Children often say headache, common causes include: sinusitis, intracranial lesions, functional factors and so on. 1. Sinusitis: it can be accompanied by headache, nasal congestion, pus, olfactory impairment, visual impairment and other symptoms. 2. Intracranial lesions: intracranial tumors, intracranial infections, etc. can cause headaches, accompanied by fever, projectile vomiting, drowsiness, and neurological abnormalities. 3. Functional factors: often caused by lack of sleep, mental stress, fatigue, etc., there may be no organic lesions, through sufficient sleep time, appropriate release of pressure can be relieved. Children often say headache, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.