Why does caffeine make you thirstier?
342682
Caffeine is a dieuretic.  It makes water leave your tissues. \n\nH20 is much betta!
1016846
Your skin felt the need for moisture.  The temperature of the water as well as the humidity of your surroundings will affect it also.  You could have had something to drink that dehydrated you a little.  You could of been thirsty and didn't know it.  Lots of reasons.\n\nJust be thankful that your body is created in such a way to handle this without you having to think about it.
617917
Dont worry about it. I drink alot of espresso, especially during my testing blocks in med school. My urine smells like coffee too. When you drink alot of caffeine, your body is unable to produce ADH (anti-diuretic hormone) so you tend to urinate often. Your body will filter alot of the coffee that you are putting into your body. It will be in high concentration so in essence, smelling that in your urine is letting you know that your body's filtration system is working. Keep drinking water so you dont get dehydrated.
500226
YOU WILL BECOME DEHYDRATED BECAUSE THE WATER IN COFFEE AND TEA HAS LOTS OF CAFFEINE IN IT WHICH DEHYDRATES YOU, YOU ACTUALLY HAVE TO DRINK more WATER THAN SOMEONE WHO DOESNT DRINK COFFEE.
822659
they keep you up for a couple of hours then you get really sleepy if you miss the next dose, i dont like the effect of caffeine in my body, but if you drink coffee everyday you might like it.
55836
Caffeine has been used in weight-loss pills.  It is a stimulant which makes you more active (burning up more calories and having more drive to accomplish things).  Caffiene is also a diurectic causing you to lose retained water (and weight).  However, you should maintain adequate hydration to perhaps avoid headache and other side effects.  Although caffiene may help, a healthy diet and exercise should be the foundation of weight loss, and not too much caffeine.
44619
Yes it does, Caffine quickens the heart rate, and it is also addicting.
605359
I used to have the problem, you're having withdrawl from caffiene when you get the headache. You could also be having other symptoms and not even noticing it. Check out my source if you want to know more. They have quite a bit!
277755
Caffine is a stimulant. Too much can make your heart start to beat too fast, smong other things.
122974
"bred2bbroken" covered the question well.  I add one interesting tidbit to his answer.  The sensors that tell your body that you are thirsty are in your head.  With all that blood and bodily fluids moving away from your feet and towards your head (due to the absence of gravity), you do not feel thirsty.  This causes a problem during reentry.  Suddenly, you are severely dehydrated.  This can lead to lapses in judgement, etc.  Astronauts, therefore, drink a gallon of water during their final orbit.  If reentry has to be delayed, due to adverse weather conditions or whatever, then they have to orbit again.  Guess where all that water goes?  :)  So, they make one pass around, which takes a little over an hour, and then they have to chug a gallon of water again!  :)
622811
The Diagnostic and Statistical Manual (DSM-IV-TR)describes Caffeine Intoxication as having at least 5 of the following symptoms and recent ingestion of at least 250mg of caffeine:\n(1)restlessness, (2) nervousness, (3) excitement, (4) insomnia, (5) flushed face, (6) diuresis (frequent urination), (7) gastrointestinal disturbance, (8) muscle twitching, (9) rambling flow of thought and speech, (10) tachycardia or cardiac arrythmia, (11) periods of inexhaustability, and (12) pscyhomotor agitation.\n\nI am not sure about "overdose" as you ask the question.
1132795
Because the diabolical megabucks conglomerate Coca Cola corporation knows if you pee more, then you'll drink more.\n\nSo they have many evil genius mad scientists who slave day and night, make arcane encantations to unholy dark lords, and barter with extraterrestrials and beings from warped dimensions to produce additives which they add to cauldrons of bubbling Coke while dancing naked and teasing poor teenagers with acne for the sole purposes of making you pee more so you'll drink more Coca-Cola.\n\nNow, if you want to know why you're always thirsty right after you finish a Coke, well.................
44368
Caffeine is a diuretic, so it makes you have to go pee. You'll only gain the weight until you go to the bathroom. \n\nAnd who drinks 4 lbs of Pepsi a day??
35928
i find that if i stay hydrated and drink lots of water during that day i dont get headaches and am generally much more energetic. i can also think better and dont feel sluggish and blah. try drinking more water. that could be the problem right there! also, anything with caffeine doesn't count as staying hydrated. so no coffee, soda.....caffeine actually dehydrates you.
299009
Another reason could be you have simply had too much caffeine and/or not enough sleep.  If I drink too much coffee and eat chocolate, my eye twitches.
1097825
Decaffeinated Coffee still has Caffeine in it so it remains a diuretic and therefore is dehydrating. For every cup of Decffeinated coffee, you would need to drink 3 glasses of clean water just to break even. \n\nYou could get water from juiced fruits or juicy fruits  like watermellons, cantalope, etc... but not decafeinated coffee. Nice try...
803658
Maybe you aren't drinking enough water. You need at least 8, 8 oz. cups of water a day. When you don't drink enough you are smothering your blood cells. There is a lack of oxygen. I was doing really well drinking my 8 glasses a day and I was full of energy. I have stopped drinking the water though against my better judgment. I have never really been a fan and I love Pepsi. I end up drinking too much soda and not enough water. I need to get my act together too. It's funny, I know for a fact that more water means more energy but for some reason I choose to ignore this fact. Not very smart huh...