The thoracic spine consists of 12 vertebrae. It is located between the cervical spine (neck) and lumbar spine (low back), in the section of your body where the ribs attach. This part of the spine is often the culprit of bad posture. Over time and with weakened muscles and more porous bones, the thoracic spine can round forward creating a hunched upper back. This can lead to pain and potentially compression fractures, particularly in people with osteoporosis.