Dehydration occurs when you lose more fluid than you take in, and your body doesn’t have enough water and other fluids to carry out its normal functions. If you don’t replenish lost fluids, you may suffer serious consequences.
Common causes of dehydration include intense diarrhea, vomiting, fever or excessive sweating. Inadequate intake of water during hot weather or exercise also may cause dehydration. Anyone may become dehydrated, but young children, older adults and people with chronic illnesses are most at risk.