There is no such thing as the simplest way to determine acromioclavicular impingement, and it usually requires a professional doctor to make a comprehensive analysis and judgment by combining clinical symptoms, auxiliary examination results, and so on. Acromioclavicular impingement refers to a series of clinical manifestations caused by the impingement between the subacromial structures of the shoulder and the rostral shoulder arch. The main clinical symptoms include shoulder swelling, which is caused by localized tissue bleeding and inflammation during acromioclavicular impingement, resulting in localized swelling. In addition, there will be pain in the shoulder, as well as limitation of shoulder joint movement due to pain, which is especially pronounced during shoulder abduction. There is a pain arc effect, and the pain is usually very pronounced between 60° and 120° of abduction. Ancillary examinations are performed by taking X-rays and MRI. Osteophytes at the acromion can usually be seen on X-ray, and damage to the shoulder joint and rotator cuff can be shown on MRI, which is when subacromial impingement can be diagnosed. If you have the above symptoms or suspect that you are suffering from subacromial impingement, you should go to the hospital in time, complete the relevant examinations, follow the doctor’s instructions for standardized treatment after a clear diagnosis, and do not blindly take care of your own treatment, so as to avoid delaying your condition.