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What Are the Signs of Drug or Alcohol Abuse?

Knowing what to look for is often the difference between catching a problem early and watching it spiral. This guide walks families through the specific, observable signs of substance abuse by behavior, by substance, and by age group, so you can trust what you're seeing and act with confidence.

Clinically Reviewed Content Licensed & Accredited Family-Centered Care

Medical Disclaimer: The content on this page is intended for informational purposes only and does not constitute medical advice. If you or a loved one is experiencing a medical emergency, please call 911. For addiction and mental health crises, reach the SAMHSA National Helpline at 1-800-662-4357 (free, confidential, 24/7) or the 988 Suicide & Crisis Lifeline by dialing 988. All editorial content is reviewed by licensed clinical professionals.

Medically Reviewed by:

Dr. Darrin Mangiacarne
Chief Medical Officer

At Banyan Treatment Centers, Chief Medical Officer Dr. Darrin Mangiacarne leads our nationwide clinical team with over a decade of addiction medicine experience, helping ensure evidence-based, compassionate care across every level of treatment.

Sources

The Sooner You Recognize the Warning Signs, the Better

Problematic substance use rarely announces itself. It may develop gradually and initially look like stress, mood swings, changing sleep patterns, financial pressure, or someone simply acting differently. Over time, however, patterns of drug or alcohol use can interfere with health, responsibilities, relationships, and everyday functioning.

Several factors can influence a person's risk of developing problems with alcohol or other drugs, including genetics, environment, peer pressure, age of first or experimental use, and co-occurring mental health conditions.

It is also important to distinguish occasional substance use from a substance use disorder. Not everyone who uses alcohol or another substance develops a disorder. Clinicians evaluate patterns such as impaired control, intense urges, tolerance, withdrawal, and continued use despite harmful consequences when determining whether someone may have an SUD.

A qualified healthcare or mental health professional can assess symptoms and determine whether a diagnosis or treatment plan is appropriate.

It's also important to understand the distinction between use, abuse, and addiction. Not everyone who uses a substance becomes addicted, but abuse, defined as using a substance in ways that cause harm or impair functioning, is always a warning sign. The line between abuse and addiction is crossed when use becomes compulsive and the person can no longer reliably stop on their own.

The signs below are organized to help you identify what you're seeing, whether you're concerned about alcohol, prescription drugs, or illicit substances.

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Applicable to All Substances

Universal Signs of Drug and Alcohol Abuse

Although different substances can produce different effects, certain behavioral, physical, and emotional changes may occur across many forms of drug abuse, alcohol abuse, and substance use disorder. One sign alone does not necessarily mean a person is using drugs or has an addiction. A combination of persistent changes may provide greater reason for concern.

Behavioral Signs

Increased secrecy about whereabouts and activities or other secretive or suspicious behaviors
Lying, making excuses, or being evasive when asked direct questions
Unexplained need for money, frequent borrowing, or other money or financial problems
Attempts to steal money, valuables, or prescription medications
Neglecting responsibilities at work, school, or home
Abandoning enjoyable activities, hobbies, sports, or interests
Continuing drug use or drinking despite obvious negative consequences
Repeated unsuccessful attempts to cut back or stop
Spending increasing amounts of time obtaining, using, or recovering from substances
Changes in friends, routines, or social activities
Legal trouble, including DUIs, possession charges, or theft
Risk-taking while under the influence, including driving, unsafe situations, or unprotected sex
Using alcohol or drugs under dangerous conditions
Problems in one's relationships related to substance use

Physical Signs

The physical signs of substance use vary according to the drug, dose, frequency, and individual. Possible changes include:

Bloodshot eyes or glazed or watery eyes
Sudden weight loss, unexplained weight gain, or major appetite changes
Deterioration in personal grooming habits or hygiene
Changes in sleep patterns or deterioration in normal routines
Tremors, shaking hands, or unsteady gait
Slurred speech
Impaired coordination or balance
Unusual odors on the breath, clothing, hair, or skin
Frequent sniffling, runny nose, or nosebleeds
Needle marks, track marks, or unexplained bruising
Appearing unusually energetic, restless, or agitated
Appearing tired, sedated, or repeatedly falling asleep
Changes in heart rate or increased blood pressure with certain substances

Physical symptoms can have many causes, including unrelated health problems, so they should be considered alongside behavioral and other changes rather than used alone.

