By lifting something too heavy or getting in an awkward movement or position, it leads to tension in the back muscles and spinal ligaments, leading to back pain.
By meeting an accident, like a car crash or a fall, the bones in the spine can break. Conditions like Spondylosis and Osteoporosis can be a result of trauma.
Function of the disc is to cushion the vertebrae i.e. the small spinal bones. You suffer from lower back pain when the disk presses on nerves or in old age when it flattens.
Several types of diseases and infections can too cause lower back pain. Diseases like kidney stones, abdominal aortic aneurysm and a few types of cancer.
The pain is caused by slipping of one of your vertebrae, bones of your spine, onto the vertebrae below it. This often leads to low back pain as well as leg pain.