Mental Health Glossary: 30 Terms Worth Knowing

Why Mental Health Vocabulary Matters

Being able to name what you or someone close to you is experiencing is a meaningful first step. Mental health terminology is not reserved for clinicians — it is a practical literacy skill that helps people describe symptoms accurately, understand a diagnosis, participate meaningfully in treatment, and reduce stigma through clearer communication.

This reference covers 30 terms drawn from clinical practice, research literature, and everyday mental health conversations. Each is explained in plain language. For a broader foundation, see the complete overview of mental wellness, which covers core concepts alongside everyday practice strategies.

Core Clinical and Diagnostic Terms

These terms appear frequently in clinical settings, treatment plans, and public health materials.

• Diagnosis: A clinical label assigned by a qualified professional based on a defined set of symptoms and criteria — most commonly referenced in the DSM-5-TR in the US or the ICD-11 globally.
• Symptom: A subjective experience reported by an individual (e.g., persistent sadness, racing thoughts) that may indicate an underlying condition.
• Disorder: A clinically significant pattern of behavior or internal experience associated with distress or functional impairment. The word 'disorder' does not imply moral failing or permanent limitation.
• Comorbidity: See the glossary below for a full definition. In brief, it refers to two or more conditions occurring simultaneously in the same individual.
• Differential Diagnosis: The process a clinician uses to distinguish between conditions that share overlapping symptoms before arriving at a final diagnosis.
• Etiology: The cause or contributing factors behind a condition — which may include genetic, environmental, psychological, and social elements.
• Prognosis: A general forecast of how a condition is likely to progress, based on available research and the individual's circumstances. It is not a guarantee of outcomes.
• Remission: A period in which symptoms significantly decrease or resolve. Some conditions involve cycles of remission and relapse over time.

Therapy, Treatment, and Evidence-Based Practice

Understanding the language of treatment helps people ask better questions and evaluate options more confidently. For a closer look at widely held misconceptions, the article things people get wrong about mental health examines common myths against what research actually shows.

• Cognitive Behavioral Therapy (CBT): A structured, evidence-based form of talk therapy that addresses the relationship between thoughts, feelings, and behaviors. It is among the most extensively researched psychological interventions available.
• Dialectical Behavior Therapy (DBT): Originally developed for borderline personality disorder, DBT combines cognitive-behavioral techniques with mindfulness and focuses heavily on emotional regulation and interpersonal effectiveness.
• Exposure Therapy: A behavioral approach involving gradual, supported confrontation with feared stimuli or situations, used primarily for anxiety and trauma-related conditions.
• Psychoeducation: Defined in the glossary. It is a core element of many treatment plans, helping individuals understand their condition and the rationale behind interventions.
• Therapeutic Alliance: Also defined in the glossary. A strong working relationship with a provider is considered one of the most reliable predictors of positive outcomes across therapy types.
• Adjunctive Treatment: A supplementary intervention used alongside a primary treatment — for example, exercise or sleep hygiene support used alongside psychotherapy.
• Maintenance Therapy: Ongoing treatment after initial symptoms have been controlled, designed to prevent relapse rather than achieve a first response.

This article is for informational purposes only and is not a substitute for professional mental health advice, diagnosis, or treatment. Always consult a qualified clinician for guidance specific to your situation.

Psychological Concepts and Everyday Mental Health Language

These terms appear in both clinical and popular contexts and are useful for understanding your own patterns and conversations around wellbeing. Learning to recognize them can support the kind of self-reflection described in the personal mental health audit.

• Cognitive Distortion: Defined in the glossary. Examples include catastrophizing (assuming the worst), personalization (blaming yourself for things outside your control), and black-and-white thinking.
• Rumination: See the glossary. Distinct from problem-solving, rumination involves dwelling on distress without moving toward resolution.
• Mindfulness: The practice of intentionally attending to the present moment without judgment. It is both a therapeutic technique and a broader skill cultivated through regular practice.
• Neuroplasticity: Defined in the glossary. This concept underpins much of the science behind therapy — the brain can change in response to experience. See also what psychologists say about growth mindset.
• Stress Response: The body's physiological and psychological reaction to a perceived threat or demand, mediated by the autonomic nervous system and hormones like cortisol and adrenaline.
• Coping Strategy: Any behavior, thought process, or action used to manage stress or distress. Strategies are broadly categorized as adaptive (helpful) or maladaptive (harmful over time).
• Locus of Control: A person's general belief about whether outcomes are determined by their own actions (internal locus) or by external forces like luck or others (external locus).
• Self-Efficacy: A person's belief in their capacity to carry out a specific behavior or achieve a goal. Higher self-efficacy is associated with greater persistence and better wellbeing outcomes in research.
• Stigma: Negative attitudes, stereotypes, or discrimination directed at people with mental health conditions. Structural stigma operates at institutional levels; internalized stigma occurs when individuals absorb those negative beliefs about themselves.
• Help-Seeking Behavior: The actions a person takes to obtain support for a mental health concern, including speaking with a friend, contacting a professional, or using a crisis line. Barriers to help-seeking include stigma, cost, and limited access.