There are many reasons for the following dizziness in patients: 1. For example, if the patient has a transient dizziness in the process of getting up, it is mostly related to postural hypotension. Because the blood pressure is not adjusted in time when the position changes, a transient shortage of blood supply to the brain can occur. 2, if the patient is dizzy at once is in the process of head change, to consider that it is caused by otoliths. 3, if the patient usually has poor health, hypertensive disease, poor blood pressure control, can also cause the patient to appear episodes of dizziness, head swelling symptoms. 4, there is also the patient if there is If the patient has severe stenosis of the cerebral blood vessels, when the sweating is high under the condition of exertion, poor rest or low diet, it will easily lead to insufficient blood volume and episodes of dizziness, accompanied by nausea, vomiting, and even numbness of the limbs in severe cases.