A sore back can be a sign of the following diseases: 1. Fasciitis of the back. Myofasciitis of the back is usually caused by the muscles of the back or shoulder back working hard for a long time. 2, misalignment of the small joints of the thoracic spine, compression of the nerves in the back, soreness and swelling of the back or nerve pulling pain, numbness, usually accompanied by pain or activity dysfunction of the thoracic spine. 3, cervical spondylosis, degenerative changes in the cervical spine compression of the nerve roots of the shoulder and back, there will also be soreness and swelling of the back, or have nerve numbness, weakness and other symptoms. If there is a sore feeling in the left back, accompanied by chest tightness and palpitations, there may be a heart problem. If there is soreness and pain in the right back, accompanied by pain in the right upper abdomen, it may be caused by cholecystitis.