You might be wounding how a Diagram and back pain are related. Sickness absence is mostly caused and commonly caused by back pain. Not really considered a serious illness but certainly painful. Lower back pain or 'Lumbago' affects around 70% or more people globally it may affect a person at least once a lifetime. Low back pain is a stiff pain starting from the back right from the bottom of the ribs and up to the top of the legs. It's also considered a probable symptom of damage incurred by the muscles or ligaments.