Emotional & Psychological Signs

Substances can affect brain chemistry, mood, judgment, and behavior. Possible psychological or behavioral changes include:

Dramatic mood swings with no apparent cause
Instability, sudden mood swings, or unpredictable emotional reactions
Increased irritability, hostility, or paranoia
Angry outbursts or an unexplained change in temperament
Anxiety or appearing fearful without a clear explanation
Unexplained personality or behavioral changes
Withdrawal from family members and longtime friends
Loss of motivation or interest in future goals
Depression or emotional flatness when a drug wears off
Defensiveness when drug or alcohol use is mentioned
Euphoric highs followed by crashes or extended low periods
Confusion, memory problems, or difficulty concentrating
Unusual increased energy, excessive talking, or restlessness

Substance use can also occur alongside mental disorders such as anxiety or depression. A mental health professional can help determine whether symptoms are related to substance use, a mental health condition, or both.

Substance-Specific Warning Signs

Signs of Drug Abuse by Substance Type

Different substances can produce distinct physical and behavioral effects. If you suspect a specific substance is involved, these signs may help you recognize a pattern. They cannot, however, diagnose a drug addiction or substance use disorder on their own.

Alcohol Abuse

According to the NIAAA, Alcohol Use Disorder affects 28.9 million Americans aged 12 and older. Because alcohol is legal and socially normalized, problematic drinking or binge drinking may be easier for families to rationalize or overlook.

Drinking earlier in the day than usual or drinking alone
Drinking excessive amounts or more than intended
Needing increasing amounts of alcohol to achieve the same effect
Drinking to feel "normal," calm down, or sleep
Becoming defensive or angry when drinking is questioned
Frequent blackouts or gaps in memory
Hiding alcohol or drinking secretly
Repeatedly making and breaking promises to cut back

Smell of alcohol on the breath at unusual times
Flushed face or broken capillaries around the nose
Shaking hands or sweating in the morning
Neglecting meals or relying heavily on alcohol for calories
Deteriorating work performance or relationships
Continuing to drink after experiencing health problems
Experiencing withdrawal symptoms when alcohol use decreases or stops

Opioids — Prescription Painkillers & Heroin

Opioids include prescription medications such as oxycodone, hydrocodone, and morphine, as well as heroin and illicitly manufactured fentanyl. Repeated opioid drug use can lead to tolerance and physical or psychological dependence. The CDC reports that over 80,000 Americans died from opioid overdose in 2021 alone.

As tolerance increases, a person may use more of the drug to experience the same effect. They may also continue using to relieve withdrawal symptoms, reinforcing a cycle of dependence and increasing the risk of serious consequences.

Pinpoint pupils
Nodding off or falling asleep mid-conversation
Slowed breathing and reduced reaction time
Extreme drowsiness or sedation
Slurred speech and confusion
Nausea and constipation

Needle marks or bruising on the arms or legs
Running out of prescription medications early
Seeking prescriptions from multiple providers
Wearing long sleeves to conceal injection marks
Paraphernalia such as syringes, burned spoons, foil, or tubing
Flu-like withdrawal symptoms when not using

Stimulants — Cocaine, Methamphetamine & Prescription Stimulants

Stimulants affect the central nervous system and include cocaine, crack cocaine, methamphetamine, and prescription stimulants such as Adderall and Ritalin when misused. When the stimulant wears off, a person may appear extremely fatigued, depressed, irritable, or withdrawn.

Dilated pupils
Significant weight loss and decreased appetite
Hyperactivity, excessive talking, or unusual increased energy
Elevated body temperature and sweating
Increased blood pressure or rapid heart rate
Frequent nosebleeds, runny nose, or sniffling
Prolonged periods without sleep followed by crashes

Skin picking or sores on the face and body
Severe dental problems associated with chronic methamphetamine use
Paranoia, agitation, or aggressive behavior
Pipes, small mirrors, razor blades, or rolled bills
Erratic or unpredictable behavior
Grandiosity or inflated sense of capability

Benzodiazepines & Depressants — Xanax, Valium, Sleep Aids

Benzodiazepines include medications such as Xanax, Valium, Klonopin, and Ativan. Misusing these medications can lead to tolerance and physical dependence, and abrupt withdrawal after sustained use can sometimes cause severe symptoms. Withdrawal from benzos can be life-threatening without medical supervision.

