Most families don’t reach for a clinical checklist when they start to worry about someone they love. They notice smaller things first. A son who used to phone every Sunday goes quiet for weeks. A partner who was always careful with money keeps coming up short. A bright, steady colleague starts disappearing at odd hours and getting prickly when anyone asks why. The worry usually arrives long before the word “addiction” does.
So it helps to know what professionals actually look at when they assess whether someone has a problem with drugs, and where the line sits between heavy use and a diagnosable health condition. This article walks through how substance use disorder is recognised, using the criteria clinicians rely on. It is meant to help you understand what you’re seeing, not to label yourself or anyone else. A real diagnosis can only come from a qualified doctor, psychiatrist, or addiction professional who can assess the full picture.
What “diagnosis” actually means here
There isn’t a single blood test that confirms addiction. A drug test can show what’s in someone’s system, but it can’t tell you whether that person has lost control over their use. Diagnosis is a clinical judgement, made by a trained professional who looks at patterns of behaviour, physical health, and how much the substance has taken over a person’s life.
The framework most clinicians use is the DSM-5, the diagnostic manual published by the American Psychiatric Association. It groups what used to be called “abuse” and “dependence” under one heading: substance use disorder. The World Health Organisation’s ICD-11, used widely across the public health system here in South Africa, describes very similar patterns. Both moved away from older, more judgemental language for a reason. Addiction is understood today as a treatable medical condition that changes how the brain handles reward, stress, and self-control, not a weakness of character or a moral failing.
That shift matters for families too. As the National Institute on Drug Abuse puts it, the words we use shape how willing someone is to ask for help. Talking about “a person living with a substance use disorder” rather than “an addict” keeps the focus on the person, and keeps the door to treatment open.
The eleven signs clinicians look for
The DSM-5 lists eleven criteria for substance use disorder. A professional looks at how many have shown up over a twelve-month period. Two or three point to a mild disorder, four or five to a moderate one, and six or more to a severe substance use disorder. You’ll recognise a lot of these from daily life, which is exactly why a calm, informed eye matters more than a snap judgement.
Clinicians usually sort the eleven signs into four groups.
Losing control over use
- Using more of the substance, or using it for longer, than the person meant to.
- Wanting to cut down or stop, and trying to, but not managing it.
- Spending a lot of time getting the substance, using it, or recovering from its effects.
- Strong cravings, an urge to use that’s hard to think past.
Use that strains daily life
- Use that keeps getting in the way of work, studies, or responsibilities at home.
- Carrying on despite ongoing arguments or damage to relationships caused by the use.
- Giving up hobbies, social plans, or activities that used to matter.
Risky use
- Using in situations where it’s physically dangerous, such as driving.
- Continuing even when the person knows it’s harming their body or mind.
The body’s adjustment
- Tolerance: needing more of the substance to get the same effect.
- Withdrawal: feeling physically or mentally unwell when use stops or drops.
No single item on its own confirms a disorder. Someone prescribed strong pain medication after surgery can develop tolerance and withdrawal without being addicted, for example. It’s the cluster, the way several of these show up together over months, that tells the real story.
When use quietly becomes a pattern
Drug use rarely begins with the intention to lose control. It might start with a social weekend, a prescription, or plain curiosity. One of the clearest early shifts is when occasional use turns into routine. Not every regular user is addicted, but when a substance becomes part of someone’s daily rhythm, that’s worth paying attention to.
It stops being about once-off moments and starts being scheduled. Some people build their day around the next chance to use. The substance is something they think about in the morning, check on through the day, and plan for at night. They begin shaping their choices around access: where they’ll be, who they’ll see, what they can get away with. Break the pattern and they become anxious or irritable.
This often isn’t visible to others straight away. Many people become skilled at hiding it. They still go to work, still turn up to family events, still insist everything is fine. But the use has stopped being occasional. It’s become the way they manage stress, boredom, low energy, even ordinary emotions. That quiet daily role is one of the more telling signs.
