Pain in the back of the head in children is not necessarily caused by a brain tumor, as there are many causes of pain in the back of the head in children. Firstly, it is caused by brain tumors, which can cause pain in the back of the head, and the pain tends to worsen progressively, which can be diagnosed by MRI of the child’s head. Secondly, it is caused by children suffering from influenza. Influenza can also cause pain in the back of the head, which is accompanied by high fever and weakness, and can be diagnosed with oseltamivir granules. In addition, the symptoms are caused by pterygoid sinusitis, which also causes pain in the back of the head, and the head tends to be less refreshing.