What Is Therapy? Definition, Types, Timelines

Therapy — also called psychotherapy or talk therapy — is a structured, evidence-based clinical treatment in which a licensed mental health professional helps individuals identify and change troubling emotions, thoughts, and behaviors. In 2024, 23.4% of U.S. adults — 61.5 million people — experienced a mental illness, yet more than half of adults with a mental illness still receive no treatment. (NAMI, 2025) For the 1 in 15 U.S. adults living with both a substance use disorder and a mental illness, closing that gap through integrated therapy is not optional — it is clinically urgent. (NAMI, 2025)

Key Takeaways

• Mental illness is common: More than 1 in 5 U.S. adults experiences mental illness each year; young adults aged 18–25 are the highest-risk group at 32.2%. (NAMI, 2025)
• Treatment works: Evidence-based therapies — including CBT, DBT, and EMDR — have been shown by research to reduce symptoms of depression, anxiety, PTSD, and addiction. (NIMH)
• Large treatment gap: Only 49.9% of U.S. young adults aged 18–25 with a mental illness received treatment in 2024. (NAMI / SAMHSA, 2025)
• Addiction and therapy: Behavioral therapies — including CBT and contingency management — are the primary treatment for substance use disorders involving stimulants and cannabis, where no FDA-approved medications yet exist. (NIDA)
• Co-occurring disorders: Integrated therapy for co-occurring mental illness and SUD produces reduced substance use, improved psychiatric functioning, decreased hospitalization, and better quality of life compared to non-integrated approaches. (SAMHSA)
• Economic return: Every dollar invested in addiction treatment yields $4 to $7 in reduced crime, healthcare, and societal costs. (NIDA)
• Whole-person treatment: Stopping substance use is one part of recovery — therapy addresses the medical, mental, social, family, and occupational needs that sustain long-term change. (NIDA)

What Is Therapy?

Therapy (psychotherapy) is a clinical process in which a person works with a licensed mental health professional to understand and change the emotions, thoughts, and behaviors that cause distress or impair functioning. The goals of psychotherapy are to relieve symptoms, maintain or improve daily functioning, and enhance quality of life. (NIMH) Psychotherapy and medication are the two most common forms of mental health treatment, and they are often used together.

Therapy addresses a wide range of conditions — from depression and anxiety to trauma, addiction, and personality disorders. Treatment plans are individualized: the therapist’s approach depends on their training, the condition being treated, and the patient’s specific needs. According to NIMH, there is no formal FDA approval process for psychotherapies as there is for medications — but for many modalities, large-scale clinical research has provided strong evidence of effectiveness. (NIMH)

Therapy can be delivered one-on-one, in groups, or with families, and in settings ranging from inpatient hospitals and residential programs to outpatient clinics and telehealth platforms. SAMHSA recognizes individual counseling, group counseling, family therapy, motivational therapy, CBT, and art therapy among the most commonly used approaches. (SAMHSA)

Who Needs Therapy?

Therapy is appropriate for anyone experiencing persistent distress, impaired functioning, or behavioral patterns that cause harm — regardless of whether a formal diagnosis has been made. Common reasons people seek therapy include:

• Severe or ongoing stress from work, family, or relationship problems
• Symptoms of depression, anxiety, PTSD, or other mental health conditions
• Substance use or behavioral addiction that affects daily life
• Trauma history, including adverse childhood experiences
• Co-occurring mental health and substance use disorders
• Suicidal thoughts, self-harm, or emotional dysregulation
• Difficulty coping with a major life transition, grief, or loss

In 2022, 55.8 million Americans received counseling or mental health treatment — yet more than half of adults with a mental illness still received no care at all. (NAMI / SAMHSA, 2025) Serious mental illness causes $193.2 billion in lost earnings annually across the U.S. economy — underscoring that untreated mental health conditions carry real, measurable costs beyond personal suffering. (NAMI)

Types of Therapy

Different types of therapy are matched to different conditions and patient needs. The most widely used, evidence-based modalities are described below.

Therapy Type	Core Approach	Primary Uses
CBT	Identifies and restructures harmful thought patterns and behaviors	Depression, anxiety, addiction, PTSD, OCD
DBT	Builds emotional regulation, distress tolerance, and interpersonal skills	Borderline personality disorder, self-harm, suicidality, eating disorders
EMDR	Processes traumatic memories through guided bilateral stimulation	PTSD, trauma, anxiety
Motivational Enhancement Therapy (MET)	Activates readiness to change by resolving ambivalence about behavior	Substance use disorders, early-stage addiction
Contingency Management	Uses positive reinforcement (rewards) for drug-free behavior and attendance	Stimulant, cannabis, and opioid use disorders
12-Step Facilitation (TSF)	Prepares individuals for engagement in 12-step mutual support programs	Alcohol and drug use disorders
Family Therapy	Involves family members to address relational dynamics that influence recovery	Adolescent substance use, addiction affecting family systems
Group Therapy	Peer-supported sessions facilitated by a licensed professional	Addiction, depression, trauma, social skills development

Cognitive Behavioral Therapy (CBT)

CBT is the most extensively researched form of psychotherapy. It works by helping patients become aware of automatic harmful thought patterns, understand how those thoughts drive emotions and behavior, and replace self-defeating patterns with healthier responses. (NIMH) For addiction specifically, CBT teaches patients to recognize, avoid, and cope with the situations, moods, and social cues that are most likely to trigger drug or alcohol use. (NIDA) CBT also underpins exposure therapy for anxiety — in which a patient is gradually exposed to feared stimuli until the fear response diminishes.

