Substance Use Disorder: Symptoms, Causes & Treatment

Substance Use Disorder (SUD) is a mental disorder marked by compulsive use of a substance despite its harmful effects. Individuals with SUD experience an intense preoccupation with the use of alcohol, tobacco, and other psychoactive substances, impairing their ability to function in daily life.

The repeated use of these substances eventually affects brain functioning, making it difficult to stop even when the consequences are highly debilitating. Upon removal of the drug, withdrawal symptoms such as anxiety, irritability, and cravings can develop, making it challenging to quit without help.

Here are 5 Common forms of SUD:

• Alcohol Use Disorder
• Opioid Use Disorder
• Cannabis Use Disorder
• Cocaine Use Disorder
• Tobacco Use Disorder

Substances are a class of chemical compounds capable of modifying normal brain functions and altering mental or physical health. The most commonly misused substances include the following:

A widely used legal psychotropic substance that may cause dependence and addiction.

Painkillers that are prescribed – herein referred to as oxycodone – and illegal drugs like heroin.

These include drugs such as cocaine, methamphetamine, and some prescription medications, like most ADHD drugs.

As much as it might be legal in some states, its use may lead to abuses and dependence.

A legally available drug that contains nicotine, the most addictive drug.

These are drugs such as LSD and ecstasy, which distort perception and alter mood.

The difference between substance use/misuse and a substance use disorder is based on the severity, frequency, and impact of the taken substance.

This refers to the use of a substance that may or may not cause harm. For example, having a drink occasionally without negative effects is considered substance use.

This involves the use of a substance in a way that is harmful to oneself or others. Misuse is less severe than addiction but strong enough to meet some diagnostic criteria for Substance Use Disorder (SUD). It is associated with significant harm and can lead to SUD over time.

SUD is a diagnosable medical condition wherein a person meets at least two of the criteria from DSM-5, such as, “Taking the substance in larger amounts or over a longer period than was intended” or “A persistent desire or unsuccessful efforts to cut down or control substance use despite a wish to do so.” SUD is more serious than misuse in that it very often requires professional treatment and intervention.

Substance Use Disorder (SUD) and addiction are commonly used interchangeably, but they do not refer to the same issue. SUD is a medical diagnosis that represents a continuum of problematic substance use, ranging from mild to severe. In contrast, addiction refers to the most extreme form of SUD, where an individual has lost control over their substance use and continues despite harmful consequences.

While SUD is the broad category encompassing addiction, addiction itself does not cover all cases of SUD. In other words, SUD can be viewed as a spectrum of severity, with addiction representing a more advanced and entrenched level of the disorder that can be particularly debilitating.

Substance Use Disorder (SUD) can affect anyone, regardless of age, gender, or socioeconomic status. SUD can be diagnosed among teenagers, adults, and even elderly individuals.

In most cases, factors such as genetics, environment, mental health, and trauma play a significant role in the diagnosis of SUD. Some individuals may be more predisposed to the disorder, particularly those with family histories related to addiction, which can contribute to higher levels of stress or trauma.

Substance Use Disorders (SUD) are a prevalent concern in the United States. According to the Centers for Disease Control and Prevention (CDC), in 2020, an estimated 40.3 million people aged 12 years and older reported having SUD in the past year, accounting for about 14% of that age group.

The most common form of Substance Use Disorder (SUD) is Alcohol Use Disorder. Alcohol misuse is a significant problem affecting millions of people in America and can lead to various substantial health and social issues. Although alcohol is a legal drug, its overuse can result in serious consequences, ranging from liver disease to impaired judgment and damaged relationships.

Substance Use Disorder (SUD) affects behavior, physical health, and social well-being. Recognizing the signs and symptoms early can be crucial in seeking help.

• Feeling a strong urge or craving to use the substance, often leading to regular use—sometimes daily or multiple times a day.
• Difficulty in cutting down or controlling substance use, even when the person wants to stop.
• Needing more of the substance to feel its effects over time.
• Failure to fulfill important responsibilities at work, school, or home due to substance use.
• Engaging in dangerous activities while under the influence, such as operating machinery or driving.

• Poor hygiene
• Red eyes
• Weight loss
• Irritability
• Anxiety
• Aggressive behavior or eagerness to fight
• Nausea or vomiting
• Confusion
• Dizziness
• Tremors
• Irregular heartbeats

• Withdrawing from family, friends, and activities once enjoyed.
• Continuing to use Substances despite continuing problems in personal or work relationships.

Substance use disorder (SUD) is a condition that develops over time based on multiple factors:

Repeated use of drugs or alcohol alters brain chemistry, leading a person to lose the capacity to enjoy almost everything in life except that particular substance. As this process continues, the brain begins to depend on the substance to trigger its reward system, resulting in cravings and, eventually, dependence.

Studies have shown that a family history of substance use disorders can increase vulnerability due to inherited characteristics that influence how substances affect the brain.

Conditions such as anxiety, depression, and trauma can lead individuals to use substances as a coping mechanism, thereby increasing their vulnerability to SUD.

Easy access to drugs or alcohol and being in an environment that promotes substance use are significant risk factors.

Trauma during childhood, such as neglect or abuse, can cause emotional pain, leading individuals to numb their feelings with substances.

There is no single test for diagnosing Substance Use Disorder (SUD). Healthcare providers diagnose the condition through a comprehensive assessment that includes medical history, substance use behavior, and psychological evaluation. Common diagnostic signs may include:

• Neglect of personal hygiene
• Red eyes
• Symptoms of depression, anxiety, or sleep disturbance
• Weight loss
• Chronic Fatigue
• Abnormalities in laboratory results
• Changes in heart rate or blood pressure

Medical professionals can assess the severity of substance use using various screening tools and questionnaires. Additionally, drug and alcohol tests can indicate the type and amount of substances present in an individual’s system. Diagnosis may be conducted by a family doctor, psychiatrist, or mental health professional.

