There are several common causes of subacromial pain. The first and most common is fasciitis, where the fascia is traumatized or chronically stretched, which causes chronic aseptic inflammation, leading to subacromial pain. Secondly, infection of the surrounding tissues, skin infection, subcutaneous infection or infection of the surrounding organs can cause subacromial pain. The third is that tumors of the surrounding tissues, soft tissue tumors, or bone tissue tumors can compress this area and cause pain in this area.”