Because some benzodiazepine withdrawal symptoms can be medically serious, a person who has developed physical dependence should speak with a healthcare professional before abruptly stopping the medication.

Drowsiness or difficulty staying awake
Slurred speech similar to alcohol intoxication
Impaired coordination and balance problems
Memory problems or confusion
Running out of prescribed medication early
Mood swings, particularly between calm and agitation

Seeking multiple prescriptions from different doctors
Taking higher doses than prescribed
Combining with alcohol or other drugs — extremely dangerous
Anxiety or panic between doses (withdrawal)
Insomnia when the medication is reduced
Defensiveness about medication use when questioned

Marijuana & Cannabis Products

Cannabis can also be associated with problematic patterns of substance use. Cannabis Use Disorder is real and affects an estimated 9% of people who use marijuana, rising to 17% for those who start in adolescence (NIDA). The increasing availability of high-potency products has made problematic use more common and more severe.

Red or bloodshot eyes
Distinct odors on clothing, breath, or in a room
Increased appetite or weight gain
Slowed thinking, poor concentration, or memory problems
Exaggerated laughter or inappropriate responses
Changes in motivation or participation in usual activities — lack of motivation or "amotivational syndrome"

Pipes, rolling papers, vaping devices, or edibles
Anxiety or paranoia
Frequent or daily use, or inability to function without using
Using shortly after waking or first thing in the morning
Declining academic or work performance
Withdrawal symptoms — irritability, sleep problems, or appetite changes after stopping frequent use

Age-Specific Patterns

How Signs of Drug and Alcohol Abuse Can Differ by Age

Patterns of drug misuse and alcohol use can look different depending on a person's age, responsibilities, health, and environment. Understanding these differences can help a friend or family member distinguish potential warning signs from ordinary life changes.

Teenagers & Young Adults

Teen substance abuse is particularly serious because the adolescent brain is still developing, making it far more vulnerable to addiction. SAMHSA data shows that most adults with substance use disorders began using before age 18. No single behavior proves a teenager is misusing drugs — persistent patterns and multiple warning signs are more informative.

Sudden drop in grades or school attendance
Pulling away from longtime friends for a new crowd
Unexplained behavioral changes or attitude shifts
Finding drug paraphernalia among their belongings
Smell of alcohol, marijuana, or cigarettes
Excessive secrecy about phones or whereabouts
Missing curfew frequently and making excuses
Becoming unusually hostile when questioned
Giving up sports, hobbies, or other enjoyable activities
Increased risk-taking or dangerous behavior

Working-Age Adults

Adult drug and alcohol abuse can sometimes remain hidden behind work and family responsibilities. High-functioning abuse is common in this group, and often dismissed because the person is "still holding it together."

Declining work performance or frequent absences
Increasing financial problems without a clear explanation
Relationship conflict centered on drug or alcohol use
Using alcohol or drugs to cope with stress, anxiety, or sleep
DUIs or other legal trouble
Physical health deterioration or unexplained weight changes
Isolating from family or social commitments
Neglecting responsibilities while under the influence
Continuing to use despite problems at home or work
Minimizing or joking about their drinking or drug use

Older Adults & Seniors

In older adults, signs of drug misuse or problematic drinking may overlap with symptoms of other health conditions or medication side effects. Substance abuse in older adults is significantly underdiagnosed. The NIAAA estimates that up to 17% of adults over 60 misuse alcohol or prescription medications. A healthcare or mental health professional can help evaluate these symptoms.

Increased confusion or memory problems attributed to "getting older"
Falls or unexplained injuries
Mixing alcohol with prescription medications
Taking more medication than prescribed
Social withdrawal or depression
Neglecting self-care, meals, or personal hygiene
Making repeated excuses for drinking
Changes in sleep or persistent fatigue that worsens over time

Understanding the Spectrum

When Drug or Alcohol Use May Become a Substance Use Disorder

Terms such as drug abuse, alcohol abuse, and addiction are commonly used by families and in online searches. Clinically, healthcare professionals use the diagnosis substance use disorder (SUD) to describe problematic patterns of alcohol or drug use that cause significant impairment or distress.

The Diagnostic and Statistical Manual of Mental Disorders includes criteria clinicians use to evaluate SUD. These include patterns involving impaired control, social problems, risky use, tolerance, and withdrawal.

