Cerebral thrombosis rarely starts with headache, and headache does not appear as a common symptom of classical cerebral thrombosis, but some patients often have headache after thrombosis for several reasons: i. Before thrombosis, these patients often have combined neuropathic headache, and this headache is only due to the mechanism of thrombosis aggravating the original pain and allowing the original symptoms to amplify. Second, look at the key site of the cerebral infarction, if the infarction is particularly close to the cortex and close to the meninges, this can trigger a headache at this time. Third, depending on the state of blood vessels, if a patient with atherosclerosis or long-term hypertension, accompanied by vascular diseases, such as small hemangioma, unstable blood pressure and decreased vascular elasticity, headache can occur at the stage of reinfarction. Fourth, it is common to have complications after cerebral infarction, such as inflammation after cerebral infarction, and these inflammatory substances can also stimulate the nociceptive structures of the cranium and produce headache.