Dizziness after drinking too much water may be a symptom of water intoxication. Water intoxication is a series of symptoms that occur when water intake exceeds collective water discharge, resulting in water retention in the body and an increase in circulating blood volume, and the production of water intoxication is related to the speed of drinking water and the ability of the kidneys to metabolize it. The kidneys produce about 1L of urine per hour, and if a large amount of water is drunk at once, the metabolic capacity of the kidneys will be insufficient to produce water intoxication. 24 hours of water intake exceeding 4 liters will produce the risk of water intoxication. Symptoms of water intoxication include dizziness, headache, nausea, vomiting, blurred vision, fatigue, drowsiness, and in severe cases, coma brain herniation, pulmonary edema, and respiratory distress. Clinical treatment for mild cases is based on diuresis, mainly applying diuretics such as furosemide. The treatment of acute cases is aimed at protecting cardiac and cerebral functions, dehydration and correction of hypotonicity, and drinking moderate amounts of water in life, not a large amount of water at once in a short period of time.