The bumps around the neck tendons may be caused by the following reasons: First, there may be swollen lymph nodes in the neck, most commonly around the sternocleidomastoid muscle, which can be felt as hard swellings and are painful to press, with clear borders and high mobility. Second, it may also be caused by thyroid nodules, but thyroid nodules usually do not cause pain if there is no inflammation or cancer, so you can go to the ultrasound room of the hospital to do local ultrasound, which can basically identify and diagnose. Thirdly, if the bumps appear on top of the muscles on the back side of the neck, it may be an inflammatory mass caused by muscle strain or inflammation.