Since this is a common symptom, I feel it is necessary to explain it to you. With the development of the times, people rely more and more on computers, especially teachers, employees and other professions, and spend more and more time with their heads down. Of course, if you like to play mahjong or poker, you also need to lower your head. The neck is a bridge between the head and the body, it needs a certain amount of power to support the source of this power provided by the muscles of the neck, think about it, if the muscles are in a state of power for a long time, that is, the state of tension, it can eat it? With the passage of time, it is bound to produce damage, which we call strain injury in orthopedics. When this strain reaches a certain level, the static structure around the cervical spine: ligaments also begin to damage, and even contracture, then you will begin to feel uncomfortable neck, at first pain (caused by injury), followed by tightness (caused by contracture), you will begin to shake the neck, only then you will feel a little comfortable. At this time you go to the hospital to check, take x-rays will not have abnormal changes, but you should beware, although your bones do not change for the time being, but the real cervical spondylosis is not far away. If you have to work in front of the computer, it is recommended to get up every hour and go flying a kite during the break, because the head tilting action is good for the relaxation of the neck muscles. Don’t take my words as a whisper, if not, you are not too far from the hospital.