The causes of transient blackout are as follows: 1, insufficient cerebral blood supply: transient insufficient cerebral blood supply will lead to transient blackout, but after a while can quickly return to normal, for this situation, if necessary, you can improve the cranium and cervical blood supply test, improve the cranial magnetic resonance detection. 2, cardiovascular disease: cardiovascular arrhythmia, can lead to patients with blood flow supply disorders, resulting in transient blackout, you can improve the 24-hour dynamic electrocardiogram to understand the relevant indicators. Cardiovascular disease: cardiovascular arrhythmia can lead to the patient to appear blood flow supply obstacles, leading to the patient to appear transient blackout, you can improve the 24-hour dynamic electrocardiogram to understand the relevant indicators. 3, other diseases: diabetic patients in the use of hypoglycemic drugs, if the occurrence of hypoglycemia, will also lead to the patient to appear transient blackout, so if the patient is diabetic, it is recommended to test the blood glucose.