Diagonal muscle palpation is a method for doctors to make judgment through the feeling when the hand touches the area, which can clearly check the signs that cannot be checked by visual examination, such as temperature, humidity, pressure pain, etc. It can also feel the position, size, surface nature, and hardness of the trapezius muscle. The trapezius muscle is the superficial muscle above or in the middle of the back, and has the function of suspending the shoulder girdle bone. Normally, incorrect sitting posture, such as long-term stooped sitting and habitual hunching, etc., is prone to neck stiffness and burning pain, and can also cause shoulder pain, pain when the head is turned, and headache. The use of palpation can effectively feel whether the trapezius muscle is swollen as well as lumps, etc. It is recommended that the usual strength is not too large, relax the muscles to avoid muscle tension, etc.