The causes of headaches in children include lack of sleep, respiratory infections, intracranial infections, intracranial tumors, and cerebrovascular malformations. 1. Lack of sleep. Small children can have headache symptoms due to lack of sleep and poor sleep quality caused by staying up late and other reasons. 2. Respiratory infections. Including the common cold, sinusitis and so on. At the time of the onset of the disease, due to the invasion of the body by the heat-causing source, the production of inflammatory mediators, the patient will have a headache, fever and other symptoms. 3. Intracranial infections. Including viral meningitis, bacterial meningitis, tuberculous meningitis and so on. At the onset of intracranial pressure increase, then in addition to headache symptoms, there will be poor mental health, nausea, vomiting and so on. Combine with MRI and cerebrospinal fluid examination to confirm the diagnosis. 4. Intracranial tumor. Including intracranial glioma, etc., when the attack is due to intracranial occupation effect, the intracranial pressure increases, manifested by headache and other symptoms, combined with the cranial MRI and other tests to confirm the diagnosis. 5. Cerebrovascular malformation. This disease is related to congenital factors, the onset of headache, nausea and other symptoms, diagnosed by cerebral angiography. There may be other causes of headache, parents should take their children to the doctor in time to clarify the cause as soon as possible.