lumbar muscle pain

What is Quadratus Lumborum Syndrome? Quadratus Lumborum Syndrome is a musculoskeletal condition caused by tightness, strain, or trigger points in the quadratus lumborum (QL) muscle, a deep muscle located on either side of the lower back. It frequently results in lower back, hip, or buttock pain, which can get worse when you sit, stand, bend,…