This symptom means that the shoulders on both sides move forward toward the middle.

Inward buckling of the shoulders means that the inner edge of the bilateral shoulder blades is too close to the center of the spine. It is caused by poor acquired sitting posture, or it may also be caused by bad daily habits, such as using the computer for a long time, looking down at the mobile phone, etc. The development of shoulder muscles is unbalanced, causing both shoulders to move closer to the middle. If the buckle is not serious, it can be corrected by correcting your sitting posture and doing some corrective actions.