When the shoulder joint is dislocated habitually, attention should be paid to it, and the symptom is mostly caused by shoulder capsule dysplasia, excessive exercise, muscle laxity, trauma and other factors. 1. Shoulder capsule dysplasia: congenital shoulder capsule dysplasia will lead to the instability of the structure around the shoulder joint, which will easily lead to the symptoms of shoulder dislocation during activities. 2. Strenuous exercise: prolonged excessive shoulder activities will lead to injury of soft tissues around the shoulder joint, which will lead to unstable function of the shoulder joint and easily lead to habitual dislocation of the shoulder joint. 3. Muscle laxity: when the muscles around the shoulder joint become lax, it will lead to the instability of the shoulder joint structure, which will easily lead to dislocation of the shoulder joint. 4. Trauma: If the shoulder falls or hits the ground accidentally, it will cause damage to the glenoid and capsule of the shoulder joint, which will lead to habitual dislocation of the shoulder joint. When habitual dislocation of the shoulder joint occurs, it is necessary to go to the hospital immediately to find out the cause of the disease and take active treatment.