The intake of large amounts of water (5000-6000ml) in a short period of time will lead to a decrease in the osmotic pressure of the body’s blood, an increase in the amount of circulating blood, and a series of water intoxication manifestations. Water intoxication is often characterized by prominent psychoneurological manifestations, such as psychosis, headache, ataxia, disorientation, epileptic seizures, alternating drowsiness and agitation. There can also be intracranial hypertension manifestations, such as headache, vomiting, elevated blood pressure, respiratory depression, slow heart rate, etc., which can lead to death in severe cases. A large amount of water leads to a decrease in plasma osmolality, which can be manifested by fatigue, apathy, nausea, loss of appetite and swelling of subcutaneous tissues, and in severe cases delirium, convulsions or coma, and in severe cases permanent neurological damage or death. Although the incidence of water intoxication is very low, but in order to be safe, it is recommended to drink water should pay attention to a small amount of multiple times, the emergence of maladaptation actively seek medical treatment, active treatment, do not delay, so as not to cause adverse consequences.