Patients back a point of pain, the reasons are as follows: a. supraspinous ligamentitis: this is the most common cause, supraspinous ligament is in the middle of the spine, often due to frequent bending labor or lifting heavy objects, which will cause high load on the supraspinous ligament, gradually will appear supraspinous ligamentitis, so the main manifestation of pain in the center of the back. Second, local compression: for example, women wearing back buckle chest belt, chest belt and supraspinous ligament friction, will cause friction point of supraspinous ligamentitis, so it will be manifested as a single point of pain in the central back. Frozen shoulder: The pain of frozen shoulder can sometimes involve the shoulder nail area, which is manifested as a small range of regional pain or a single point of pain.