Headaches are a common symptom in life. Some headache patients are able to fly, but patients with serious illnesses that cause headaches are not able to fly. Patients with acute cerebral hemorrhage or subarachnoid hemorrhage, which are serious diseases, should not fly and should be treated immediately and remain lying down to prevent life-threatening bleeding. If the headache is functional, such as migraine, tension headache or neurological weakness, it does not affect the patient’s ability to fly, but the strain of travel may aggravate the headache. The headache caused by fever can also fly, and there is no significant effect on the change of the condition, so it should be clinically determined whether the patient can fly according to the cause of the disease.