Alcoholism, also known as alcohol use disorder (AUD), is a broad term for any drinking of alcohol that results in mental or physical health problems.[12] The disorder was previously divided into two types: alcohol abuse and alcohol dependence.[1][13] In a medical context, alcoholism is said to exist when two or more of the following conditions are present: a person drinks large amounts over a long time period, has difficulty cutting down, acquiring and drinking alcohol takes up a great deal of time, alcohol is strongly desired, usage results in not fulfilling responsibilities, usage results in social problems, usage results in health problems, usage results in risky situations, withdrawal occurs when stopping, and alcohol tolerance has occurred with use.[1] Risky situations include drinking and driving or having unsafe sex, among other things.[1] Alcohol use can affect all parts of the body, but it particularly affects the brain, heart, liver, pancreas and immune system.[3][4] This can result in mental illness, Wernicke–Korsakoff syndrome, irregular heartbeat, liver cirrhosis and increased cancer risk, among other diseases.[3][4] Drinking during pregnancy can cause damage to the baby resulting in fetal alcohol spectrum disorders.[2] Women are generally more sensitive than men to the harmful physical and mental effects of alcohol.[9]
In the United States and Canada, AA meetings are held in hundreds of correctional facilities. The AA General Service Office has published a workbook with detailed recommendations for methods of approaching correctional-facility officials with the intent of developing an in-prison AA program.[79] In addition, AA publishes a variety of pamphlets specifically for the incarcerated alcoholic.[80] Additionally, the AA General Service Office provides a pamphlet with guidelines for members working with incarcerated alcoholics.[81]
Some of the divide between 12-Step recovery and academic addiction medicine came about because of resistance by some AA members to the use of any pharmaceuticals whatsoever. Newcomers were told to abandon any and all medications. While this attitude is receding, stories of members with advanced cancer refusing opiates are still told with admiration in meetings. 
Alcohol exerts a depressive effect on the brain. The blood-brain barrier does not prevent alcohol from entering the brain, so the brain alcohol level will quickly become equivalent to the blood alcohol level. In the brain, alcohol interacts with various neurotransmitters to alter nerve function. Alcohol's depressive effects result in difficulty walking, poor balance, slurring of speech, and generally poor coordination (accounting in part for the increased likelihood of injury). The affected person also may have impairment of peripheral vision. At higher alcohol levels, a person's breathing and heart rates may be slowed and vomiting may occur (with a high risk of the vomit being breathed into the lungs, potentially resulting in aspiration pneumonia.) Still higher alcohol levels may result in coma and death.

The World Health Organization estimates that as of 2010 there are 208 million people with alcoholism worldwide (4.1% of the population over 15 years of age).[9][10] Substance use disorders are a major public health problem facing many countries. "The most common substance of abuse/dependence in patients presenting for treatment is alcohol."[125] In the United Kingdom, the number of 'dependent drinkers' was calculated as over 2.8 million in 2001.[148] About 12% of American adults have had an alcohol dependence problem at some time in their life.[149] In the United States and Western Europe, 10 to 20 percent of men and 5 to 10 percent of women at some point in their lives will meet criteria for alcoholism.[150] Estonia had the highest death rate from alcohol in Europe in 2015 at 8.8 per 100,000 population.[151] In the United States, 30% of people admitted to hospital have a problem related to alcohol.[152]

Twelve-step methods have been adapted to address a wide range of alcoholism, substance-abuse and dependency problems. Over 200 self-help organizations—often known as fellowships—with a worldwide membership of millions—now employ twelve-step principles for recovery. Narcotics Anonymous was formed by addicts who did not relate to the specifics of alcohol dependency.[3]