The symptoms of overhydration can include nausea, headache, confusion, and swelling, particularly in the extremities. This condition occurs when the body's electrolyte balance is disrupted due to excessive water intake, diluting sodium levels in the bloodstream. Severe cases of overhydration can lead to water intoxication, which may result in serious complications such as seizures or coma. Recognizing these symptoms is crucial to maintaining proper hydration while avoiding the risks associated with excessive water consumption.