Signs and symptoms of opioid use disorder
How to tell when opioid use has become a disorder, in yourself or in someone you love, and when it is time to get help.
Find treatment near youUpdated October 2026. Sources are linked on this page.
The short answer
- The main sign
- Use keeps going even though it is causing problems and you have tried to cut back.
- How it is diagnosed
- A clinician looks for at least 2 of 11 signs within a 12 month period.
- When to get help
- As soon as you notice the pattern, and right away if there has been an overdose or a close call.
The checklist clinicians use, in everyday words
There is no blood test for opioid use disorder. A clinician diagnoses it by asking about the past 12 months and checking your answers against 11 signs.
Here they are without the textbook wording:
- You take more than you meant to, or for longer than you planned.
- You want to cut down or stop, and your attempts have not held.
- A lot of your time goes on getting opioids, using them, or getting over them.
- You get cravings: a strong pull to use.
- Work, school or home duties are slipping because of use.
- You keep using even though it is causing trouble with people close to you.
- You have dropped or cut back on things you used to care about.
- You use in situations where it is physically risky, such as before driving.
- You keep using even though you know it is making a health or mood problem worse.
- You need more to get the same effect. This is tolerance.
- You feel sick when it wears off, or you use to keep that sickness away. This is withdrawal.
Two or three signs is counted as mild. Four or five is moderate. Six or more is severe.
One note for people on prescribed pain medicine. If you take opioids only as prescribed, under a doctor’s care, tolerance and withdrawal do not count toward the diagnosis. They are expected effects of the medicine. The overview of opiate addiction explains the difference between dependence and addiction.
Changes in behavior that other people tend to notice
Family members usually see the behavior before they see anything physical. None of these proves opioid use. Together, over weeks, they form a pattern.
- Money going missing, unpaid bills, or borrowing with vague reasons.
- Prescriptions running out early, or visits to more than one prescriber.
- Pulling away from family, old friends and things they used to enjoy.
- Missed work, missed school pickups, or plans dropped at the last minute.
- Secrecy about where they have been, and long spells in the bathroom or bedroom.
- Mood that swings between drowsy and calm, then restless and irritable a few hours later.
The lying that often comes with this is hard to live with. Hiding use usually comes from fear and shame, not from a lack of love.
Physical signs of opioid use and withdrawal
Opioids slow the body down. Soon after use, a person may be very drowsy, drift off mid sentence, and have very small pupils. Breathing can become slow.
When the drug wears off, the picture flips. MedlinePlus lists the early signs of withdrawal as anxiety, agitation, muscle aches, a runny nose, watery eyes, sweating, yawning and trouble sleeping. Later come stomach cramps, diarrhea, nausea, vomiting, goosebumps and wide pupils.
So a person who seems to get “the flu” again and again, and then is suddenly fine, may be cycling in and out of withdrawal. Our withdrawal symptoms guide covers this in more detail.
Some signs point to an emergency, not a pattern. If someone cannot be woken, is breathing very slowly or making gurgling sounds, or has blue or gray lips, treat it as an overdose.
Call 911 if someone is not breathing or cannot be woken. Call or text 988 for a crisis or thoughts of suicide. For a free referral at any hour, the SAMHSA National Helpline is 1-800-662-4357.
Signs in yourself that are easy to explain away
From the inside, it rarely feels like a disorder. It feels like a run of reasonable decisions.
You take an extra pill because the pain is bad today. You buy a few from a friend because the refill is a week away.
A few honest checks cut through that:
- You have set yourself a limit and gone past it more than once.
- You plan your day around when you can next take something.
- You feel unwell or panicky when your supply is low.
- You are using to feel normal, not to feel good.
- You are hiding how much you take from people you trust.
If several of those fit, that is useful information, not a verdict on you. It means your brain and body have adapted to the drug, which is what opioids do.
When to seek help, and who to ask
You do not need to meet a set number of signs before you talk to someone. If opioid use is worrying you, that is reason enough.
A primary care doctor, nurse practitioner or telehealth prescriber can do an assessment. It is a conversation, and it is confidential under federal health privacy rules. If you are the one using, ready to stop lays out first steps for this week.
Get help quickly if any of these apply:
- There has been an overdose, or a time someone was very hard to wake.
- Pills or powder are coming from anywhere other than a pharmacy. They may contain fentanyl.
- Opioids are being mixed with alcohol or anxiety medicines such as Xanax or Valium.
- You are pregnant. Do not stop suddenly. Talk to a prescriber first.
If you are worried about someone else, our guide on how to talk to someone about their opiate use can help you start. The treatment directory lists providers in every state.
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Questions people ask us
What are the first signs of opioid addiction?
Early signs are often small: taking more than planned, running out of a prescription early, thinking about the next dose, and feeling unwell or anxious when it wears off. Other people may notice drowsiness, secrecy or money problems. One sign alone means little. A pattern over weeks is worth acting on.
How many signs do you need for a diagnosis?
Clinicians look for at least 2 of the 11 signs within a 12 month period. Two or three is mild, four or five is moderate, and six or more is severe. Only a clinician can diagnose it, but you do not need a diagnosis before you ask for help.
Can someone have opioid use disorder on prescribed pills?
Yes. It can develop with prescribed medicine, especially when it is taken more often or in larger amounts than directed. But tolerance and withdrawal alone do not count for someone taking opioids only as prescribed under medical care. A prescriber can sort out which situation applies.
How can I tell if someone is using opioids or just unwell?
You often cannot be sure from one day. Look for a repeating cycle: very drowsy with small pupils, then hours later restless, sweaty and achy, then fine again. Add changes in money, mood and routine. If the pattern worries you, see our section for families.
Sources
- CDC: Opioid use disorder diagnosis
- CDC: Preventing opioid use disorder
- MedlinePlus: Opioids and opioid use disorder (OUD)
- MedlinePlus: Opiate and opioid withdrawal
- CDC: What to do if you think someone is overdosing
This page is general information, not medical advice. Talk with a clinician about your own situation.