Substance Use Disorder (SUD) is the current medical and psychiatric term for what most people simply call addiction. When alcohol is the substance involved, the more specific diagnosis is Alcohol Use Disorder (AUD). Both terms are meant to replace older labels like “alcoholic” or “alcohol dependent” — because the newer terms describe the condition more accurately: as a disorder that exists on a spectrum of severity, not as a yes-or-no verdict.
Why the terminology changed #
Anyone who reads about this topic quickly runs into a confusing mix of labels. “Alcoholic,” “alcohol abuser,” “alcohol dependent,” “harmful use” — these terms come from different decades and different diagnostic systems. The two major classification systems in use today aim to clean up the confusion:
The DSM-5 (the American diagnostic manual) merged the old categories of “abuse” and “dependence” into a single diagnosis called Alcohol Use Disorder when it was updated in 2013. The ICD-11 (the WHO’s international classification system, in effect since 2022) uses similar unified language, distinguishing between harmful use, dependence, and episodic harmful use.
The difference from the old system is more than cosmetic. Under the old framework, you were either an “abuser” (not a real problem) or “dependent” (a hopeless case). The new definitions recognize a spectrum — from mild problems all the way to severe dependence. That also changes the clinical approach: early intervention becomes meaningful before severe dependence sets in.
What the diagnosis actually means #
A Substance Use Disorder is present when the use of a substance — in this case, alcohol — leads to clinically significant impairment or distress. In plain terms: consumption is out of control, continues despite obvious harm, and a significant part of daily life revolves around obtaining it, using it, or recovering from it.
The diagnosis is based on eleven criteria — including tolerance (needing more and more for the same effect), withdrawal symptoms, repeated failed attempts to cut back, persistent craving, and neglecting important areas of life. The number of criteria met determines severity: mild (2–3 criteria), moderate (4–5), or severe (6 or more).
What this means for the brain #
Behind the clinical label are concrete biological processes. Alcohol reshapes the brain’s reward system, triggers neuroadaptation — meaning the brain structurally adjusts to the ongoing presence of alcohol — and leaves lasting traces in memory and impulse control. That explains why relapse is not a character flaw but a biologically well-understood risk — one worth knowing about and planning for.
Why “addiction” is still a perfectly good word #
“Addiction” is no longer a formal clinical term — but it’s honest, direct, and universally understood. We use it throughout this site because it says what it means. “Substance Use Disorder” shows up in medical records, therapy reports, and research papers — it’s worth knowing what it means when you encounter it, even if it’s not how you’d ever describe yourself.
What is the difference between Substance Use Disorder, alcohol abuse, and alcohol dependence?
The older terms “abuse” and “dependence” have been replaced in modern diagnostic systems (DSM-5, ICD-11) by the unified term Substance Use Disorder, or Alcohol Use Disorder when alcohol is involved. Instead of a hard dividing line, there is now a severity spectrum: mild, moderate, or severe — depending on how many of the eleven diagnostic criteria apply.
Does a diagnosis of Substance Use Disorder mean I'm an alcoholic?
The word “alcoholic” is no longer a formal medical term, though it remains in everyday use. A Substance Use Disorder can be mild, moderate, or severe. Even someone with relatively early-stage problems may already meet the criteria — and knowing that sooner rather than later is genuinely useful.
How many criteria have to be met for a Substance Use Disorder diagnosis?
According to the DSM-5, at least two of eleven criteria must be present within a twelve-month period. These include loss of control over consumption, tolerance, withdrawal symptoms, continued use despite clear harm, and strong cravings, among others.
Can Substance Use Disorder be cured?
Full “cure” isn’t typically the framework used — the more common term is remission, meaning the diagnostic criteria are no longer met. Many people achieve lasting sobriety and stable lives. The biological changes alcohol makes in the brain do persist, however, which explains the ongoing risk of relapse even after long periods of abstinence.
Bernd Guzek, MD, PhD #
Physician, author & co-founder of Bye-Bye-Booze
Specialized in biochemical mechanisms of addiction and brain metabolism.
