Whether to do CT or MRI for headache is mainly to consider the cause of headache, as follows: 1. Do CT: If the headache is considered to be caused by cerebral hemorrhage, it is relatively more sensitive and faster to do CT; 2. MRI: If the headache is considered to be caused by other reasons, such as headache caused by cerebral infarction or intracranial infection, it is recommended to do MRI, which is relatively clearer, and head CT may not be able to The head CT may not be able to determine it. It is recommended to go to the hospital and the doctor will determine whether to do CT or MRI according to the specific situation, symptoms, and signs, which will be more helpful to the condition.