The reason why the weather change headache, may be related to the cold stimulation, may also be due to migraine, high blood pressure and other reasons. 1. Cold stimulation: Due to the weather change, the temperature is lowered, if you don’t pay attention to keep your head and face warm when you go out, you will be stimulated by cold, which will cause cerebral vascular spasm and contraction, resulting in insufficient blood supply to the brain tissues, and then it may cause headache. 2. Migraine: If there is a history of migraine, due to weather changes, triggering a migraine attack, it will cause headaches, which may also be accompanied by dizziness, photophobia, phonophobia and other symptoms. 3. Hypertension: If there is a history of hypertension, cold stimulation can lead to peripheral vasospasm, which in turn causes an increase in peripheral vascular resistance, and may cause fluctuations in blood pressure to rise. Increased pressure inside the cerebrovascular system due to elevated blood pressure can cause headaches by constantly stimulating the dura mater. Weather changes headache, may also be caused by other reasons, if the headache symptoms continue to be unable to relieve, should be as early as possible to consult a doctor to diagnose the cause, to give targeted treatment.