Parents of children with brain tumors are usually unable to accurately determine whether the child has a brain tumor. Further medical examination is required to determine whether it is a brain tumor through medical history, symptoms, and imaging tests. 1. Medical history: If the patient presents with typical headache, epilepsy, non-specific cognitive or personality changes, or typical increased intracranial pressure, intracranial tumor may be suspected. Further relevant investigations are needed to exclude otitis media, head trauma, etc. as a result. 2. Symptoms: Headache is mostly episodic, progressive headache, which is more severe in the early morning or during sleep. It is often accompanied by vomiting, vision loss, dizziness, seizures, diplopia and so on when severe headache occurs. In addition, mental and consciousness disorders are characterized by apathy, slow reaction and slow thinking. 3. Imaging examination: CT and magnetic resonance, most of intracranial tumors can be diagnosed qualitatively by CT and magnetic resonance. Magnetic resonance enhancement scan is the first choice for diagnosing cranial brain tumor. Positron emission tomography (PET) is used to detect tumors and determine the degree of malignancy, determine primary, metastatic or recurrent tumors, and also determine brain function. When the above symptoms occur, it is recommended to consult a doctor in time, follow the doctor’s instructions for further examination, clarify the cause with the doctor’s help, and carry out targeted treatment or therapy.