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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.
In men, a testicular infection, tumor or twisting of the left testicle commonly causes pain that radiates from the testicle into the left side of the abdomen and back. When to See Your Doctor Call your doctor right away if you develop abdominal and back pain, especially if it doesn't go away in a few days or worsens.