No single cause for lower back pain can be defined in isolation. It is because the types of back pains are many. Understand the pain in its proper perspective, and then decide about the type of treatment that you intend to pursue.
In the USA, the survey reports indicate that four out of five adults experience back pain at one time or the other during their lives.
Your back is such a big area, and the pain could be in any part. But the severity of the pain has nothing to do with the damage you have suffered. A small strain, can give you unbearable pain. A big muscle-wound may not do much of the damage.
Your back is a long rectangular park. Many body parts are covered under its flat area. Any disturbed area can generate pain. Plus, there are many parts of the spinal anatomy which can cause a great amount of pain!
In the lower portion of the back, there is a cluster of nerve roots that go to the arms and legs. Any irritation there causes lower back pain. It is usually due to the irritation in the smaller nerves that innervate the spine in the lower portion of the back. Muscles may be strained. There could be injuries of joints, bones, ligaments and...