Headache when it is hot may be caused by intracranial vasodilatation and intracranial diseases, which can be handled according to the cause, such as cold compresses, head massages, adequate sleep, medication, and so on. Heat can easily cause vasodilatation of blood vessels throughout the body, and intracranial vasodilatation can manifest as headaches, and in severe cases, nausea and vomiting. If the temperature of the external environment is high, you can put a cold compress on the head, massage to relieve the pain symptoms, usually need to drink more water, keep enough sleep and light diet, avoid staying up all night and excessive fatigue. If the intracranial diseases such as migraine, infectious meningitis need to be treated, migraine can be relieved by aspirin, sumatriptan, etc.; infectious meningitis common pathogens include bacteria, viruses and fungi, can use ceftazidime, vancomycin, ribavirin, fluconazole and other drugs. The above drugs need to be taken under the guidance of a doctor to avoid serious adverse reactions.