@Steve Hi Steve: Many research sites discuss that the straightening of the cervical spine is one cause of somatic T. When this happens, it appears pressure is placed on the stem cell, muscles and nerves in the neck and around the dorsal network.
Other researchers place more focus on the muscles themselves.
Many articles state that a chiropractor doctor using neck manipulation treatment such as the Atlas method helps somatic T. One article said 30% get 90% relief, 40% get 50% to 70% relief and 20% no relief.
I think that knowing more about neck manipulation statistics would be helpful.
Of all the other treatments that I have tried, only using a folded towel pressing on the back of my neck has helped and then to use trigger point therapy on muscles.