Common signs of overhydration, also known as water intoxication, include symptoms such as nausea, headache, and confusion. In more severe cases, individuals may experience seizures or altered mental states due to an electrolyte imbalance. The body can be overwhelmed by excessive water intake, diluting essential sodium levels and resulting in hyponatremia. Monitoring hydration, particularly during intense activities or in hot weather, is crucial to avoid these adverse effects. Individuals should ensure they balance water intake with their activity level and not excessively exceed hydration needs.