November 12, 2026
Substance use disorder develops gradually. By the time a family notices something is wrong, the pattern has usually been building for months. That is why the most useful thing a loved one can do is pay attention to changes that repeat, rather than waiting for one dramatic event to prove that something is serious.
Physical changes worth noticing
Frequent bloodshot eyes or dilated pupils, sudden weight loss or gain, changes in sleep and appetite, poor coordination, slurred speech, or repeated unexplained injuries can all point to substance use. None of these on its own means addiction — many have ordinary medical explanations. What matters is a cluster of changes that persists and gets harder to explain.
Behavior and mood changes
The warning signs families describe most often are about who the person is becoming, not what they are taking. Pulling away from family and old friends, a sudden new social circle, secrecy about phone or whereabouts, and losing interest in hobbies or activities they used to care about are common. Mood swings, irritability, or defensiveness when you ask a simple question about their day can also show up.
Money and time are often the first concrete evidence. Unexplained borrowing, missing cash or valuables, unexplained gaps in the week, or repeated excuses about being late can indicate that obtaining and using substances is taking priority over everything else.
Decline at work, school, or home
Missed shifts, sudden drop in grades, forgotten responsibilities, driving incidents, or new legal problems are all red flags. People with an untreated substance use disorder often keep these areas of life from falling apart for a surprisingly long time — which is exactly why the problem keeps growing while it stays invisible.
How to bring it up
Choose a calm moment, not during an argument or after a crisis. Describe what you have seen in specific terms rather than labeling them: "I noticed you missed work three times this month and you seemed sick on Sunday" is harder to argue with than "you have a problem." Use "I" statements, say what you are worried about, and offer a concrete next step — offering to help schedule an evaluation is often more effective than a demand.
Avoid blame, ultimatums you are not prepared to enforce, and covering up consequences. Protecting someone from the results of their use tends to delay the moment they decide to do something about it. Setting a kind, firm boundary and then holding it is more helpful than a dramatic confrontation.
Let a professional sort out what is going on
A substance use evaluation is a structured conversation about what someone is using, how often, and what else is going on in their health and life. That last part matters: anxiety, depression, chronic pain, sleep apnea, and past trauma frequently sit underneath substance use, and treating one without the other rarely works. A clinician can tell the difference between risky use, a developing disorder, and a medical condition that mimics one.
If you are worried about someone right now because they are unconscious, having a seizure, or you suspect an overdose, call 911 immediately. If you are worried they may hurt themselves, call or text 988 for the Suicide and Crisis Lifeline. Both are free, confidential, and available any hour.
You do not need a diagnosis, insurance confirmation, or proof before making a phone call. If something about someone you love has changed and stayed changed, it is worth finding out why.