A headache in summer may be a manifestation of heatstroke, or it may be caused by insufficient cerebral blood supply, migraine and other reasons. 1. Heatstroke: prolonged exposure to high temperature environment, causing an increase in the body’s core body temperature, resulting in central nervous system and cardiovascular dysfunction, generally manifested as headache, dizziness, accompanied by flushing, profuse sweating and other symptoms, and in severe cases, can be coma, convulsions. 2. Insufficient cerebral blood supply: summer temperature is high, skin peripheral blood vessels and pores are easy to expand, resulting in an increase in blood flow to the surface of the body, sweating too much. A large amount of water loss in the body, the body’s blood volume decreases, leading to a decrease in blood supply to the brain, headache symptoms. 3. Migraine: high temperature in summer, coupled with strong sunlight stimulation, leading to accelerated blood circulation, vasoconstriction function of the brain changes, easy to trigger migraine. Clinical manifestations in addition to severe headache, can be combined with nausea, vomiting and other symptoms. In summer, the temperature is high and sweating is easy, so it is necessary to replenish water and electrolytes in time. If you have a headache, it is recommended to go to the hospital for consultation, to clarify the cause of the disease and standardize the treatment under the guidance of the doctor.