The tight, heavy feeling in the back may be caused by the following reasons: First, it is possible that when sleeping, the mattress is too soft, or the bed board is too hard, resulting in the muscles of the back have to exert themselves for a long time to maintain the correct body position, resulting in fatigue damage to the back, and a heavy, tight feeling. Usually more activities, relax the muscles or change the mattress, the symptoms will naturally disappear. Second, it may be caused by strain on the muscles of the back, commonly seen in people who often do back muscle exercise, or people who often use their shoulders and back to carry things, lift things. Third, it may be a neurological sensory abnormality, stimulating the local muscles to appear local muscle spasm, appearing heavy feeling. For example, cervical spondylosis or misalignment of the small joints of the thoracic spine may compress the nerve roots in the back of the shoulder and cause this sensation.