Possible causes of back muscle pain include myofasciitis, ankylosing spondylitis and cervical spondylosis. 1. Myofasciitis of the back: It may be caused by excessive fatigue, tension, or fatigue of the back muscles, which leads to the symptoms of muscle pain in the back. 2. Ankylosing spondylitis: Ankylosing spondylitis may be caused by heredity, infection, environment, immunity, etc. Its typical symptom is dull pain in lumbosacral region or back, accompanied by morning stiffness, fatigue and weakness, etc. Therefore, muscle pain in the back may be caused by ankylosing spondylitis. 3. Cervical spondylosis: cervical spondylosis is a disease based on degenerative disc disease, mainly due to the degenerative hyperplasia of the cervical spine compresses the nerve roots innervating the back muscles, thus leading to back muscle pain and other symptoms. Back muscle pain may also have other causes, it is recommended to go to the regular hospital in time to improve the relevant examination, clear the cause of the disease, under the guidance of the doctor for targeted treatment or treatment.