Physical signs that keep coming back
Addiction isn’t only in the mind. The body shows it too. Some signs are subtle, others harder to miss: weight that drops or climbs, dull or broken skin, bloodshot eyes, constant sniffing, sleep that’s all over the place. These tend to build slowly. At first it can look like someone is just run down. When it becomes the norm, it points to something deeper.
Long-term use takes a steady toll. Energy drops, the immune system weakens, and the body becomes less resilient. Some people start picking at their skin, shaking, sweating when it isn’t hot, or sleeping through whole days. These aren’t passing flu symptoms. They’re patterns that return.
Withdrawal sharpens the picture. When someone tries to stop, the body can react hard, with nausea, headaches, cramps, and insomnia setting in within hours. That reaction shows how much the system has adapted to the substance. Depending on the drug, stopping suddenly can be genuinely dangerous, which is why medically supervised detox exists rather than expecting anyone to white-knuckle it alone.
Behaviour that starts to shift
Behaviour tells its own story. Someone struggling with addiction often starts acting out of character. They might become secretive, vanish for stretches, or stop answering calls. Things that used to matter, friends, work, hobbies, begin slipping away. There may be unexplained borrowing, odd excuses, or outright lies.
These changes seldom look dramatic at the start. A missed dinner here, a late payment there. Over time the pattern widens. Plans fall through, jobs are lost, responsibilities get dropped. Trust frays, especially when someone keeps promising to do better and keeps slipping back.
Sometimes simple questions trigger sharp defensiveness. Ask about their whereabouts or a change you’ve noticed and you might get anger, or a complete shut-down. This is rarely just moodiness. It’s part of protecting the use. When behaviour starts to look like avoidance, evasion, or chaos, addiction may be underneath it. The warning signs to look out for often cluster rather than appear one at a time.
The mental and emotional changes
The psychological shifts often run deeper than the physical ones. Someone who was calm becomes anxious. Someone driven loses their drive. Mood swings sharpen, warm and sociable one moment, withdrawn or aggressive the next. These aren’t ordinary reactions to a hard day. They’re deeper changes in how a person thinks and feels.
Anxiety becomes a constant companion, not the usual nerves but a low background unease, a sense that they can’t settle unless they’ve used. Depression is common too: a flatness, a loss of interest, an absence of joy even when good things happen. Paranoia can creep in where there’s no real threat, a feeling of being watched or judged. Much of this is the brain reacting to chemical strain, disrupted sleep, guilt, and stress.
There’s an important reason not to read these signs in isolation. Anxiety, depression, and trauma frequently sit alongside addiction, each feeding the other. When a mental health condition and a substance use disorder occur together, clinicians call it dual diagnosis, and it needs treatment that addresses both at once rather than one in isolation.
When the substance starts running decisions
People living with addiction often spend a great deal of time thinking about their next use. This isn’t casual. Cravings aren’t only physical urges. They shape how someone plans their day, deals with people, and makes choices. Meetings get rearranged, events skipped, friends cancelled on, all to make room.
Even when the person knows they’re harming themselves, the craving can still win, because it stops feeling like a want and starts feeling like a need. The brain’s reward system floods with anticipation while the part responsible for weighing consequences goes quiet. That pressure builds until using feels like the only relief.
When someone consistently puts a substance ahead of work, family, and health, it’s more than poor judgement. It shows how much grip the substance has. They may genuinely regret it afterwards, yet in the moment their thinking narrows to a single option.
Why denial is part of the condition, not just stubbornness
Denial isn’t simply a wall someone chooses to put up. It’s something the mind does to protect itself from a frightening truth. Admitting to addiction means admitting that something big has to change, and that can feel unbearable. So the person tells themselves it’s fine. They play down how much they use, shift blame, make promises they can’t keep.
That denial often comes wrapped in defensiveness, anger, sarcasm, accusations that others are controlling or unfair. These reactions usually come from fear rather than spite. The harder someone leans on denial, the harder they are to reach, because in time they start believing their own version. Understanding why denial takes such a strong hold can spare families a lot of needless self-blame, and help them respond with patience instead of confrontation.
