When the patient has a headache lying down but not sitting, this indicates that the patient has a headache with high cranial pressure. When the patient is lying down, the amount of blood in the brain will increase, and this will result in high cranial pressure. When the patient has a headache and is in a sitting position, the position of the head is in a high position, and the perfusion of blood flow in the brain is reduced at this time, and it will not show the symptoms of headache, indicating that the patient’s headache with the change of position is The headache is caused by an increase in intracranial pressure. The main diseases that cause increased intracranial pressure are intracranial occupying lesions, venous sinus thrombosis or venous sinus stenosis, some patients may be caused by acute hypertension, and patients should also consider whether there is hydrocephalus, which leads to increased intracranial pressure.