Addiction is a chronic medical condition defined by compulsive use of a substance or engagement in a behavior despite harmful consequences. The key distinction is not how much you use or how often, but whether you’ve lost control over the behavior and continue it even as it damages your health, relationships, or daily life. Clinically, meeting just 2 out of 11 specific criteria is enough to qualify as a mild substance use disorder.
The 11 Criteria That Define Addiction
The standard diagnostic framework lists 11 signs that a person’s relationship with a substance has crossed into disorder. You don’t need all of them. Meeting any 2 or 3 qualifies as a mild substance use disorder, 4 or 5 as moderate, and 6 or more as severe. The criteria are:
- Using more than intended: You regularly consume larger amounts or use for longer stretches than you planned.
- Wanting to cut back but failing: You’ve tried to reduce or stop and couldn’t sustain it.
- Time consumed: A significant portion of your day goes to obtaining, using, or recovering from the substance.
- Cravings: You feel a strong, pressing urge to use.
- Neglected responsibilities: Your performance at work, school, or home has slipped because of use.
- Social problems: You keep using even though it’s causing conflict with people close to you.
- Giving up activities: Hobbies, social events, or professional opportunities fall away because substance use takes priority.
- Risky situations: You use in physically dangerous settings, like driving or operating equipment.
- Continued use despite harm: You know the substance is making a physical or mental health problem worse and use anyway.
- Tolerance: You need increasingly larger amounts to get the same effect.
- Withdrawal: You experience physical or psychological symptoms when you stop, and you seek the substance to relieve them.
Notice that tolerance and withdrawal are only 2 of the 11 items. A person can meet the threshold for addiction without ever experiencing either one.
Dependence and Addiction Are Not the Same Thing
This is one of the most widely misunderstood distinctions in medicine, and it has real consequences. Physical dependence means your body has adapted to a substance so that stopping it triggers withdrawal symptoms. This happens with many medications that aren’t addictive at all, including certain antidepressants and blood pressure drugs. Nearly everyone who takes opioids for several months will develop physical dependence, but only around 8% or fewer of those patients develop addiction.
The reverse is also true. People can have a full-blown addiction without dramatic physical withdrawal. Cocaine, for example, doesn’t cause the visible withdrawal symptoms (vomiting, sweating, tremors) that alcohol or heroin do. But people who use cocaine often experience severe cravings and repeatedly return to it despite serious consequences. That pattern of compulsive use in the face of harm is what defines addiction, not whether your body shakes when you stop.
This confusion causes real problems in medical settings. Clinicians sometimes see tolerance and withdrawal in a patient and assume addiction, leading to undertreated pain. And people sometimes dismiss their own problem because they don’t experience physical withdrawal, not realizing that the loss of control over their behavior is itself the core issue.
What Happens in the Brain
Addiction involves lasting changes to how the brain processes reward, motivation, and decision-making. When you take a drug that produces pleasure, it triggers a surge of dopamine in the brain’s reward center. With repeated exposure, the brain adjusts. Dopamine receptors decrease in number, which means everyday pleasures (food, conversation, exercise) produce less satisfaction than they used to. You need more of the substance just to feel normal.
At the same time, the areas of the brain responsible for judgment, impulse control, and long-term planning become less active. This is why addiction looks irrational from the outside. The parts of the brain that would normally pump the brakes on a bad decision are functioning at reduced capacity, while the parts screaming for the substance are firing at full volume. These brain changes can persist for years after someone stops using, which helps explain why addiction behaves like a chronic illness rather than a one-time problem.
Behavioral Addictions Are Real, but Few Are Recognized
Most clinical frameworks for addiction focus on substances: alcohol, opioids, stimulants, nicotine, cannabis, and others. But the same pattern of impaired control, escalating priority, and continued use despite consequences can apply to behaviors too.
Gambling disorder has been recognized for years. More recently, the World Health Organization added gaming disorder to its international classification system. To qualify, the pattern has to be severe enough to significantly impair a person’s functioning in personal, family, social, or work life, and it typically needs to be present for at least 12 months.
Many behaviors that people casually call “addictions” (shopping, social media, pornography, food) are not formally classified as addiction disorders, though researchers continue to study them. The distinction matters because calling something an addiction implies a specific pattern of brain changes and loss of control, not just a strong habit or something you enjoy a lot. A habit you can put down when the stakes get high enough is not the same as a compulsion you continue despite losing your job or your family.
Why Addiction Keeps Coming Back
Addiction is classified as a chronic medical disease, in the same category as diabetes or hypertension. The American Society of Addiction Medicine defines it as a condition involving complex interactions among brain circuits, genetics, environment, and life experiences. This framing matters because it shapes expectations about treatment and recovery.
Relapse rates reflect this chronic nature. More than two-thirds of people relapse after initiating treatment, and studies tracking one-year outcomes across alcohol, nicotine, and illicit drugs show relapse rates above 85%. In the first 90 days after treatment, 65% to 70% of people return to use. These numbers aren’t signs of failure. They’re comparable to relapse rates for other chronic conditions where patients stop following treatment plans. The difference is that when someone with diabetes has a blood sugar spike, we call it a setback; when someone with addiction relapses, many people call it a character flaw.
Prevention and treatment approaches for addiction are generally as successful as those for other chronic diseases when sustained over time. The key word is sustained. Like managing blood pressure, managing addiction typically requires ongoing effort, not a single intervention.
How Addiction Gets Assessed
If you’re wondering whether your own use qualifies, healthcare providers use several validated screening tools. Common ones include the Drug Abuse Screen Test (DAST-10), a 10-question questionnaire about your drug use patterns, and the TAPS tool, which screens for tobacco, alcohol, prescription medication, and other substance use. For adolescents, specific tools like the CRAFFT screener are designed for younger populations.
These screening tools aren’t diagnostic on their own. They flag whether a more thorough evaluation is warranted. A full assessment involves looking at which of the 11 criteria you meet, how many, and how severely they’re affecting your life. The severity scale (mild at 2 to 3 criteria, moderate at 4 to 5, severe at 6 or more) guides what level of treatment makes sense.
The threshold is lower than most people expect. You don’t need to have lost everything, hit “rock bottom,” or be physically dependent. Two criteria, perhaps using more than you intend and unsuccessfully trying to cut back, already meets the clinical definition of a mild substance use disorder. That’s by design: catching the pattern early, before severe consequences accumulate, gives treatment the best chance of working.