Yes, it is possible to drink too much water, a condition known as water intoxication, water poisoning, or overhydration. Drinking excessive amounts of water can overwhelm the kidneys' ability to remove water, leading to a dilution of electrolytes in the blood, especially sodium. This results in a condition called hyponatremia where sodium levels fall below normal, causing water to move into cells and make them swell. When brain cells swell, it can increase pressure inside the skull, which is dangerous and potentially life- threatening. Symptoms of drinking too much water can start with mild effects like headache, nausea, vomiting, fatigue, and muscle cramping. More severe symptoms include confusion, drowsiness, double vision, seizures, brain damage, coma, and in extreme cases, death. This condition is rare but can happen, especially during intense physical activities like endurance sports or in cases of mental health disorders. The kidneys can filter about 0.8 to 1.0 liters of water per hour, so drinking beyond this rate can put one at risk of water intoxication. In summary, while hydration is essential, it's important to drink water according to thirst and not excessively fast to avoid serious health risks.