The back of the head there is a raised hard bag and bone may be occipital bone, is a normal physiological phenomenon, there may be osteophytes, osteoma and other pathological factors. 1. Occipital bone: normal people’s back of the head has a bony bulge, called occipital roughness, itself is outwardly protruding, individual bulge will be larger, is a normal physiological phenomenon, do not need special treatment. 2. Osteomalacia: Osteomalacia of the cervical vertebrae will also appear in the back of the head to be more prominent bony mass, belonging to the degenerative lesions of the cervical vertebrae. 3. Osteoma: such as chondroma of the skull, can also appear in the back of the head bony lumps, usually caused by congenital factors, external collision and external stimulation and other factors, belongs to benign tumors. The back of the head has a raised hard bag may still be caused by other reasons, it is recommended that the patient timely hospital consultation, identify the cause of the disease, give standardized treatment.