Occurs when the body loses too much fluid which may occur due to a lack of water intake, diarrhea, vomiting, sweating, or exercise.
It may cause muscle cramps and a feeling of faintness. In severe cases the body does not have enough fluid to get blood to your organs, and may cause shock, which is a life-threatening condition.
It can occur in any age, but it is most dangerous for babies, small children, and older adults.