It hurts when opening the back, mainly due to the following reasons: 1. When it is massaged, it may touch the spastic muscle strips, at which point it will induce significant pain. Some patients due to long-term poor posture or back cold, resulting in a group of muscles in the back for a long time to produce spasm. 2, may touch the tension of the fascia, some patients due to back cold led to aseptic inflammation of the deep fascia parts, then the deep fascia parts will have obvious tension, restricted movement and obvious pain when pressed. 3, there may be small back spine Misalignment of the joints. This situation is often seen in patients sitting or standing with a hunched back or prolonged sitting and standing with the head down, which causes disruption of the relative relationship of the small joints of the spine. When the back is massaged and the lesion is touched or reset, there will be significant pain.