Hangover is an old time alcoholic related problem. But it’s cases are rapidly increasing in current century. In simple term hangover is an over consumption of alcohol which causes headache with the unpleasant physiological effects.
In medical term drinking too much causes the body to dehydrate. It also causes the drinker to urinate more, losing more fluids from the body. It is the dehydration of the brain that causes the intense headaches of a hangover.