Numbness above the middle of the spine of the back may be related to physiological factors such as the hardness of the bed board and the pressure on the back, or it may be related to cervical spondylosis, ankylosing spondylitis, thoracic spondylosis and other diseases. 1. Physiological factors: because of the hardness of the bed board during the night sleep, the back soft tissue pressure and other factors, may appear back numbness, change posture to reduce local pressure can be relieved. 2. Cervical spondylosis: cervical disc herniation can compress the spinal cord and nerve roots and cause numbness and pain in the back of the neck, shoulders and back, as well as pain and numbness in the upper limbs unilaterally or bilaterally. 3.. Ankylosing spondylitis: a chronic inflammatory disease, belonging to the rheumatic immune disease, can violate the thoracic vertebrae to oppress the nerves innervating the thoracic back, and numbness and pain and other symptoms will also occur. 4. Thoracic spine lesions: such as thoracic spine tuberculosis, thoracic spine tumors and other diseases may also compress the nerves innervating the back, and symptoms such as numbness and pain may occur. If there are symptoms of numbness above the middle part of the backbone, it is recommended that the patient go to the hospital and receive regular treatment to clarify the cause of the disease.