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Causes of Lower Back Pain on Left Side. A variety of problems can result in lower back pain. Some are common strains and overuse type injuries while others are serious and potentially life threatening. It is a good idea to visit your doctor who can fully examine you and evaluate for a potentially more serious cause.
Some of these causes include. 1  Gas in colon (Splenic Flexure Syndrome) â Excessive amount of gas formed and trapped in the colon can cause pain in the upper left side of the abdomen and this area is felt below the left rib cage. Pain and discomfort under left rib cage may be experienced after consumption of food.