girl office worker holding her aching back from a chair, the concept of back pain in office workers, lactic acid in muscles and

ache acid arthritis arthrosis back backache backbone background body bone cancer chair concept girl health hernia holding hurt illness infection inflammation injury intervertebral lactic lumbago lumbar medical medicine muscles myofascial nerve office osteochondrosis pain person radiculitis rear red sciatic sciatica sick spine spondyloarthrosis spondylolisthesis stool symptom syndrome vertebra white woman worker young