alcohol dependence
Meaning of alcohol dependence: The point at which the nervous system has rearranged itself around alcohol, so stopping produces withdrawal and drinking keeps that at bay.
Definition of alcohol dependence
Alcohol dependence is a long-standing pattern of drinking in which the body has adapted to alcohol, so more is needed for the same effect and stopping brings on withdrawal symptoms. Craving and difficulty limiting intake accompany those physical changes. Current diagnostic manuals fold the older categories of dependence and abuse into one graded condition named alcohol use disorder.
What has changed in the nervous system?
Alcohol strengthens the brain's main calming signal and weakens its main excitatory one, which is why a drink is sedating. Faced with that pressure day after day, the brain compensates in the opposite direction, turning the calming system down and the excitatory system up so that ordinary function is restored while alcohol is present. Remove the alcohol and the compensation stands exposed. An overexcited nervous system produces tremor, sweating, racing heart, anxiety and disturbed sleep, and at the severe end seizures and a confused agitated state.
Is dependence the same as addiction?
No, although they overlap heavily here. Physical dependence means tolerance and withdrawal, a predictable adaptation that also develops in people taking prescribed medicines exactly as directed and implies nothing about their behavior. Addiction describes compulsive use that continues despite harm, with craving and a narrowing of priorities around obtaining the substance. Someone can be physically dependent without being addicted. In heavy long-term drinking the two usually arrive together, which is how the words came to be treated as interchangeable.
How do the labels line up?
| Term | Standing |
|---|---|
| Alcohol use disorder | The current diagnosis, graded from mild to severe |
| Alcohol dependence | Older term, emphasizing tolerance and withdrawal |
| Alcoholism | Older and largely non-technical, still widely used |
| Alcohol abuse | Older term for a harmful pattern without dependence |
What harm follows?
Beyond the liver, which is the organ most people think of, sustained heavy intake damages the pancreas, the heart muscle, the peripheral nerves and the memory circuits, the last often through thiamine deficiency rather than through alcohol directly. Alcohol is also classified as a cause of cancer in humans, with the mouth, throat, voice box, esophagus, liver, bowel and breast among the sites linked to it.
Also known as
Used in a sentence
The history was consistent with alcohol dependence over several years.
Good to know
Withdrawal after long-standing heavy drinking is one of the few withdrawal states that can prove fatal, since seizures and a severe confused state may follow abrupt cessation, and physical dependence by itself is not the same thing as addiction.