If a patient experiences dizziness and headache in the afternoon, it is likely that he or she is experiencing high blood pressure in the afternoon. Generally speaking, the second period when patients have high blood pressure is from 2:00 pm to 6:00 pm, and it is likely that this time is due to the presence of high blood pressure, so that the patient has dizziness and headache. It is recommended that patients with symptoms of head discomfort should have their blood pressure measured first in order to rule out the existence of blood pressure abnormalities. If no abnormalities are found after examination, patients can combine head CT and transcranial Doppler examination. Other patients may have similar discomfort due to insufficient blood supply to the cerebral arteries or their own cerebral infarction.