Dehydration
Dehydration occurs when your body loses more fluid than you take in.
Dehydration can be mild, moderate or severe, depending on how much of your body weight is lost through fluids.
Dehydration is caused by not drinking enough fluid or by losing more fluid than you take in. Fluid is lost through sweat, tears, vomiting, urine or diarrhoea.
The best way to treat dehydration is to rehydrate the body by drinking plenty of fluids, such as water, diluted squash or diluted fruit juice.
You should drink plenty of fluids to avoid becoming dehydrated.