There are many diseases that can cause soreness in the left hip bone. If the soreness persists and does not ease for a long time, it is still advisable to go to hospital for a check-up. Prolonged weight bearing, chronic strain, overexertion and cold can damage and irritate the left hip bone area, leading to the soreness and pain. In addition, synovitis, bursitis and femoral head necrosis of the hip joint may also cause soreness, as may herniated lumbar discs and ankylosing spondylitis.