what are the causes of a bad back?
['Muscle or ligament strain. Repeated heavy lifting or a sudden awkward movement can strain back muscles and spinal ligaments. ... ', 'Bulging or ruptured disks. Disks act as cushions between the bones (vertebrae) in your spine. ... ', 'Arthritis. ... ', 'Skeletal irregularities. ... ', 'Osteoporosis.']