If the pain is caused by myofasciitis in the left back, you can usually take oral non-steroidal anti-inflammatory drugs to relieve the pain; in addition, you can apply local ointment to relieve swelling and pain, activate blood circulation and remove blood stasis, or do some physical therapy, and the symptoms will slowly improve. 2, if the thoracic spine’s small joints are misaligned and compress the nerves in the back, the back pain can usually be relieved after the small joints are reset. The symptoms will be relieved soon after the small joints are reset. 3, if the degenerative changes of cervical spondylosis, such as small joint misalignment, osteophytes or herniated discs, compress the nerve roots on the left side and cause back pain on the left side, it is necessary to treat cervical spondylosis mainly, usually through cervical traction, physiotherapy, medication or The acupuncture and massage therapy of Chinese medicine can receive good results.