How can we tell if we are really dehydrated?

Question:

Answers:
If you can see your finger nails (as in they are not covered up). If your nails have a yellow tent to them. If you skin is dry. If you get dizzy spells or feel light headed. The last two are in extreme cases.

Other Answers:
You feel tired and thirsty. Your pee is darker than usual.

Your performance declines well before you feel dehydrated. You should drink enough water to prevent yourself from ever having dehydration symptoms.

First sign, you will be thirsty.
When playing a sport, you will start to get cramps.
When at work or relaxed, you will feel tired, your eyes will feel dry, your mouth you, will become fatigued among other things happening inside your body which will result in a total colapse.

Drink water and avoid sugar and caffeine.
Source(s):
http://www.nlm.nih.gov/medlineplus/ency/article/000982.htm

me, my tongue gets all dry.

your mucus membranes will be dry, pinch you skin and pull it up if it stays, tenting, a sign of dehydration, obviously thirst actually if you wait until you're thirsty you've waited too long. increased pulse rate and decreased blood pressure and orthostatic hypotension ( if you stand up too quickly you get dizzy) or capillary refill over 2 seconds ( pinch your fingernail to blanch it then count how long it takes to flush again should be under 2 seconds)

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How can we tell if we are really dehydrated?

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