Anterior displacement of the humerus may be caused by trauma, ligamentous laxity, improper posture, and so on. 1. Trauma: If the humerus area is impacted by external force, resulting in localized injury, there may be changes in the bone structure, resulting in anterior displacement of the humerus. 2. Ligament laxity: Ligament laxity may be caused by chronic or acute inflammatory stimulation, ligament tear and other sources. When localized ligament laxity occurs in the shoulder joint, it may affect the stability of the shoulder joint and produce anterior displacement of the humerus. 3. Improper posture: taking wrong posture for a long time, such as wrong posture in fitness. This may cause the local structure of the joint to be abnormal, thus causing anterior displacement of the humerus. Humerus anterior displacement can also be seen in other reasons, it is recommended to go to the hospital in a timely manner, do the relevant examination to clarify the cause of the disease, and then follow the doctor’s instructions for treatment, to avoid delaying the condition.