The common causes of supraspinatus pain include acromion fracture, subacromial impingement syndrome, rotator cuff injury and so on. 1. Acromioclavicular fracture: when the shoulder joint suffers from localized direct impact, resulting in acromioclavicular fracture, pain in the upper part of the acromion occurs. 2. Subacromial impingement syndrome: Due to the formation of bone spurs and calcification, the space for the rotator cuff muscles to move becomes narrow, resulting in wear and tear of the rotator cuff muscles, causing pain in the upper part of the acromion. 3. Rotator cuff injury: when the rotator cuff structure is damaged due to trauma or chronic inflammation, the tendon will undergo edema and inflammatory changes, or even rupture, thus causing supraspinatus pain. There may be other causes of supraspinatus pain, so it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and carry out standardized treatment under the guidance of the doctor.