The back of the head of the human body presents a curved or round-like shape without a completely flat structure. The unevenness of the back of the head, but the patient does not experience any obvious dizziness, headache or head abnormality, will not cause any effect on the human body. It is possible that the individual has an abnormality of the skull during congenital development, or that the unevenness of the back of the head is caused by the extrusion of the skull due to improper sleeping posture during infancy and childhood. If the back of the head is obviously uneven, accompanied by obvious headache, dizziness and other related clinical symptoms, it is recommended that the patient go to the hospital as soon as possible, and can improve the head CT or magnetic resonance examination, to clarify whether it is accompanied by intracranial space-occupying lesions or cranial bone anomalies. For patients with intracranial space-occupying lesions, surgery should be performed as soon as possible to avoid serious complications.