Hangover

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

Hypoglycemia, dehydration, Acetaldehyde intoxication, and vitamin B12 deficiency are all theorized causes of hangover symptoms. Hangovers usually last 12 to 36 hours, although some have been reported to last 48 to 72 hours after alcohol was last consumed.