What Is Substance Use Disorder? A Comprehensive Guide

Published on: April 17, 2023
Updated on: April 17, 2025
Author: Kentucky Counseling Center

Substance use disorder (SUD) is a condition characterized by an uncontrolled use of any substance, often referred to as “substance addiction.” Individuals with SUD continue using a substance despite harmful consequences to themselves, including negative impacts on their daily activities, personal relationships, and overall health. Over time, continued substance use can lead to significant changes in the brain—resulting in increased cravings, altered behavior and personality, and a decreased ability to function without the substance.

According to the Substance Abuse and Mental Health Services Administration (SAMHSA), millions of Americans struggle with some form of substance use disorder each year. Fortunately, many evidence-based treatment options are available, and with the right support system, individuals can work toward recovery and regain control of their lives.

Understanding Substance Use Disorder

People with addictive disorders may experience changes in thinking, mood, and behavior. As substance use escalates:

• Tolerance develops, requiring larger doses for the same effect.
• Dependency can form, making daily life difficult without the substance.
• Self-control may wane, and chronic health issues often arise.

Ultimately, a person with SUD may reach a point where they cannot function normally without the substance.

Types of Substance Use Disorders

Substances commonly misused include both legal and illicit drugs, as well as certain prescription medications. Below are the most frequently encountered substance categories.

1. Tobacco

• Prevalence: Tobacco is one of the most commonly abused substances in the United States, with over 40 million smokers recorded.
• Active Ingredient: Nicotine, which can make tobacco highly addictive.
• Perceived Benefits: Users often believe it helps them relax or manage stress.
• Long-Term Risks: Chronic use can lead to organ damage—particularly of the lungs—and various other health problems.

2. Alcohol

• Prevalence: Alcohol is the second most commonly used and misused substance in the U.S.
• Nature: A psychoactive depressant that slows down brain activity.
• Effects: Minimal intake can reduce anxiety, but heavy use impairs motor functions and decision-making.
• Short-Term Impact: Effects can last up to two days, affecting work or school performance.
• Long-Term Risks: Chronic misuse may result in brain and liver damage.

3. Cannabis

• Description: A naturally occurring plant that can induce euphoric or relaxing effects.
• Forms: Typically smoked, vaporized, or ingested through edibles.
• Active Ingredient: THC (tetrahydrocannabinol).
• Potential Effects: Euphoria, relaxation, and in some cases, hallucinations or increased anxiety.
• Long-Term Risks: Heightened risk of psychosis, paranoia, difficulty concentrating, and loss of motivation.
• Medical Context: For those considering medical cannabis as a treatment option, consulting certified medical marijuana doctors can provide guidance on safe and legal use.

4. Opioids

• Primary Use: Pain relief and euphoria induction.
• Examples: Opium, heroin, and prescription opioids like codeine, oxycodone, and morphine.
• Misuse: Often taken in quantities beyond prescribed doses.
• Risks: High potential for overdose and physical dependence with regular use.

5. Benzodiazepines

• Purpose: Often prescribed as tranquilizers or sedatives to treat anxiety and insomnia.
• Common Types: Alprazolam (Xanax), diazepam (Valium), lorazepam (Ativan), among others.
• Effects: Induce relaxation, calmness, and sleep.
• Dependency Risk: Many become reliant on benzodiazepines for sleep, leading to misuse and addiction.

6. Stimulants

• Nature: Increase alertness and energy.
• Common Types: Cocaine, amphetamines, speed, crystal meth.
• Short-Term Effects: Can cause agitation, hyperactivity, and sometimes psychotic symptoms.
• Long-Term Risks: Potential for severe mental illness with prolonged misuse.

What Causes Substance Use Disorders?

The exact cause of SUD is not fully understood, but several risk factors increase susceptibility:

1. Environmental Factors
   • Peer pressure, chronic stress, or cultural norms that normalize substance use.
2. Genetic Factors
   • Family history of addiction can predispose individuals to SUD.
3. Mental Health Conditions
   • Anxiety, depression, and PTSD often co-occur with SUD as individuals try to cope with emotional distress.
4. Increased Tolerance
   • Regular use of a substance can escalate into SUD as tolerance builds.

According to the World Health Organization (WHO), individuals often turn to substances:

• To experience happiness or euphoria
• To feel calm or relieve stress
• To cope with chronic pain
• As a result of peer pressure
• To bolster self-confidence in social settings
• To numb anger or other strong emotions

How Is Substance Use Disorder Diagnosed?

Diagnosing SUD typically involves:

• Laboratory Testing: Screening for substance presence.
• Clinical Evaluation: Assessment by a psychiatrist, psychologist, or other trained professional.

The DSM-5 (Diagnostic and Statistical Manual of Mental Disorders, 5th Edition) outlines 11 criteria for diagnosing SUD. The severity (mild, moderate, or severe) is determined by how many of these criteria are met, including:

1. Taking the substance in larger amounts or for a longer duration than prescribed.
2. Wanting to cut down but being unable to do so.
3. Spending excessive time obtaining, using, or recovering from the substance.
4. Experiencing cravings or urges to use.
5. Neglecting major responsibilities at school, work, or home.
6. Continuing use despite relationship problems caused by the substance.
7. Abandoning important social, occupational, or recreational activities.
8. Repeated use despite dangerous situations.
9. Continued use despite known mental or physical health risks.
10. Developing tolerance, requiring more of the substance to achieve the same effect.
11. Withdrawal symptoms when not using the substance.

Related: Worried About Your Diagnosis? You’re Not Alone

How Is Substance Use Disorder Managed?

A variety of treatment methods can effectively manage or treat substance use disorder. Individualized treatment plans, addressing both mental and medical health, often yield the best results. Common management strategies include:

• Medications to manage withdrawal symptoms, reduce cravings, or treat co-occurring conditions
• Behavioral Counseling (e.g., cognitive-behavioral therapy, motivational interviewing)
• Supportive Medical Devices for easing withdrawal symptoms
• Dual Diagnosis Treatment to address any underlying mental health conditions
• Rehabilitation Programs (inpatient or outpatient)
• Group Therapy Sessions or 12-step programs for peer support
• Continued Follow-Up to monitor progress and prevent relapses

How Therapy Can Help With Substance Use Disorder

Therapy plays a crucial role in the recovery process for individuals with substance use disorder. It offers:

• A safe, judgment-free space to address emotional distress
• Techniques to improve coping skills, self-esteem, and relationship dynamics
• Relapse prevention strategies through ongoing support and accountability

At Kentucky Counseling Center (KCC), we provide customized therapy or counseling to address the emotional and psychological toll that SUD often creates. Our compassionate counselors are available online and ready to support you in your journey toward recovery. If you or a loved one is grappling with SUD, remember that you don’t have to face it alone—help is just a call or chat away.