a combination of dehydration, vascular changes in the body and brain and a reaction to one or more of the congeners

a complicated biological derivative and is affected by widely varying factors including physiology, the specific alcohol involved and even the person's emotional state, according to howstuffworks

a form of poisoning

a kind of drug withdrawal, the result of sinking blood-alcohol levels which affect the brain after high levels have been reached

a microcosm of addiction, withdrawal and recovery

an umbrella term that describes what's happening to your body as it recovers from the poison you ingested the night before

a set of symptoms experienced by some after a period of heavy consumption of alcohol

a sign of alcohol poisoning and is the

a sign of dehydration, caffeine causes dehydration

a sign of dehydration due to excessive drinking

a toxic hypoglycemic attack brought about by drinking too much alcohol

The unpleasant after effects of drinking too much alcohol.

withdrawal symptoms from prior alcohol consumption (ex. headache, nausea, vomiting, stomach irritation..)

is the unpleasant consequence of excessive alcohol consumption. It is often characterized by headache, fatigue and/or nausea. It can be prevented by not over-consuming alcohol.

Unpleasant physical effects immediately following the abuse of alcohol. Reference: A1

headache and other negative effects usually felt the morning after consuming alcohol or other drugs

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