Headache when the weather is hot: 1. Consider that the heat causes the blood vessels to dilate, especially the peripheral blood vessels to dilate, resulting in insufficient blood supply to the brain, causing spasm of the cerebral blood vessels, which results in headache. The patient can be advised to take oral medication to relieve vasospasm, commonly used are flunarizine hydrochloride, etc. 2, see the patient has a history of migraine, due to the hot weather causes the patient to rest poorly, triggering migraine attacks, when necessary, you can take oral headache relief drugs, commonly used are ibuprofen, acetaminophen or with acupuncture to improve the headache attack. 3, see the obese patients, especially the usual diet The headache is caused by lack of oxygen to the brain cells due to more sweating in hot weather and reduced effective blood volume of blood circulation.