Drinking too much water may cause water poisoning, which is called "hyponatremia" in medicine. Simply put, drinking a lot of water in a short period of time leads to the imbalance of electrolytes in the body.

Symptoms include headache and edema, and in severe cases, they need to be sent to the hospital for emergency treatment.

However, the conditions of water poisoning are very bad. As long as you don't drink water in a hurry, your body will excrete excess water.