Shoulder soreness and swelling can usually be caused by shoulder muscle strain, shoulder trauma, aseptic inflammation, cervical spondylosis and other reasons. 1. Shoulder muscle strain: Long-term weight-bearing or activity of the shoulder can cause chronic strain of the shoulder muscles, resulting in symptoms such as shoulder soreness, pain, and even restricted movement. 2. Shoulder trauma: external impact and pulling may cause shoulder trauma, resulting in scapula fracture, dislocation of the shoulder joint and soft tissue injury around the shoulder, which may cause swelling of the shoulder, accompanied by pain and subcutaneous bruising. 3. Aseptic inflammation: trauma and chronic strain injury can cause frozen shoulder, osteoarthritis and other aseptic inflammatory reactions, which can cause soreness and pain in the shoulder, including the deltoid muscle, as well as impaired joint movement. 4. Cervical spondylosis: Cervical spondylosis, such as cervical disc herniation and cervical spondylolisthesis, can lead to compression of the spinal cord and nerve roots, resulting in pain in the soft tissues around the neck, and radiating pain and numbness in one side of the shoulder joint and the upper limb. Shoulder soreness and discomfort, it is recommended that the patient timely hospital consultation, to clarify the cause of the disease for standardized treatment.