Among some patients with headache, headache symptoms are relieved if vomiting follows the headache, indicating that it is due to increased intracranial pressure. After a headache, the transmitters in the brain change and the blood vessels may spasm or dilate, causing changes in intracranial pressure, especially an increase in pressure. After the increase of intracranial pressure, the gastrointestinal tract will be irritated and affected, and the feeling of vomiting will occur, but after vomiting, the intracranial pressure will be reduced and the pain sensation will be reduced or disappeared. However, if headache occurs repeatedly, intracranial Doppler or head MRI should be checked promptly to exclude intracranial occupying lesions or intracranial organic lesions, such as encephalitis, meningitis, brain tumor or intracranial tumor; non-specific symptoms, such as simple neuropathic pain, vomiting caused by non-specific headache due to plant nerve dysfunction or poor sleep.