Alcohol addiction, like any other addiction, occurs when the brain becomes dependent on alcohol to function normally. Alcohol changes the levels of certain chemicals in the brain, such as dopamine, which is responsible for feelings of pleasure and reward. With repeated use, the brain becomes accustomed to the increased levels of dopamine caused by alcohol and eventually comes to rely on it to feel normal. This dependence can lead to cravings and compulsive alcohol use, despite negative consequences. Additionally, there may be genetic or environmental factors that can contribute to the development of alcohol addiction.