Patients feel suddenly dizzy for the following reasons to consider: 1, consider that it is caused by postural hypotension, many people will have this experience, when the patient in the process of squatting suddenly stand up will have a transient dizzy episodes, because the blood pressure is not adjusted in time to cause the patient’s brain transient insufficient blood supply caused by the blood pressure, can be clear by measuring the patient’s blood pressure in the lying and standing position. 2, patients feel suddenly dizzy also have The sudden dizziness may be caused by transient cerebral ischemic attacks, such as cerebral arteriosclerosis and cerebrovascular stenosis, and certain triggers may cause the patient’s cerebral blood supply deficiency to worsen, and the patient may feel sudden dizziness. The dizziness may also be accompanied by the performance of blackness in front of the eyes.