When urination occurs after drinking alcohol, syncope refers to urinary syncope, which is caused by insufficient blood supply to the cerebral blood vessels. After drinking alcohol, the systemic vasodilatation may reduce the blood supply to the brain, and after urination, the abdominal pressure drops, which stimulates the vagus nerve and leads to excitation, causing a reflexive lowering of blood pressure and a decrease in the heart’s ejection volume. The blood supply to the cerebral blood vessels appears to be insufficient, leading to the brain cells in a state of hypoxia, and the phenomenon of fainting occurs. It is recommended that alcohol consumption should not be excessive, if there is a case of urinary syncope after drinking, you need to consult a doctor in time to avoid cerebrovascular accidents, under the guidance of the doctor to take intervention to reduce the damage to brain tissue.