Dialectical Behavior Therapy (DBT)

DBT was developed to treat borderline personality disorder and is now used across a range of conditions marked by emotional dysregulation and self-destructive behavior. Clinical trials supported by NIMH confirm that DBT reduces suicidal behavior and self-harm in both adults and adolescents. (NIMH) DBT combines individual therapy with skills training in four areas: mindfulness, distress tolerance, emotion regulation, and interpersonal effectiveness. SAMHSA recognizes DBT as a structured, intensive, evidence-based approach that requires significant clinician training to deliver with fidelity. (SAMHSA)

Behavioral Therapies for Addiction

For substance use disorders involving stimulants or cannabis — where no FDA-approved medications currently exist — behavioral therapies are the primary treatment. (NIDA) These include CBT, contingency management, motivational enhancement therapy, and 12-step facilitation. Behavioral therapies work by modifying attitudes and behaviors related to drug use, helping patients handle stressful situations and triggers, and enhancing the effectiveness of any medications that are part of the treatment plan. Family therapy is particularly effective for young people, helping address the family dynamics and environmental influences that shape substance use patterns. (NIDA)

Therapy for Co-Occurring Disorders (Dual Diagnosis)

A co-occurring disorder — also called a dual diagnosis — is the presence of both a mental health condition and a substance use disorder simultaneously. 1 in 15 U.S. adults lives with this combination, and research is clear that treating each condition in isolation produces worse outcomes than integrated treatment. (NAMI / SAMHSA, 2025)

SAMHSA’s evidence review of integrated dual diagnosis treatment — across eight controlled studies — found that compared to non-integrated approaches, integrated treatment produces: (SAMHSA)

• Reduced substance use
• Improvement in psychiatric symptoms and daily functioning
• Decreased hospitalization rates
• Increased housing stability
• Fewer arrests
• Improved overall quality of life

Effective dual diagnosis therapy addresses both conditions using a single, unified treatment plan rather than separate referrals. The therapeutic relationship, trauma-informed care, and attention to social determinants — housing, employment, and family support — are all components of evidence-based integrated treatment. (SAMHSA Evidence-Based Practices Resource Center)

Medication-Assisted Treatment (MAT)

MAT combines FDA-approved medications with counseling and behavioral therapies to treat substance use disorders. For opioid use disorder, there are three FDA-approved medications: methadone, buprenorphine, and naltrexone. (SAMHSA) For alcohol use disorder, approved medications also exist. These medications reduce withdrawal symptoms and cravings, restore balance to affected brain circuits, and make substance use less rewarding or even aversive — all without being addictive when taken as prescribed. (NIDA)

MAT is most effective when paired with behavioral therapy. Medications alone manage physiological dependence; therapy addresses the psychological patterns, triggers, and social factors that sustain addiction. NIDA emphasizes that addiction treatment should address the whole person — health, family, work, legal, and mental health needs — not only the substance itself. (NIDA)

How Long Does Therapy Take?

Therapy duration varies based on the condition being treated, severity, and individual response. There is no universal timeline — but research consistently shows that longer engagement produces better outcomes, particularly for substance use disorders and trauma. NIDA notes that addiction is a chronic medical condition, and like diabetes or hypertension, it requires ongoing management rather than a one-time cure. (NIDA)

Program Level	Setting	Typical Duration
Inpatient / Residential Detox	24-hour medical supervision	3–14 days (medically guided)
Residential Treatment	Live-in therapeutic program	30–90 days
PHP	Day program, patient goes home nightly	4–6 weeks (20–30 hrs/week)
IOP	Structured outpatient sessions	8–16 weeks (9–15 hrs/week)
Standard Outpatient Therapy	Weekly or biweekly sessions	Ongoing; often 3–12+ months
MAT Maintenance	Outpatient with medication monitoring	12 months to several years

SAMHSA’s guidance on IOPs notes that when clients are appropriately placed, IOP outcomes are comparable to inpatient treatment at nearly half the cost. (SAMHSA TIP Advisory) Client satisfaction with treatment leads to higher retention, and higher retention leads to better outcomes across all program levels.

How to Access Therapy and What to Expect

Accessing therapy begins with identifying the right level of care for the severity of the condition. SAMHSA’s National Helpline — 1-800-662-4357 — provides free, confidential, 24/7 referral and information for mental health and substance use treatment. (SAMHSA) Most health insurance plans are required to cover mental health and substance use disorder treatment as essential health benefits under the Affordable Care Act and the Mental Health Parity and Addiction Equity Act.

