Purely from the anatomical structure of the trapezius muscle, which starts at the spinous process of most of the thoracic vertebrae and ends obliquely above near the shoulder joint, for this part of the muscle strain, strain, any external injury can cause pain, more common is the shoulder in a fixed position for a long time, the whole trapezius muscle is in a strain, strain, such as working in front of the computer or driving, itself has the habit of fitness, upper limb For example, if you work in front of a computer or drive a car, if you have the habit of working out, if you do a lot of strength, if you carry heavy things, if you do physical work, or even if you play badminton, if you have more range of motion in the shoulder joint, it can cause pain in this area. However, this type of pain can be gradually reduced by resting more and using hot compresses, massage, physical therapy and topical pain relief creams. If there is no particular improvement, you should go to the orthopedic department of the hospital to determine whether there are other types of lesions.