Headaches in hot weather may be caused by the dilation of blood vessels in the skull. When the weather is hot, it is easy to cause vasodilatation throughout the body, and when intracranial vasodilatation occurs, patients can have headaches, and in severe cases, nausea and vomiting can occur. Headache is a symptom that can be caused by a variety of diseases, including primary headache and secondary headache.1. Primary headache is commonly associated with migraine, tension headache and cluster headache, and the patient is mainly treated with symptomatic pain relief, commonly used drugs include ibuprofen, indomethacin and naproxen.2. Neurovascular headache can also be treated with zolmitriptan and sumatriptan. 3. Secondary headache generally has a clear etiology and is mainly treated by giving etiological treatment along with symptomatic analgesic treatment. Common causes include cranial tumors, cranial trauma, and central nervous system infections, mainly encephalitis and meningitis.4. It may also be caused by cerebrovascular diseases, mainly cerebral hemorrhage and subarachnoid hemorrhage. Headache may also occur if the patient is suffering from a large cerebral infarction.