Unfortunately, when the disk is damaged, you may be close core of the loop and the formation of a hernia. This is not the hernia is directly responsible for the pain, but is compressed nerve root.
Back pain after physical exertion can cause violent back pain also qualified with the involvement of the muscles and ligaments lumbar region. Can reduce the muscles and ligaments and then cause back pain.
Change the size of the spinal canal
Spinal canal is too narrow or too wide, is also responsible for back pain. In most cases, it is shrinking due to osteoporosis of the bone, which is building within the channel and pressure on the nerve roots. People who have back pain when walking and obliged to stop to sit are definitely in this category.