The hip flexors are one of the most common indirect causes of low back pain that we see in our office. And this is because of where the hip flexors lie. The hip flexors originate from the front of the lumbar spine, travel down through the pelvis, and attach to the front of the hip joint. A lot of times when they are tight, they pull the spine into an into extension. This extension compresses the joints in the back of the spine, so a tight hip flexor can lead to low back pain.