The prime objective of this article is to know about dehydration. Dehydration happens when water loss exceed water intake, typically due to exercise or illness. The majority people can endure a three to four percent reduce in body water without complexity. A five to eight percent reduce can reason fatigue and dizziness. Over ten percent can reason physical and mental deterioration, accompanied by severe thirst. A decrease more than fifteen to twenty five percent of the body water is invariably serious.