Some common causes of Low Back Pain On many occasions you first feel back pain just after you lift a heavy object, move suddenly, sit in one position for a long time, sustain an injury or have been in an accident. Prior to that moment in time, there was often a pre-existing weakness, or loss of tissue integrity in your spinal structures. The specific structures in your back responsible for your pain are difficult to determine in many cases. Whether identified or not, there are several possible sources of low back pain:
Bulging or herniated discs
Injury or overuse of muscles, ligaments, facet joints, and the sacroiliac joints.
Muscle spasm (very tense muscles that remain contracted)
Degeneration of the discs
Poor alignment or fixations of the vertebrae
Spondylolisthesis
Osteoarthritis
Spinal stenosis (narrowing of the spinal canal)
Small fractures to the spine from osteoporosis
Strain or tears to the muscles or ligaments supporting the back
Spinal curvatures (like scoliosis or kyphosis), which may be inherited and seen in children or teens
Less Common Causes of Low Back Pain
Ankylosing spondylitis, which is a form of joint inflammation (arthritis) that most often affects the spine
Prostate Cancer
Bacterial infection, in which bacteria are often carried to the spine through the bloodstream from an infection somewhere else in the body or from IV drug use. However, bacteria can also enter the spine directly during surgery or injection treatments, or as the result of injury. Back pain may also be the result of an infection in the bone (osteomyelitis) or in the spinal cord (most often in the material covering the spinal cord, called an epidural infection).
Spinal tumors, or growths that develop on the bones and ligaments of the spine, on the spinal cord, or on nerve roots.
Paget's disease, which causes abnormal bone growth most often affecting the pelvis, spine, skull, chest, and legs.
Scheuermann's disease, in which one or more of the bones of the spine (vertebrae) develop wedge-shaped deformities. This causes curvature of the spine (rounding of the back, or kyphosis), most commonly in the chest region.


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