Phase 1 · Understand the Body — Why the disease behaves the way it does.
The One-Line Truth
The whole disease in one chain
Everything on this page exists to explain this line.
Alcohol Use Disorder (AUD) is diagnosed when someone shows 2 or more of 11 behaviors within 12 months—like needing more alcohol to get the same effect (tolerance), feeling sick when stopping (withdrawal), or continuing to drink despite harm to health, work, or relationships.
A Home's Electrical System in Overload
Picture a house's electrical system with two opposing forces: a dimmer switch (GABA, the calming system) that can turn lights down, and a breaker panel (NMDA glutamate receptors, the activating system) that sends power surging through. Alcohol is like temporarily adding extra dimmers to calm everything down—the house feels peaceful and stable. But the electrical company (your brain's neurons) notices the extra dimmers are always being used, so it removes some of them and installs extra breakers to try to restore balance—this is neuroadaptation, and it creates tolerance. When you suddenly shut off the alcohol (unplug the temporary dimmers), the breakers that were compensating now flood the house with uncontrolled power: lights flicker wildly, circuits overheat, and the whole system can catch fire—this is withdrawal and seizures. Meanwhile, the house's control panel (prefrontal cortex) that decides whether to flip switches gets damaged and can no longer override the chaos, so even when the owner knows they should stop drinking, they can't pump the brakes.
APA DSM-5-TR 2022 · ASAM National Practice Guideline for Alcohol Use Disorder 2020 · SAMHSA TIP 45 Detoxification and Substance Abuse Treatment 2015 · VA/DoD Clinical Practice Guideline for Substance Use Disorders 2021 · reviewed 2026-07-07