Treatment for Substance Use Disorder (SUD) is individualized and typically involves a multifaceted approach to ensure long-term recovery:

Cognitive Behavioral Treatment (CBT): CBT helps individuals recognize and alter the thought patterns and behaviors that lead to substance use. It is effective in managing triggers and developing healthier coping strategies.

Dialectical Behavior Therapy (DBT): DBT focuses on mindfulness and acceptance, equipping individuals with skills to regulate extreme emotions, reduce self-destructive behaviors, and enhance relationships.

Contingency Management (CM): CM reinforces abstinence by offering rewards for positive behaviors, such as attending therapy sessions or remaining sober.

Detoxification involves discontinuing substance use to rid the body of the substance. This process can be physically and emotionally challenging and is often conducted under medical supervision to manage withdrawal symptoms.

Medications are often used to manage cravings or withdrawal symptoms. FDA-approved medications include methadone and naltrexone for opioid addiction, as well as naltrexone and acamprosate for alcohol dependence.

Sober living houses provide a supportive environment with structured spaces tailored to the needs of individuals recovering from SUD. These homes offer daily schedules, peer support, and a substance-free living environment to promote long-term sobriety. 

You can learn more about how sober living can be used to treat substance use disorder and support long-term recovery.

Recovery is a continuous process, and the best outcomes are usually achieved through a combination of therapy, medical interventions, and ongoing community support.

SUD develops gradually and can be hard to recognize from the inside. A few signs that something more than occasional use may be happening:

• Cutting back has felt genuinely difficult, even when you wanted to
• Use has increased over time without a conscious decision to do so
• Substances have become a way of managing emotions or getting through the day
• Relationships, work, or health have started to show the effects
• The idea of stopping brings up significant fear or discomfort

One of the most important things to understand about SUD is that it changes the brain. This is not a metaphor. Repeated substance use physically alters how the reward system works, making it genuinely harder to feel good without the substance and genuinely harder to stop.

On top of that, the environment someone lives in, the people they spend time with, and the daily situations they navigate all quietly reinforce the pattern. That is a big part of why staying consistent feels harder than it should, even for people who are deeply motivated to change.

Some situations go beyond what personal effort alone can address:

• Withdrawal symptoms appear when use is reduced or stopped
• Previous attempts to quit have not held
• Mental health challenges like anxiety or depression are closely tied to the substance use
• Daily life, including relationships, work, and basic self-care, has become hard to maintain
• Substance use is happening alongside other substances, increasing the risk of overdose

Effective support for SUD tends to address the physical, emotional, and environmental sides at the same time:

• Therapy that gets to the root of what has been driving use, not just the use itself
• Medical support during detox and early recovery to manage withdrawal safely
• A stable, substance-free living environment that provides daily structure and accountability
• Community with others who understand the experience firsthand
• Ongoing support that does not disappear after a formal program ends

It is also worth thinking about whether recovering in your current environment or stepping into a new one gives you the best chance of lasting change. For many women, the familiar setting is one of the biggest factors in whether recovery holds over time.

Supporting a loved one with Substance Use Disorder (SUD) requires empathy, patience, and education about the issue. Here are 6 meaningful ways to provide support:

• Educate Yourself: Learn about SUD to better understand what your loved one is experiencing and how you can effectively support them.
• Encourage Honest Conversations: Foster a safe, non-judgmental space for open discussions about their struggles, allowing them to express their feelings without fear of criticism.
• Assist in Seeking Treatment: Offer to help your loved one find treatment options, such as rehab facilities, therapists, or support groups. Sometimes, a gentle nudge can motivate them to take the first step toward recovery.
• Provide Emotional Support: Be there for your loved one while avoiding enabling behaviors that may unintentionally support their substance use.
• Create a Safe Environment: Offer a substance-free space that encourages healthy lifestyle choices and emotional well-being.
• Set Boundaries: It’s essential to establish boundaries for yourself to ensure your own mental and emotional needs are met while supporting your loved one.

Preventing Substance Use Disorder (SUD) can be challenging due to its causes, which range from genetic predispositions to environmental circumstances and direct exposure to substance use. While not all cases of SUD can be prevented, certain strategies may help lower the risk:

• Encourage awareness in families, schools, and communities to decrease first-time use.
• Take prescription medications as directed, and never more than the prescribed dose.
• Exercise, hobbies, and mindfulness during times of stress are helpful.
• Contact a mental health professional if stress or emotional problems arise.
• Store drugs safely. Use take-back programs offered for disposal.

Though these steps cannot guarantee complete prevention, they can significantly minimize the risk of developing SUD.

If You're Thinking About This for Yourself

You might be reading this because something in your own life has started to feel like it fits what is described here. That recognition is worth taking seriously.

If You're Supporting Someone

Helping a loved one with SUD while taking care of yourself is one of the harder balancing acts there is. Knowing what you are dealing with, and having realistic expectations about what help looks like, makes a real difference. You do not have to figure it out alone either.

For women in Southern California exploring what that looks like, women's sober living in Los Angeles offers a structured, community-based environment designed around exactly this kind of recovery.

Recovery from substance use disorder is possible, and it does not have to happen alone.

Bridges Sober Apartments provides a safe, structured sober living environment for women in recovery. Residents build real community, develop practical life skills, and move toward a stable, substance-free life with the support of people who genuinely understand what the process involves.

No matter where you are starting from or how long things have been difficult, there is a path forward.