A groove in the back of the head is not always a pathological problem, and it must be seen whether there are clinical symptoms. Some people often work with their heads down, work at the desk, sometimes both sides of the erector spinae muscle is relatively more developed, it will show a groove in the back of the head. Certain people who are obese and have more fat may also show a depression, creating the illusion of a groove. However, if it is accompanied by other changes in the condition, such as headaches and neck pain, be careful whether it is an abnormal manifestation brought about by cervical spondylosis or abnormal changes in the cervical vertebrae, or even occipital foramen magnum deformity. Therefore, if the patient has the above manifestations, he should go to the hospital in time for head CT examination and cervical plain film examination to observe whether there is any abnormal change in the bone quality, which can lead to a more accurate answer.