Headache after sweating may be caused by vasoconstriction or lower intracerebral pressure after sweating, or cold. 1. After sweating due to a large amount of sweat is discharged from the body, subcutaneous blood vessels are in a state of expansion, so that the temperature of the skin surface is reduced, which can cause vasoconstriction, vasospasm headache. 2. As a large amount of sweat is discharged, it can lead to a reduction in blood flow in the body, resulting in a decrease in blood perfusion pressure in the brain, so that the intracerebral pressure is lowered and headaches occur. 3. Cold and flu: If you are exposed to wind or cold after sweating, it may cause cold and flu, leading to headache and other symptoms. After sweating headache persists unrelieved can go to the regular hospital in a timely manner, to clarify the cause, such as the need for treatment, should be standardized under the guidance of the doctor, so as to avoid delays in the condition of the body to bring about adverse effects.