Too much of everything is poisonous and that applies to water. It has been hammered into our heads that we need to drink at least 8 glasses of water a day to stay hydrated. However, drinking too much water can be dangerous. You need to factor in your body size, activity level and types of food you consume before you go downing gallons of water in the name of staying healthy. Too much water intake can upset your body’s sodium balance resulting in water intoxication also known as hypernatremia. This causes the cells to swell after too much water from the bloodstream flows into the cells. In extreme cases, it causes death, especially in athletes. If you suspect you may be drinking too much water here are signs you should pay close attention to and take necessary action: