Signs and Symptoms of Substance Use Disorder

If you are reading this, something has probably felt “off” for a while. Maybe you are worried about your own substance use. Maybe you are watching someone you love change in ways you cannot explain. Either way, it can feel heavy to name what you see.

This guide will help clarify matters without judgment. Substance use disorder (SUD) is a medical condition, not a moral failure. Addiction is a disease, not a character flaw, and overcoming it often requires support. Noticing signs of substance use disorder is not about blame. It is about honesty, safety and knowing how to take the right steps towards recovery

Talk with Beauterre today
If you want help with alcohol or drug dependence, Beauterre’s team can guide you through the next steps. Call 612-454-2444 or contact us online for a confidential consultation.

How Clinicians Identify SUDs

Clinicians do not diagnose substance use disorders in a single moment. They look for a cluster of symptoms that tend to fall into a few core areas:

  • Loss of control: using more than planned, trying to cut back and finding it hard
  • Preoccupation and cravings: spending a lot of time thinking about, getting, using, or recovering
  • Life impact: relationships, responsibilities, or goals start to suffer
  • Risk: using in unsafe situations, mixing substances, continuing despite harm
  • Body-based symptoms: tolerance and withdrawal for some substances

The American Psychiatric Association provides patient-friendly information explaining how substance use disorders are understood across different substances. If several areas in this guide feel familiar, it is worth getting a professional assessment. You do not need to wait for conditions to worsen to seek help.

You can also take Beauterre’s free and confidential online assessment if you are concerned about your relationship to substances. 

Common Signs and Symptoms of Substance Use Disorder

Behavioral signs

Drug use can lead to significant problems in many areas of life, yet people with substance use disorders often fail to see or deny they have a problem.

These patterns show up across many substances:

  • Using more than intended or for longer than planned
  • “Budgeting” time or money. “I’m only taking $20 to the bar tonight,” or “I’m leaving the party by 10pm,” but not following through
  • Making repeated attempts to cut back, then returning to use
  • Spending a lot of time getting, using, or recovering
  • Missing work, school, or family responsibilities (neglect of responsibilities), which includes a decline in performance at work or school, frequent absences, or failing to meet family obligations
  • Lying to friends or family about substance use
  • Social isolation, such as withdrawing from long-time friends and family or shifting to a new social circle that uses substances
  • Losing interest in activities that used to matter
  • Continuing to use after conflict, broken trust, or consequences
  • Taking risks such as driving impaired or using in unsafe places
  • Building life around access and feeling panic when the supply runs out
  • Needing more of the substance over time to get the same effect

Signs and symptoms of substance use disorder vary widely from person to person and depend on the substance, length and severity of use, and an individual’s personality.

Physical signs

Physical symptoms of SUDS vary based on the substance, amount, and frequency. Still, common signals include:

  • Drastic changes in sleep, including insomnia or sleeping far more than usual
  • Appetite changes and significant weight shifts
  • Physical health signs such as bloodshot or glassy eyes, pupils that are abnormally large or small, and tremors or impaired coordination
  • Fatigue, frequent illness, unexplained bruises, or accidents
  • Declining hygiene or appearance that feels out of character
  • Signs of withdrawal when not using, such as sweating, nausea, agitation, shaking, or restlessness. 

Physical changes can occur with repeated drug and/or alcohol  use, including alterations to brain neurons and neurotransmitter communication, which may lead to physical addiction and long-lasting neural modifications.

Cognitive issues may also be present, including difficulties with concentration, memory lapses, or slowed reaction times.

If someone is experiencing withdrawal, medical guidance is important. Withdrawal can be dangerous with alcohol and certain sedatives. If you are concerned about withdrawal symptoms, Cal Beauterre at 612-454-2444 or contact us online to learn more about our inpatient and medication-assisted treatments for detoxification. 

Psychological and emotional signs

SUDs often affect emotional regulation and mental health. Common signs include:

  • Intense cravings or intrusive thoughts about using, which can result from changes in a person’s brain chemistry and function due to substance use
  • Mood instability, such as sudden mood swings, increased irritability, angry outbursts, or uncharacteristic aggression
  • Feeling unable to relax, sleep, or cope without a substance
  • Anxiety, depression symptoms, irritability, or emotional numbness
  • Shame, hopelessness, or feeling “stuck.”
  • Cognitive issues, including difficulty focusing, memory lapses, or slowed reaction times
  • Increased conflict, distrust, or emotional distance in relationships
  • Using it as a coping strategy for trauma, stress, loneliness, or chronic pain

SUD is also frequently connected with co-occurring mental health concerns. Symptoms can overlap, which is one reason a full assessment can be so helpful. Consulting a mental health professional is important for proper assessment and support.


If signs are adding up, reach out early
You do not need a crisis to ask for support. Take Beauterre’s free and confidential self-assessment or call 612-454-2444 to talk through options.

