Addiction explained: how it works

NIDA compares addiction to heart disease. Both disrupt how the body normally works, both can have serious effects, and both are often preventable and treatable.

NIDA says addiction is a treatable disorder. Treatment helps people manage it, much like care for other long-term health conditions.

That means setbacks can happen, and they don’t erase progress. They are a signal to adjust the plan, not a reason to give up.

Doctors talk about substance use disorders as mild, moderate or severe. The most severe end is what most people mean by “addiction”.

In this stage, the basal ganglia (the brain’s reward and habit area) are very active. The brain connects the good feeling to the cues around it, like a certain bar, a time of day or a group of friends.

Over time, those cues alone can set off a strong pull. This is how a habit forms.

Here the extended amygdala, a stress area of the brain, takes over. People may feel uneasy, low, irritable or anxious.

Using again starts to be about relief from feeling bad, not about feeling good. Research on alcohol describes this discomfort as a leading cause of relapse.

The prefrontal cortex helps us plan, decide and put on the brakes. In this stage, it works less well, so it is harder to resist cravings, especially when stressed or reminded of past use.

The cycle then starts again. This is why addiction can feel like being stuck on a loop.

Scientists estimate that genes, including how they respond to life experiences, account for 40 to 60 percent of a person’s risk. Having a mental health condition also raises risk.

Teens are at greater risk because the parts of the brain for decisions and self-control are still developing. Early use is linked to a higher chance of addiction later.

Factors NIDA lists include

• Family members who use substances
• Friends who use
• Little supervision or support from parents
• Struggling at school

The CDC counts growing up in a home affected by substance use or poor mental health among adverse childhood experiences (ACEs). Three in four U.S. high school students reported at least one.

The CDC also says ACEs can be prevented, through safe, stable and nurturing relationships and places for children.

NIDA lists

• Believing in your ability to cope
• Good neighbourhood resources
• Parents who stay involved and supportive
• Positive relationships
• Doing well at school

These involve something taken into the body that acts directly on the brain’s reward system.

Gambling disorder sits in the same chapter as substance use disorders, reflecting how alike they are.

The WHO describes gaming disorder as losing control over gaming, putting it ahead of other parts of life, and carrying on despite harm, usually for at least a year. It affects only a small share of people who play.

Researchers are still debating how best to describe these. Whatever the label, a habit that feels out of control and is causing harm deserves care.

When reward drops and stress rises, the strongest pull is toward relief. For many people, the substance or behaviour has become the fastest way to feel okay.

The brain links the reward to cues around it. Seeing an old friend, driving past a familiar place or feeling stressed can bring the urge rushing back.

NIDA notes that stress can contribute to relapse. That is why recovery plans often focus on calmer routines and support, not just avoiding the substance.

It can seem to help at first. But over time, the stress system becomes more sensitive, and the feelings people were escaping can get stronger.

The American Psychiatric Association notes that substance use may trigger or worsen another mental health condition.

The APA says treatment that fits a person’s whole situation, including any other mental health conditions, is best for lasting recovery.

Questions you can ask a provider

• Can we look at my mood and my substance use together?
• Do you have experience with both?
• What support is there for my family?

Try saying

• “Person in recovery” instead of “former addict”
• “Person with a substance use disorder” instead of “addict” or “user”
• “Substance use disorder” instead of “habit”

Many people absorb the harsh words they’ve heard and use them on themselves. Speaking to yourself as you would to a friend is part of healing.

Ideas

• Gently correct jokes that mock people with addiction
• Share stories of recovery, not just of harm
• Use person-first words yourself

Paths people use

• Faith or cultural communities
• Mutual-help groups
• Peer support
• Recovery community centres
• Treatment with a clinical team

For many people, recovery means better health, steadier relationships, a sense of purpose and a community to belong to. Stopping is one part of it.

Because relapse rates are similar to other long-term conditions, a return to use is a sign to adjust support, not proof that recovery is impossible.

Things that help

• Choose a calm, private moment when they are sober
• Describe what you’ve seen: “I noticed you’ve missed work a few times”
• Listen more than you talk
• Say you care and want to help

Things to avoid

• Labels like “addict” or “junkie”
• Lectures, threats or shaming
• Talking while they are using or upset

Positive relationships are a protective factor against addiction. In recovery, mutual-help groups are the most common kind of support people use.

Ways to build it

• Faith or cultural groups
• Free activities without alcohol
• Peer support or recovery centres
• Volunteering together

Family and friends often feel worried, angry and tired all at once. Groups for families can help you feel less alone.