Brain tumors in children commonly include meningioma, glioma, nerve sheath tumor, medulloblastoma, etc. They are usually associated with genetic mutations caused by ionizing radiation, viral infection, drug abuse and inhalation of harmful gases. Generally speaking, brain tumors in children may show some symptoms of increased intracranial pressure due to tumor compression of adjacent tissues, blood vessels and nerves. However, due to the different locations and nature of brain tumors in children, the clinical manifestations are not exactly the same, but there are not as many as 10 precursors, which can be mainly summarized into the following aspects: 1. neurological symptoms: children may appear irritable, cry easily or have poor mental consciousness, headache, dizziness, drowsiness and other mental state manifestations, which may be caused by the growth of brain tumor, compression of adjacent nerves and meninges, or elevated intracranial pressure. 2. 2. Digestive symptoms: children may suffer from indigestion, nausea, vomiting and other digestive symptoms, which may be caused by brain tumor pressing on sympathetic and parasympathetic nerves and involving the digestive system. 3. In addition, during infancy and early childhood, there may be enlargement of the skull, mostly due to the separation of cranial sutures caused by the increase of intracranial pressure due to unclosed cranial sutures or incomplete closure of cranial sutures; 4.Visual symptoms: When brain tumor of children presses the optic nerve, symptoms such as decreased visual acuity, blurred vision, double vision, etc. may occur, and may be accompanied by optic papilloedema, etc.; 5.Neck symptoms: Symptoms such as stiff neck and restricted movement may occur. This is because when children suffer from brain tumor, the brain tumor compresses the nerves innervating the neck, which may cause muscle spasm in the neck; 6. Because the urination center is located in the cerebral cortex, if the tumor in the child’s brain compresses the urination center, it may lead to related symptoms. In addition, if children show abnormal growth level, such as too thin or slow growth rate, it is also important to consider the presence of brain tumor and other diseases. Because most of the common symptoms of brain tumors in children are not specific, they can be easily confused with other diseases when they appear. If a child shows the above symptoms, it is not necessarily a brain tumor, but he/she should go to the hospital actively for examination, and the doctor will judge and treat accordingly.