Overhydration during intense exercise can lead to a condition known as hyponatremia, which occurs when sodium levels in the blood drop to dangerously low levels. This imbalance can cause cells to swell, resulting in symptoms ranging from mild headaches and nausea to severe complications like seizures or coma. While hydration is crucial for maintaining performance, consuming excessive amounts of water without adequate electrolyte replacement can be detrimental. Athletes must find a balance in their hydration strategies, ensuring they replenish lost fluids without overwhelming their body’s capacity to regulate sodium levels.