The CAGE questionnaire, the name of which is an acronym of its four questions, is a widely used method of screening for alcoholism.Two "yes" responses indicate that the respondent should be investigated further. The questionnaire asks the following questions:

• Have you ever felt you needed to Cut down on your drinking?
• Have people Annoyed you by criticizing your drinking?
• Have you ever felt Guilty about drinking?
• Have you ever felt you needed a drink first thing in the morning (Eye-opener) to steady your nerves or to get rid of a hangover?

The CAGE questionnaire, among other methods, has been extensively validated for use in identifying alcoholism.CAGE is considered a validated screening technique, with one study determining that CAGE test scores >=2 had a sensitivity of 93% and a specificity of 76% for the identification of problem drinkers.It is not valid for diagnosis of other substance use disorders, although somewhat modified versions of the CAGE are frequently implemented for such a purpose.