Overhydration can have serious implications for health, potentially leading to a condition known as water intoxication or hyponatremia, where sodium levels in the body become dangerously low. Symptoms might include headaches, nausea, and in severe cases, seizures or coma. It can disrupt the balance of electrolytes, adversely affecting muscle and nerve function. While staying hydrated is essential, maintaining a balance is crucial, especially during exercise or hot weather conditions to avoid both dehydration and overhydration.