You will reach

"Chemical Balance" when You are dead.

Georg

Well put! As asked, the question was not physiologically or chemically meaningful.

Don't be so harsh fellahs. This isn't a tutorial and the questioner didn't mention toxins or Qi or yin and yang. It might be a badly phrased question but his meaning is not to hard to fathom. The most surprising thing is that many explanations and cures for hangovers always appear in newspapers and colour supplements in December and I don't know how the OP missed them all.

Cutting a long story short: alcohol is a poison. Shove it into your body faster than your body can get rid of it and you'll be very ill indeed. If you are unfortunate or stupid enough, you can kill yourself in short order - and I don't mean waiting for your liver to fail.

I'm an ex-drinker myself. Not an alcoholic - I just watched one alcoholic too many and decided the whole thing was silly. When I think of the time and money I wasted, I wonder why I waited till my thirties to stop drinking. If you must drink, enjoy it in quantities that don't give you a hangover. (If you love the flavours of good malt or top-notch bordeaux, then you could learn to swill it and spit it.)

As for the causes (apart from the obvious) there's a perfectly good Wikipedia page at http://en.wikipedia.org/wiki/Hangover

Cures? Nothing works. Try hydrating before going to bed - a litre or so of tap water. It's far better for your body if you drink the water instead of the alcohol rather than after the alcohol.

Pete is right, but maybe this should be explained a little further.

The human body has a capacity to metabolise alcohol. If the rate of alcohol consumption is higher than the rate in which the body can metabolise alcohol, the body will try different ways of getting rid of the alcohol. One way is diluting the alcohol and excreting it. But this also means that the body is confronted with a shortage of liquid (usually of water). Consuming large amounts of water after a bender is usually a good way to prevent a hangover (depending on the intake of alcohol of course). If you drink water with an astringent (like tea) the effect will probably be even greater.

But as Pete correctly surmises, it is better to restrict alcohol consumption than to remedy the effects of overconsumption.