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A hangover (veisalgia) describes the sum of unpleasant physiological effects following heavy consumption of drugs and liquor, particularly alcoholic beverages. The most commonly reported characteristics of a hangover include headache, nausea, sensitivity to light and noise, lethargy, depression and thirst.



Symptoms
An alcohol hangover is associated with a variety of symptoms that may include dehydration, fatigue, headache, nausea, vomiting, diarrhea, weakness, elevated body temperature, hypersalivation, difficulty concentrating, anxiety, irritability, sensitivity to light and noise, erratic motor functions, and trouble sleeping. Many people will also be repulsed by the thought or taste of alcohol during hangover. The symptoms vary from person to person, and occasion to occasion, usually beginning several hours after drinking. It is not clear whether hangovers affect cognitive abilities.

- Wikipedia