A bone protruding from the back of the head refers to a bony structure protruding from the back of the occipital region. In most cases, it is an occipital ramus, but if it is growing, it may also be an occipital osteoma. 1. Occipital ramus: A bone protruding from the back of the head, many of which are normal physiologic structures, is the occipital ramus. The occipital tuberosity is the attachment point of occipital muscle and capitellar tendon membrane, so it will be protruding, which is also necessary for physiological structure. 2. Occipital osteoma: if the patient has a protruding bony structure in the back of the occipital region, which is constantly increasing in size and even accompanied by pain, then we should be alert to the fact that it may be occipital osteoma, and we can do a cranial CT examination to help make a clear diagnosis. A bone protruding from the back of the head needs to be observed dynamically, and if there is any change, neurosurgery should be consulted as soon as possible.