Headache in summer may be caused by insomnia, heat stroke, migraine, high blood pressure and other factors. 1. Insomnia: In summer, poor quality of sleep at night may cause headache during the day, which may be accompanied by fatigue, decreased concentration and sleepiness. 2. Heatstroke: In summer, the weather is hot, such as long time heavy labor, sweating more, not timely replenishment of water, may cause heatstroke, headache, may also be accompanied by dizziness, sweating, thirst, limb weakness and other manifestations. 3. Migraine: the occurrence of this disease may be related to genetics, environmental factors, mental and psychological factors, such as migraine attacks in the summer, there will be head swelling and pain, in addition may also be accompanied by photophobia and phonophobia and other symptoms. 4. High blood pressure: the existence of high blood pressure disease, blood pressure control is not stable fluctuations, will cause headache, may also be accompanied by nausea, vomiting, chest tightness, tinnitus and other symptoms. Summer headache may be related to a variety of factors, such as severe or frequent symptoms, it is recommended to consult a doctor in a timely manner to clarify the cause of the standardized treatment.