What causes hyperhydration?

Hyperhydration, or overhydration, occurs when the body takes in more water than it can excrete, leading to an imbalance in electrolytes, particularly sodium. This can result from excessive fluid intake, certain medical conditions like kidney disease, or prolonged endurance activities without proper electrolyte replacement. Symptoms may include swelling, headache, nausea, and in severe cases, can lead to water intoxication or hyponatremia. It's important to maintain a balance between fluid intake and output to prevent hyperhydration.