I have had this pain for several years, but much more severe in last few months. Im not sure where the pain comes from but the trigger points feel the same. if I press my upper arm muscles, thumbs muscles and shoulder muscles the pain is the same! My neck and shoulder pain varies in intensity, but the thumb muscle pain is constant and severe, it also has a burning sensation, in the large thumb muscle, it is not in the thumb joints more towards the wrists. Both hands are affected, both sides of neck and shoulders are affected and pain will radiate to base of skull. I am a pianist and the thumb pain restricts my playing. I don't have redness or swelling. I don't spend hours on a computer, but when I do I have notices an increase in pain.