A woman’s left back pain may be caused by incorrect posture, neck sprain, lumbar muscle strain, and collateral dorsal fasciitis. 1. Incorrect posture: If the patient sits, lies down and exercises in an incorrect posture, it will lead to the pulling of the back muscles and other tissues, and for a long time it will lead to pain in the left back. 2 lumbar muscle strain: left back pain can also be caused by lumbar muscle strain pain phenomenon, usually with cold or external pulling and so on have a certain relationship, resulting in patients with stiffness, discomfort, pain and other symptoms. 3. Cervical dorsal myofasciitis: the patient’s left back pain is considered to be caused by cervical dorsal myofasciitis, mainly due to the patient to maintain the same posture for a long period of time, resulting in damage to muscle fibers, so that the back, shoulders, neck, waist and other parts of the phenomenon of pain. There are many causes of this symptom, it is recommended that patients go to the hospital in time, under the diagnosis of the doctor, according to the patient’s condition, targeted treatment.