Alcohol dependence or alcoholism is the most severe form of alcohol abuse.
Alcoholism is a type of drug addiction.
Physical dependence reveals itself by withdrawal symptoms when alcohol intake is interrupted, tolerance to the effects of alcohol, and evidence of alcohol-associated illnesses. Alcohol affects the central nervous system as a depressant, resulting in a decrease of activity, anxiety, tension, and inhibitions. Even a low level of alcohol within the body slows reactions. Concentration and judgment become impaired. In excessive amounts, intoxication or poisoning results.