To enable quick and easy diagnosis, proper knowledge of some of the more common symptoms of dehydration is necessary.

A person suffering from dehydration will display the following symptoms:

1. A dry mouth with sticky mucus membrane in the mouth.
2. Decreased urine output.
3. Sunken eyes
4. Wrinkled skin which may lack its normal elasticity and sag back into position slowly when pinched into a fold.
5. Fatigue
6. Dizziness, confusion, and coma
7. Low blood pressure
8. Severe thirst
9. Increased heart-rate and breathing

If you experience any of the above symptoms, or observe them in a friend then you need to get immediate medical attention, and immediate steps should be taken for re-hydration as described in the treatment section.