Definition<unk>  occurs when water intake does not replace free water lost due to normal physiologic processes, including breathing, urination, perspiration, or other causes, including diarrhea, and vomiting.<unk>  can be life-threatening when severe and lead to seizures or respiratory arrest, and also carries the risk of osmotic cerebral edema if<unk>  is overly rapid. The term<unk> " has sometimes been used incorrectly as a proxy for the separate, related condition of hypovolemia, which specifically refers to a decrease in volume of blood plasma. The two are regulated through independent mechanisms in humans; the distinction is important in guiding treatment.
Dehydration
Altitude sickness
Water intoxication
Postural orthostatic tachycardia syndrome  Postural orthostatic tachycardia syndrome  1
Hyperosmolar syndrome
Hypovolemia
Exercise-associated hyponatremia
Stress hyperglycemia