New Delhi, Jan. 31 -- Waking up after a night of drinks feeling groggy, nauseous and dealing with that pounding headache but while most of us chalk it up to a classic hangover, what if your body is actually trying to tell you something more serious? According to experts, that awful feeling after drinking may not always be due to overindulgence-it could be alcohol intolerance or even an allergy.

"A hangover happens when you drink more alcohol than your body can handle," said Dr Raj Dasgupta, an internal medicine specialist with Huntington Health in Los Angeles. "It's a combination of dehydration, electrolyte imbalance, inflammation, and your liver working overtime to process alcohol."

While unpleasant, a hangover is temporary and can oft...