There are many causes of pain in the back. Symptoms in the low back can be a result of problems in the bony lumbar spine, discs between the vertebrae, ligaments around the spine and discs, spinal cord and nerves, muscles of the low back, internal organs of the pelvis and abdomen, and the skin covering the lumbar area. Pains in the upper back can also be a result of disorders of the aorta, chest tumors, and inflammation of spine. Common causes of lower back pain include strain injury from athletics or overuse, disc herniation, kidney infection, and pregnancy. Less common causes of back pain include infection of the spine, ankylosing spondylitis, and cancer in the bone of the spine. Symptoms that can be associated with back pain include dull ache, numbness, tingling, sharp pain, pulsating pain, pain with movement of the spine, muscle spasm, tenderness, sciatica with shooting pain down one or both lower extremities, rash, and loss of continence of bowel or bladder.