Which condition involves an abnormally low level of sodium in the blood?

Exertional hyponatremia is a medical condition characterized by an abnormally low concentration of sodium in the blood, typically resulting from an imbalance between sodium and water intake during physical activity. This condition often occurs when athletes consume excessive amounts of water without adequate sodium replenishment, especially in endurance events or prolonged physical exertion.

Symptoms of exertional hyponatremia can include headaches, nausea, confusion, and in severe cases, seizures or coma. This condition highlights the importance of maintaining proper electrolyte balance during extended workouts or competitions, ensuring that athletes not only hydrate but also replenish essential minerals like sodium to support optimal physiological function.

In contrast, malignant hyperthermia relates to a severe reaction to anesthesia and does not involve sodium levels, while acute exertional rhabdomyolysis refers to muscle breakdown and elevated creatine kinase levels, rather than sodium imbalance. Mild dehydration indicates a deficit in total body water but does not specifically denote low sodium levels in the blood.