Alcohol hangover is a common problem faced by many people who consume alcohol. It is characterized by a group of unpleasant symptoms that may include headache, nausea, thirst and fatigue. These symptoms appear as a result of the body's reaction to the toxins produced by the breakdown of alcohol in the body. Although there is no specific cure for a hangover, there are things a person suffering from these symptoms can do to alleviate the symptoms and feel better afterwards.