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 a 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. In one extreme case, John O Callaghan (famous Irish playwright), actually physically turned green and is reported to have suffered for 3 days. During those days he famously declared "I'm never drinking again", and he never did.
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