Substance-Specific Patterns

Not everyone dealing with a substance use disorder has the same signs or consequences. While many behavioral symptoms overlap, different substances interact with the brain and body in unique ways:

  • Illicit or “Street” Drugs: Secretive behavior, sudden financial strain, and risky behaviors to obtain the substance. The presence of drug paraphernalia and a total shift in social circles are often the first outward signs of a burgeoning disorder.
  • Alcohol: Drinking more than planned, needing more to feel the same effects, experiencing blackouts, or drinking early in the day to “steady” the nerves. Common signs include irritability when not drinking and frequently needing to apologize for behavior while intoxicated.
  • Opioids: Using medication in ways other than prescribed, severe drowsiness (“nodding off”), pinpoint pupils, and chronic constipation. Withdrawal often feels like a life-threatening case of the flu, including bone aches and severe restlessness.
  • Stimulants (Cocaine, Meth, ADHD medications): Beyond the initial “rush,” signs include intense periods of wakefulness followed by days of exhaustion, rapid speech, paranoia, and significant weight loss. Long-term use often manifests as severe dental issues, skin picking, or sudden aggressive outbursts.
  • Sedatives and Benzodiazepines: Extreme lethargy, slurred speech, and impaired coordination similar to alcohol. These carry a high risk of life-threatening withdrawal symptoms and dangerous interactions when mixed with other substances.
  • Cannabis: High-frequency use that interferes with daily goals, chronic “brain fog,” or a noticeable decline in motivation (amotivational syndrome). Some individuals experience increased anxiety or “scromiting” (cannabinoid hyperemesis syndrome), and find they are unable to stop despite negative impacts on their career or relationships.

Severe Signs That Require Immediate Action

Some signs call for urgent support. Take action right away if you notice:

  • Using before driving, operating machinery, or caring for children
  • Mixing substances, especially opioids with alcohol or sedatives
  • Severe withdrawal symptoms
  • Fainting, seizures, severe confusion, or hallucinations
  • Suicidal thoughts or self-harm risk
  • Signs of overdose like passing out cold or breathing problems

Ovedrosing is often fatal. Unresponsiveness, slowed or stopped breathing, blue or purple lips or nails, and gurgling or snoring sounds can be a matter of life and death. Call emergency services immediately and use naloxone on the impacted person if available.

Are you concerned about safety?
If there is any immediate danger, call 911. If it is not an emergency but you are worried about withdrawal risk or the next step, call Beauterre at 612-454-2444 or schedule a confidential consultation.

How to Talk to Someone You Care About Regarding Substance Use

Often, friends or family are the first people to notice signs of substance use disorder, but having conversations can be challenging. The impacted person can get defensive, sometimes they lash out or threaten to cut off their loved ones if they continue to criticise their substance use. Difficult conversations are more productive when all participants feel safe and supported. To foster a constructive environment, consider this approach:

  1. Pick a calm time. Avoid bringing it up during intoxication or active conflict.
  2. Lead with care. “I care about you, and I’m worried.”
  3. Stay specific. Mention what you noticed and how it has affected daily life.
  4. Avoid labels. Focus on behavior and safety, not character.
  5. Offer support. “We can call someone together.” “I can sit with you during an intake call.”
  6. Set boundaries with compassion. Boundaries protect both of you and can reduce harm.

What Help For SUDs Can Look Like

Getting help for addiction often starts with a confidential conversation. This is an opportunity to understand the risks, needs, and the appropriate level of care. Seeking appropriate treatment is essential, and developing a personalized treatment plan with a licensed alcohol and drug counselor or other qualified professional can greatly improve outcomes. Support may include:

Treatment can be calm, respectful, and effective. The goal is not just to stop use. The goal is rebuilding health, safety, and connection. Long-term recovery often requires ongoing support, continued care, and overcoming stigma to maintain lasting sobriety.

Are you ready to talk to someone? Call Beauterre at 612-454-2444 or schedule a confidential consultation.

A Quick Self-Check

Ask yourself:

  • Have I used more than I planned, even after promising I would not?
  • Have I tried to cut back and found it harder than expected?
  • Has my use affected my mood, sleep, relationships, or work?
  • Do I spend a lot of time thinking about using or recovering from it?
  • Do I feel unwell, anxious, or shaky when I stop?
  • Have I taken risks while using?
  • Do I keep using even after consequences?

If you have experienced the signs and symptoms in this guide, it may be time to consult a professional. A confidential conversation can bring clarity and relief, even before you decide what to do next. You may also use our self-assessment tool to explore your symptoms in greater detail.

Take the Next Step with Beauterre

You don’t have to carry the burden of substance use disorder alone. If you recognize signs of substance use disorder in yourself or a loved one, please know that professional support is ready when you are. You are allowed to seek help early (even if you don’t have all the answers yet), and you are allowed to envision a different, happier future for yourself.

At Beauterre, we understand that substance use impacts the whole family. That’s why we offer a full continuum of care, including detoxification, residential treatment, IOP, an integrated dual-diagnosis program, relapse prevention, and ongoing aftercare. Our caring team is here to help you navigate the path forward. Choose the option that feels most comfortable for you:

Looking for help? Contact us or call today.

612-454-2444

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