Tolerance, dependence, and addiction are not the same thing
These three terms get used interchangeably, but clinicians keep them apart.
Tolerance means the body no longer responds to a substance the way it once did, so the person takes more to get the same effect. This alone can be risky, because climbing doses raise the chance of overdose.
Dependence goes further. The body and mind have adapted so much that stopping brings on withdrawal. The person can feel sick, anxious, or unstable without the substance. Dependence can develop with legitimately prescribed medication and isn’t, by itself, the same as addiction.
Addiction, or severe substance use disorder, is when tolerance and dependence combine with the loss of control and the compulsive, life-narrowing behaviour described above. That’s the point where it isn’t a habit any more, and where stopping alone becomes very hard.
What to do if these signs feel familiar
Recognising the signs in yourself or someone you love is unsettling, but it’s also the first useful step. A few things are worth holding onto.
First, leave the diagnosis to professionals. This article can help you understand what you’re seeing, but only a doctor, psychiatrist, clinical psychologist, or accredited addiction professional can assess and diagnose substance use disorder properly. A GP is a perfectly good place to start the conversation.
Second, addiction is treatable. NIDA describes substance use disorders as treatable chronic conditions from which people recover, much like diabetes or high blood pressure, managed over time rather than fixed overnight. Relapse can be part of that road, and it doesn’t mean treatment has failed.
Third, if you’re worried about someone else, how you raise it matters. Confrontation tends to harden denial. There’s gentler, more effective ground to stand on when you’re supporting a loved one through this, and there are practical approaches for helping someone agree to treatment without forcing the issue.
Frequently Asked Questions
Can I diagnose addiction in myself or a family member?
No. Understanding the signs can tell you whether it’s time to seek an assessment, but a formal diagnosis of substance use disorder needs a qualified professional. They’ll look at the full pattern over time, not a single moment, and rule out other explanations. If what you’re reading here feels close to home, treat it as a prompt to speak to a doctor, not as a verdict.
How many of the signs mean someone has a problem?
Clinicians using the DSM-5 generally look for at least two of the eleven criteria over a twelve-month period. Two or three suggest a mild disorder, four or five a moderate one, and six or more a severe substance use disorder. That said, even one or two signs are reason enough to check in with a professional rather than wait.
Is needing more of a substance over time always addiction?
Not on its own. Tolerance, needing a higher dose for the same effect, can happen with prescribed medicine taken exactly as directed. It becomes more concerning when it sits alongside cravings, loss of control, withdrawal, and use that’s damaging someone’s life. Addiction is about the whole pattern, not one feature.
What’s the difference between dependence and addiction?
Dependence is the body adapting so that stopping causes withdrawal. It can occur without addiction, for instance with certain long-term prescriptions. Addiction adds the loss of control and the compulsive use that crowds out work, relationships, and health. The two overlap but aren’t the same.
Where can someone get help in South Africa?
The Department of Social Development runs a free, confidential, 24-hour Substance Abuse Helpline on 0800 12 13 14 (or SMS 32312), operated through the South African Depression and Anxiety Group. A GP can also refer you on. Freeman House Recovery is available too, and you’re welcome to phone the team directly on +27 12 1111 739 for a private, no-pressure conversation.
You don’t have to be certain to ask for help
You don’t need a diagnosis in hand to reach out. If the patterns here keep matching what you’re living with, that worry is worth acting on. Freeman House Recovery is an exclusive private drug and alcohol rehabilitation centre in Meerhof, Hartbeespoort, registered with the Department of Health and the Department of Social Development under the Prevention of and Treatment for Substance Abuse Act 70 of 2008. The team offers a holistic inpatient programme with medically assisted detox, individual and group therapy, psychiatric assessment, and trauma counselling, and accepts most local and international medical aids.
If you’d like to talk it through, with no obligation, phone Freeman House Recovery on +27 12 1111 739 or email info@freemanhouserecovery.com. Whatever you decide next, asking the question is a sign of strength, not weakness.
