The Sacro-Iliac joint is a common cause of lower back pain due to the large amount of force it has to cope with, patients often get this joint confused with the hip as it is quite low and slightly to the side of the spine. Front view: Pain that originally starts in this region often spreads across the whole of the lower back, this is because inflammation is a very clever but also very crude system. When the inflammatory process starts, it essentially dumps inflammatory chemic