There are several common reasons for shoulder high and shoulder low: first, it is common in work, study or life, too much weight on one shoulder, or to keep this crooked shoulder posture for a long time, resulting in muscle imbalance of the neck, shoulder and back muscles or functional shoulder high and low. In this case, we should pay attention to avoid long-term unilateral shoulder weight-bearing or long-term crooked shoulder posture. Secondly, painful strain, injury or inflammation of the muscles, ligaments and fascia of the back of the neck and shoulders can cause the body to develop a protective crooked shoulder posture. There is also the first common in adolescents, appearing to have high shoulders on one side and low on the other, and razorback when bending, which is a manifestation of scoliosis. Scoliosis requires a detailed specialist examination to measure the angle of scoliosis and the degree of progression to decide whether to treat it with observation, brace fixation, or elective surgery.