But in December of 2008, I started to have lower back pain, spasm and pain radiated down my leg. I also felt numbness on my feet, slowly my leg got weaker. By 2010, I finally got a CT scan and showed I have a herniated disc on L4/5 S1. I just wonder whether the accident has caused the herniated disc. Is it possible that lower back pain does not appear right away, but it appears weeks or months after the accident? Please help! Thanks