Swelling at the junction of the neck and shoulder can be caused by the following reasons. First, is the place of muscle strain caused by aseptic inflammation, common in the long-term low head work, life of the crowd is more common, usually shoulder or neck muscle strain, over time, can cause local aseptic inflammation, inflammation will lead to the place of some swelling, pressure and pain, if serious, there will also be red skin flushing, such as redness, swelling, heat, pain symptoms. Second, there may be cervical spondylosis caused by some degenerative changes in the cervical spine, such as herniated discs, small joint dislocation or osteophytes, compression of the dural sac or nerve root caused by some of the nerves around the neck or shoulder pulling pain, then the pain stimulation of the local muscle spasm will occur, and localized swelling, touching the local muscles will also appear muscle tension, pressure and pain and other sensations.