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Many people have been there: After a night of one too many martinis, you wake up with a pounding headache and crippling nausea. The hangover has plagued mankind since drinking began, with records of the phenomenon dating back to ancient Egypt.
Despite the hangover's long history, its exact causes are still being parsed out.
"The question is: What's causing the hangover?" said Dr. Robert Swift, a professor of psychiatry and human behavior at Brown University who studies alcoholism. "It could be the alcohol, it could be how it's drunk, it could be the other substances along with the alcohol."
But in any case, "a hangover is a clear indication that you've done something that's not very smart," said James Schaefer, an anthropologist at Union College who specializes in alcohol metabolism research. "It's a warning signal."
While many people have received that warning, there are a number of facts about these dreaded post-imbibing episodes that are not widely known.
Here's a look at 11 things you should know about hangovers:
Smoking can make hangovers worseSlide 2 of 23
Smoking can make hangovers worseSlide 3 of 23
Hangovers are expensiveSlide 4 of 23
Hangovers are expensiveSlide 5 of 23
Darker liquors can cause worse hangover symptomsSlide 6 of 23
Darker liquors can cause worse hangover symptomsSlide 7 of 23
Genetics plays a roleSlide 8 of 23