Drinking water a day to be more than 5 liters of water before the possibility of water poisoning, but under normal circumstances the body can urinate and sweat excess water out of the body, it is difficult to drink too much water to cause water poisoning. Generally, the standard amount of water for a normal person to drink is the 24-hour urine volume plus the amount of unobtrusive evaporation of about 500 ml, and the amount lost increases. For example, if the urine volume is 1.5-2 liters, you need to replenish 2-2.5 liters of fluid volume, including the water consumed. Water intoxication is when the total amount of water ingested by the body greatly exceeds the amount of water excreted, so that water is retained in the body, causing a decrease in plasma osmolarity and an increase in circulating blood volume. Causes of water intoxication include excessive secretion of antidiuretic hormone, which can be seen in cases of fear, blood loss, acute infection, and hypothyroidism; at the same time, renal dysfunction, such as in the oliguric and anuric phases of acute renal failure, and excessive intake of water, can easily lead to water intoxication; in addition, increased water intake, excessive water intake by the body, such as primary polyhydramnios in chronic psychiatric patients, or excessive amounts of infusions, and other conditions may also lead to excessive water intake of water poisoning phenomenon. In short, patients with water intoxication should immediately stop water intake once diagnosed and actively treat the primary disease.