Substance Use

A person may use alcohol or another substance without meeting the criteria for a substance use disorder. However, experimental use can still carry risks, particularly with illegal drugs, unknown substances, or prescription medications taken outside medical directions. Not all use becomes abuse, but any use of illicit substances or use outside prescribed guidelines is a risk factor.

Example: A person drinks alcohol occasionally without experiencing impairment or other harmful consequences. Or: Having two glasses of wine at dinner on weekends.

Problematic Drug or Alcohol Use

A pattern becomes more concerning when drinking or using drugs begins causing problems with health, relationships, school, work, finances, or safety. Examples may include binge drinking, misusing drugs, neglecting responsibilities, engaging in dangerous activities while under the influence, or continuing to use despite negative consequences. Abuse is a clear warning sign that the relationship with the substance is becoming problematic.

Example: Drinking heavily every night to cope with stress, despite worsening relationships and missed work.

Substance Use Disorder

A substance use disorder can range from mild to severe depending on the number of diagnostic criteria present. Someone may experience strong cravings or intense urges, increased tolerance, withdrawal symptoms, difficulty controlling use, or continue using drugs despite significant consequences. Over time, repeated exposure to certain substances can affect brain chemistry and behavior, making it difficult to reliably stop without support.

Example: Drinking from the moment of waking, having experienced withdrawal, losing their job, and being unable to stop despite wanting to.

Taking Action

I'm Seeing Signs of Drug and Alcohol Abuse: What Do I Do Next?

Recognizing possible signs of drug and alcohol abuse is the first step. Here's what you can do with that knowledge.

Document What You're Seeing

Keep a private record of specific incidents, dates, behaviors, and what was said. Note patterns such as mood swings, unexplained financial problems, changes in physical appearance, missed responsibilities, or suspicious behaviors. This helps you distinguish a pattern from isolated events and gives you concrete examples when speaking with your loved one or a professional.

Don't Confront Them While Intoxicated

Conversations about substance use are unlikely to be productive while someone is impaired. Choose a calm, sober moment and approach from love and concern, not accusation. Use specific observations — "I've noticed you've been coming home late and seem different" — rather than generalizations.

Focus on Patterns, Not One Sign

A single symptom such as bloodshot eyes, weight loss, increased irritability, or changes in sleep does not prove someone has a drug addiction. Look for multiple, persistent changes and the effect those changes are having on daily life. If something feels wrong, trust your instincts — you know your loved one.

Learn About Addiction

Understanding what you're dealing with changes how you respond. Review our full guide on recognizing addiction and the clinical criteria that define it — it will help you respond with both clarity and compassion.

Consider Professional Support

If conversations have not helped or you are unsure what to do next, a healthcare provider, addiction specialist, or mental health professional can help assess the situation. Depending on the person's needs, a treatment plan may include medical care, therapy, support groups, family involvement, or structured substance use disorder treatment. For situations where previous attempts have failed, a professional interventionist can guide your family through a structured, compassionate conversation.

Call Banyan's Admissions Team

Our team is available 24/7 to help families understand treatment options for drug addiction, alcohol addiction, and substance use disorders. You do not need to have all the answers before calling. We can help you understand potential next steps based on your loved one's situation.

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Related Guides for Families

Now that you know the signs, these guides will help you understand what comes next.

Recognizing Addiction

Understand the clinical difference between abuse and addiction, the 11 DSM-5 criteria, and what to do when your loved one is in denial.

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Withdrawal & Detox

What happens when someone stops using, why some substances make withdrawal medically dangerous, and what medical detox actually provides.

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Understanding Treatment Options

A guide to the continuum of care — detox, residential, PHP, IOP, and virtual IOP — and how to choose the right level for your loved one.

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Substances & Their Effects

A deeper look at specific substances — opioids, alcohol, meth, fentanyl, and prescription drugs — their effects on the brain and body, and what families need to know.

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Relapse & Recovery

Understanding relapse as part of the recovery process, what to do when it happens, how to support without enabling, and what long-term recovery actually looks like.

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Paying for Treatment

Insurance coverage, Medicaid, Medicare, and low-cost options — what families actually have access to and how to navigate the cost of getting help.

Read the guide →

Medical Disclaimer: This content is for informational purposes only and does not constitute medical advice or diagnosis. For professional evaluation, contact a licensed healthcare provider. If your loved one is in crisis, call or text 988 or call 911.

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