The following are common causes of shoulder soreness and swelling: First, shoulder muscle strain. Prolonged use of the shoulder joint for lifting and elevating movements can lead to significant strain on the shoulder muscles, especially the deltoid muscle. Patients may suffer from shoulder pain and swelling, and may experience weakness in shoulder abduction and supination. Secondly, cold in the shoulder joint may also cause neuroedema and clinical manifestations of shoulder swelling. Third, fractures and dislocations of the shoulder joint, especially during the recovery period, require braking, which will cause the shoulder to gradually develop postural fixation, soreness and pain. After active rehabilitation, the symptoms of shoulder soreness and swelling will gradually recover. Therefore, if the shoulder becomes sore and swollen, the cause should be clarified and the corresponding treatment should be used to solve the problem according to the cause.