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A hangover (veisalgia) is the sum of unpleasant physical effects following heavy consumption of alcohol. The most common reported characteristics of a hangover are feelings of extreme thirst, lethargy, nausea, sensitivity to sunlight and noise, and headache. Hypoglycemia, dehydration, and vitamin B12 deficiency are all theorized causes of hangover symptoms.

Symptoms


An alcohol hangover is associated with a variety of symptoms that may include dehydration, tiredness, headache, nausea, diarrhea, weakness, difficulty concentrating, anxiety, irritability, sensitivity to light and noise and trouble sleeping. 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.

Causes


Hangovers are multi-causal. Ethanol has a dehydrating effect (such substances are known as diuretics), which causes headaches, dry mouth, and lethargy. Dehydration causes the brain to shrink away from the skull slightly. This can be mitigated by drinking water after consumption of alcohol. Alcohol's impact on the stomach lining can account for nausea. Due to the increased NADH production during metabolism of ethanol by alcohol and aldehyde dehydrogenases, excess NADH can build up and slow down gluconeogenesis in the liver, thus causing hypoglycemia.

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RT @svveeper: what if alcohol lowers your resistance to ghosts? what if hangovers are just ghosts fuckin' with you?
gloriawandrous (gloriawandrous) Wed, 16 May 2012 10:24:19 -0000
RT @svveeper: what if alcohol lowers your resistance to ghosts? what if hangovers are just ghosts fuckin' with you?
I never get two day hangovers. #whynow
StaceyLEndres (Stacey Endres) Wed, 16 May 2012 10:23:53 -0000
I never get two day hangovers. #whynow
RT @ComedyPosts: Alcohol doesn't cause hangovers... waking up does.
evancote8 (Evan) Wed, 16 May 2012 10:23:14 -0000
RT @ComedyPosts: Alcohol doesn't cause hangovers... waking up does.
This time of year is such a happy time, full of festivities and letting off steam from the year gone by... and hangovers.
ShivBhanderi (Shiv Bhanderi) Wed, 16 May 2012 10:23:04 -0000
This time of year is such a happy time, full of festivities and letting off steam from the year gone by... and hangovers.
RT @ComedyPosts: Alcohol doesn't cause hangovers... waking up does.
JustB_Different (♫⚡ Shaheed Bryant ⚡♫) Wed, 16 May 2012 10:23:00 -0000
RT @ComedyPosts: Alcohol doesn't cause hangovers... waking up does.
@GoodManBill Well that works a treat then!! Too much fun with the lady boys can cause killer hangovers!!
fayeg1989 (Faye Gunner) Wed, 16 May 2012 10:22:21 -0000
@GoodManBill Well that works a treat then!! Too much fun with the lady boys can cause killer hangovers!!

 
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