When beginning therapy, NIMH recommends asking a prospective therapist: (NIMH)

• What therapeutic approach will you use, and what is the evidence base for it?
• Do you have experience treating my specific condition and age group?
• What are the goals of treatment, and how will progress be measured?
• What is the expected timeframe or number of sessions?
• What happens if I am not improving?
• Are medications an option, and can you prescribe them?

Rapport and trust are essential to therapeutic outcomes. If progress stalls after a reasonable period, NIMH advises exploring other providers or treatment modalities. (NIMH)

The top barriers Americans report to accessing care are cost (52%) and difficulty finding a provider (42%). (NAMI / Gallup, 2024) Insurance verification before intake, telehealth options, and sliding-scale fee structures can help address both barriers.

Frequently Asked Questions About Therapy

What is the difference between therapy and counseling?

The terms are often used interchangeably, but there are distinctions. Psychotherapy (therapy) typically refers to longer-term, clinical treatment delivered by licensed professionals such as psychologists, licensed clinical social workers, or licensed professional counselors — and it often addresses deep-rooted psychological conditions, trauma, and personality disorders. Counseling often refers to shorter-term, problem-focused support for specific life challenges. For substance use disorders, both individual counseling and formal psychotherapy are classified as behavioral therapies and are the most common forms of SUD treatment. (NIDA)

What type of therapy is most effective for addiction?

No single therapy type is universally “best” — the most effective approach depends on the substance, co-occurring conditions, and the individual. That said, CBT is the most extensively researched behavioral therapy for addiction and is recommended by NIDA because it directly addresses the thoughts and cues that trigger substance use. Contingency management shows strong evidence particularly for stimulant use disorders. Motivational Enhancement Therapy (MET) is effective in the early stages of treatment. For opioid use disorder, MAT combined with behavioral therapy produces the best clinical outcomes. (NIDA)

How do I know if therapy is working?

Progress in therapy is measured by symptom reduction, improved daily functioning, and the ability to manage stressors that previously triggered distress or substance use. Therapists use standardized assessment tools to track outcomes at regular intervals. NIMH advises that if you do not feel you are improving after a reasonable period of time, you should discuss it openly with your therapist and, if necessary, explore other treatment providers or modalities. (NIMH) Retention in treatment is itself a positive predictor — clients who stay engaged consistently show better outcomes. (SAMHSA)

Can therapy treat both mental health conditions and addiction at the same time?

Yes — and for people with co-occurring disorders, it should. SAMHSA’s evidence base confirms that integrated treatment (treating both conditions simultaneously within one unified care plan) outperforms non-integrated treatment across every major outcome category: substance use, psychiatric symptoms, hospitalization, housing stability, and quality of life. (SAMHSA) Treating only the addiction while ignoring the underlying mental health condition — or vice versa — significantly increases relapse risk and reduces long-term recovery rates.

Is online or telehealth therapy as effective as in-person therapy?

For many conditions, research supports that telehealth-delivered therapy produces outcomes comparable to in-person care. SAMHSA recognizes both synchronous (live video) and asynchronous telehealth tools as evidence-supported delivery methods for behavioral health treatment, noting their particular value in removing geographic and access barriers. (SAMHSA) Telehealth is not appropriate for all patients or all levels of care — individuals requiring medical detoxification or residential treatment need in-person, supervised settings. A clinician assessment determines the appropriate format.

Does insurance cover mental health therapy?

In most cases, yes. Mental health and substance use disorder treatment are essential health benefits under the Affordable Care Act, meaning all individual and small-group insurance plans must cover them. The Mental Health Parity and Addiction Equity Act requires that insurers not impose more restrictive coverage limits on mental health or SUD benefits than on comparable medical or surgical benefits. However, coverage details vary by plan — deductibles, copays, in-network requirements, and prior authorization rules differ. Verifying your specific benefits before beginning treatment prevents surprises. (SAMHSA)

What is the difference between inpatient and outpatient therapy?

Inpatient therapy (residential treatment) requires the patient to live at the treatment facility for the duration of care — typically 30 to 90 days — providing 24-hour medical supervision, structured programming, and an environment removed from substance-use triggers. Outpatient therapy allows patients to live at home while attending scheduled treatment sessions — ranging from standard weekly therapy to intensive outpatient programs (IOPs) with 9–15 hours of structured treatment per week. SAMHSA notes that when patients are appropriately matched to outpatient care, IOP outcomes are comparable to inpatient outcomes at significantly lower cost. (SAMHSA TIP Advisory) The right level of care is determined by clinical assessment of medical need, social supports, and addiction severity.

Summary: Therapy is a structured, evidence-based clinical process that addresses mental illness, addiction, trauma, and co-occurring disorders through individualized treatment plans — combining behavioral therapies like CBT and DBT, medication-assisted treatment where indicated, and integrated care for dual diagnosis — with outcomes supported by decades of research from NIMH, NIDA, and SAMHSA.

If you or someone you care about is navigating mental health challenges, addiction, or a dual diagnosis, professional support makes a measurable difference. Worthy Wellness Center in Carlsbad, California offers evidence-based therapy across a full continuum of care — from PHP and IOP to outpatient counseling and holistic treatment — tailored to each individual’s needs. Verify your insurance online or call (833) 822-4203 to speak with a specialist.