There’s no single answer because researchers and clinicians use different frameworks, each designed to describe a different aspect of addiction. The most widely referenced models break addiction into three, four, or five stages depending on whether you’re looking at what happens in the brain, how substance use escalates over time, or how someone moves through recovery. Understanding each framework gives you a more complete picture than any one model alone.
The Three-Stage Brain Cycle
The National Institute on Drug Abuse describes addiction as a repeating loop with three stages, each tied to a specific part of the brain.
- Binge and intoxication. You use a substance and experience its pleasurable or rewarding effects. This activates the basal ganglia, the brain’s reward center, which also drives habit formation over time.
- Withdrawal and negative affect. When the substance wears off, you feel anxious, irritable, or emotionally flat. The extended amygdala, a stress-processing region, drives this unease and makes the absence of the substance feel unbearable.
- Preoccupation and anticipation. You begin thinking about using again, planning how to get the substance, or struggling to resist cravings. This stage involves the prefrontal cortex, which normally helps with decision-making and impulse control but becomes less effective with repeated substance use.
These three stages aren’t a one-time progression. They form a cycle that intensifies with each repetition. Each loop weakens the brain’s ability to regulate reward, stress, and self-control, which is why addiction tends to deepen over time rather than plateau.
The Five-Stage Behavioral Progression
While the brain model describes the cycle someone gets trapped in, a five-stage model maps how a person typically moves from first use to full addiction. This progression can unfold over weeks, months, or years depending on the substance, genetics, and environment.
Initial use is the starting point. It can be as ordinary as a first legal drink, a prescription for pain management, or experimenting with a substance out of curiosity or peer pressure. Not everyone who tries a substance moves to the next stage.
Misuse begins when use becomes recurring or harmful. The World Health Organization defines this as using a substance in a way that causes damage, whether physical, social, or psychological. At this point, the person may not recognize the pattern themselves.
Tolerance develops when the brain adapts to the substance so the original dose no longer produces the same effect. The person increases the amount or frequency of use to chase the feeling they remember. This is a measurable neurological shift. Research shows that repeated exposure to stimulants, for example, reduces the density of dopamine receptors in the brain’s reward system. With fewer receptors available, the brain needs more of the substance to generate the same response, and everyday pleasures start to feel duller by comparison.
Dependence means the brain or body now relies on the substance to function normally. Someone dependent on stimulants may find it impossible to feel pleasure without them, a condition called anhedonia. Someone dependent on alcohol may experience shaking, sweating, or seizures without it. The substance has become the brain’s new baseline.
Addiction is the final stage: compulsive use despite serious consequences. The American Society of Addiction Medicine classifies it as a chronic brain disease affecting reward, motivation, and memory. At this point, the person continues using even when it damages relationships, health, finances, or work. The DSM-5, the standard diagnostic manual, rates severity on a spectrum: meeting 2 to 3 of 11 criteria qualifies as mild, 4 to 5 as moderate, and 6 or more as severe.
Jellinek’s Four Phases of Alcoholism
One of the earliest stage models came from researcher E. Morton Jellinek, who published his findings on the progressive nature of alcoholism in the 1940s and 1950s. His four-phase model was designed specifically for alcohol, but it shaped how clinicians think about substance use disorders broadly.
Jellinek’s phases begin with a pre-alcoholic stage of casual or social drinking, then shift into early-stage alcoholism where drinking moves from social to psychological. The person starts drinking to cope with stress, anxiety, or emotional discomfort rather than to celebrate or socialize. In the middle alcoholic stage, drinking becomes harder to hide and starts causing visible problems: missed obligations, relationship conflict, health issues. The end stage is characterized by chronic, uncontrollable use and serious medical damage. At this point, alcohol-related liver disease, chronic pancreatitis, and elevated cancer risk become real concerns. Alcohol is the leading cause of chronic pancreatitis and a known carcinogen linked to cancers of the mouth, throat, esophagus, colon, liver, and breast.
Warning Signs at Each Transition
The jump from one stage to the next rarely happens overnight, and the early signs are easy to dismiss. During the shift from casual use to misuse, you might notice strong cravings, using more than intended, or gradually needing more to get the same effect. Social changes often appear first: withdrawing from friends, losing interest in hobbies, skipping responsibilities at work or home.
As dependence sets in, the signs become harder to ignore. Mood swings, anxiety, depression, poor self-care, weight changes, and fatigue are common. Some people start lying about their use or taking risks they wouldn’t normally take, like driving under the influence. A hallmark of the later stages is continued use despite clearly knowing it’s causing physical or psychological harm.
The Six Stages of Recovery
Stages don’t just describe the path into addiction. The transtheoretical model, developed by psychologists James Prochaska and Carlo DiClemente, outlines six stages people move through when changing addictive behavior.
Precontemplation is where most people start. They don’t see their behavior as a problem, either because they haven’t experienced consequences yet or because they’re in denial about the ones they have experienced. In contemplation, the person begins thinking about change. They weigh the costs and benefits and eventually decide that something needs to shift. Preparation involves making a concrete plan: deciding what kind of change to make, identifying triggers, gathering resources, and putting support systems in place.
Action is where behavior actually changes. It’s often the most stressful stage, but with good preparation, it can also feel empowering. Maintenance focuses on sustaining those changes over time, continuing the habits and strategies established during the action stage. The sixth stage, relapse, is sometimes included because most people experience setbacks. Lapses or full relapses are common before long-term maintenance takes hold, and the model treats them as a normal part of the process rather than a failure.
Post-Acute Withdrawal and Long-Term Recovery
Even after the action stage, the brain takes time to heal. Post-acute withdrawal syndrome (PAWS) can last anywhere from 6 to 24 months and produces symptoms that catch many people off guard because they don’t resemble the acute withdrawal they prepared for. Common PAWS symptoms include difficulty thinking clearly, short-term memory problems, unpredictable mood swings, sleep disturbances like nightmares or insomnia, physical coordination issues such as dizziness or sluggish reflexes, and heightened sensitivity to stress.
Stress is particularly dangerous during this period because it can intensify every other PAWS symptom simultaneously. Understanding that these symptoms are temporary, even if they last many months, helps explain why recovery feels non-linear and why the maintenance stage of change requires active effort long after someone stops using.